test: verify bundled decoders and artifact budgets (#7)

git-subtree-dir: apps/viewer-3d
git-subtree-mainline: 5e10bb1be4
git-subtree-split: a71790070d

.gitignore

@@ -1,4 +1,9 @@
 node_modules/
 dist/
+dist-subpath/
 *.log
 .DS_Store
+.serena/
+.playwright-mcp/
+playwright-report/
+test-results/

LICENSES/MPL-2.0.txt

@@ -0,0 +1,373 @@
+Mozilla Public License Version 2.0
+==================================
+
+1. Definitions
+--------------
+
+1.1. "Contributor"
+    means each individual or legal entity that creates, contributes to
+    the creation of, or owns Covered Software.
+
+1.2. "Contributor Version"
+    means the combination of the Contributions of others (if any) used
+    by a Contributor and that particular Contributor's Contribution.
+
+1.3. "Contribution"
+    means Covered Software of a particular Contributor.
+
+1.4. "Covered Software"
+    means Source Code Form to which the initial Contributor has attached
+    the notice in Exhibit A, the Executable Form of such Source Code
+    Form, and Modifications of such Source Code Form, in each case
+    including portions thereof.
+
+1.5. "Incompatible With Secondary Licenses"
+    means
+
+    (a) that the initial Contributor has attached the notice described
+        in Exhibit B to the Covered Software; or
+
+    (b) that the Covered Software was made available under the terms of
+        version 1.1 or earlier of the License, but not also under the
+        terms of a Secondary License.
+
+1.6. "Executable Form"
+    means any form of the work other than Source Code Form.
+
+1.7. "Larger Work"
+    means a work that combines Covered Software with other material, in 
+    a separate file or files, that is not Covered Software.
+
+1.8. "License"
+    means this document.
+
+1.9. "Licensable"
+    means having the right to grant, to the maximum extent possible,
+    whether at the time of the initial grant or subsequently, any and
+    all of the rights conveyed by this License.
+
+1.10. "Modifications"
+    means any of the following:
+
+    (a) any file in Source Code Form that results from an addition to,
+        deletion from, or modification of the contents of Covered
+        Software; or
+
+    (b) any new file in Source Code Form that contains any Covered
+        Software.
+
+1.11. "Patent Claims" of a Contributor
+    means any patent claim(s), including without limitation, method,
+    process, and apparatus claims, in any patent Licensable by such
+    Contributor that would be infringed, but for the grant of the
+    License, by the making, using, selling, offering for sale, having
+    made, import, or transfer of either its Contributions or its
+    Contributor Version.
+
+1.12. "Secondary License"
+    means either the GNU General Public License, Version 2.0, the GNU
+    Lesser General Public License, Version 2.1, the GNU Affero General
+    Public License, Version 3.0, or any later versions of those
+    licenses.
+
+1.13. "Source Code Form"
+    means the form of the work preferred for making modifications.
+
+1.14. "You" (or "Your")
+    means an individual or a legal entity exercising rights under this
+    License. For legal entities, "You" includes any entity that
+    controls, is controlled by, or is under common control with You. For
+    purposes of this definition, "control" means (a) the power, direct
+    or indirect, to cause the direction or management of such entity,
+    whether by contract or otherwise, or (b) ownership of more than
+    fifty percent (50%) of the outstanding shares or beneficial
+    ownership of such entity.
+
+2. License Grants and Conditions
+--------------------------------
+
+2.1. Grants
+
+Each Contributor hereby grants You a world-wide, royalty-free,
+non-exclusive license:
+
+(a) under intellectual property rights (other than patent or trademark)
+    Licensable by such Contributor to use, reproduce, make available,
+    modify, display, perform, distribute, and otherwise exploit its
+    Contributions, either on an unmodified basis, with Modifications, or
+    as part of a Larger Work; and
+
+(b) under Patent Claims of such Contributor to make, use, sell, offer
+    for sale, have made, import, and otherwise transfer either its
+    Contributions or its Contributor Version.
+
+2.2. Effective Date
+
+The licenses granted in Section 2.1 with respect to any Contribution
+become effective for each Contribution on the date the Contributor first
+distributes such Contribution.
+
+2.3. Limitations on Grant Scope
+
+The licenses granted in this Section 2 are the only rights granted under
+this License. No additional rights or licenses will be implied from the
+distribution or licensing of Covered Software under this License.
+Notwithstanding Section 2.1(b) above, no patent license is granted by a
+Contributor:
+
+(a) for any code that a Contributor has removed from Covered Software;
+    or
+
+(b) for infringements caused by: (i) Your and any other third party's
+    modifications of Covered Software, or (ii) the combination of its
+    Contributions with other software (except as part of its Contributor
+    Version); or
+
+(c) under Patent Claims infringed by Covered Software in the absence of
+    its Contributions.
+
+This License does not grant any rights in the trademarks, service marks,
+or logos of any Contributor (except as may be necessary to comply with
+the notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+No Contributor makes additional grants as a result of Your choice to
+distribute the Covered Software under a subsequent version of this
+License (see Section 10.2) or under the terms of a Secondary License (if
+permitted under the terms of Section 3.3).
+
+2.5. Representation
+
+Each Contributor represents that the Contributor believes its
+Contributions are its original creation(s) or it has sufficient rights
+to grant the rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+This License is not intended to limit any rights You have under
+applicable copyright doctrines of fair use, fair dealing, or other
+equivalents.
+
+2.7. Conditions
+
+Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted
+in Section 2.1.
+
+3. Responsibilities
+-------------------
+
+3.1. Distribution of Source Form
+
+All distribution of Covered Software in Source Code Form, including any
+Modifications that You create or to which You contribute, must be under
+the terms of this License. You must inform recipients that the Source
+Code Form of the Covered Software is governed by the terms of this
+License, and how they can obtain a copy of this License. You may not
+attempt to alter or restrict the recipients' rights in the Source Code
+Form.
+
+3.2. Distribution of Executable Form
+
+If You distribute Covered Software in Executable Form then:
+
+(a) such Covered Software must also be made available in Source Code
+    Form, as described in Section 3.1, and You must inform recipients of
+    the Executable Form how they can obtain a copy of such Source Code
+    Form by reasonable means in a timely manner, at a charge no more
+    than the cost of distribution to the recipient; and
+
+(b) You may distribute such Executable Form under the terms of this
+    License, or sublicense it under different terms, provided that the
+    license for the Executable Form does not attempt to limit or alter
+    the recipients' rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+You may create and distribute a Larger Work under terms of Your choice,
+provided that You also comply with the requirements of this License for
+the Covered Software. If the Larger Work is a combination of Covered
+Software with a work governed by one or more Secondary Licenses, and the
+Covered Software is not Incompatible With Secondary Licenses, this
+License permits You to additionally distribute such Covered Software
+under the terms of such Secondary License(s), so that the recipient of
+the Larger Work may, at their option, further distribute the Covered
+Software under the terms of either this License or such Secondary
+License(s).
+
+3.4. Notices
+
+You may not remove or alter the substance of any license notices
+(including copyright notices, patent notices, disclaimers of warranty,
+or limitations of liability) contained within the Source Code Form of
+the Covered Software, except that You may alter any license notices to
+the extent required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+You may choose to offer, and to charge a fee for, warranty, support,
+indemnity or liability obligations to one or more recipients of Covered
+Software. However, You may do so only on Your own behalf, and not on
+behalf of any Contributor. You must make it absolutely clear that any
+such warranty, support, indemnity, or liability obligation is offered by
+You alone, and You hereby agree to indemnify every Contributor for any
+liability incurred by such Contributor as a result of warranty, support,
+indemnity or liability terms You offer. You may include additional
+disclaimers of warranty and limitations of liability specific to any
+jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+---------------------------------------------------
+
+If it is impossible for You to comply with any of the terms of this
+License with respect to some or all of the Covered Software due to
+statute, judicial order, or regulation then You must: (a) comply with
+the terms of this License to the maximum extent possible; and (b)
+describe the limitations and the code they affect. Such description must
+be placed in a text file included with all distributions of the Covered
+Software under this License. Except to the extent prohibited by statute
+or regulation, such description must be sufficiently detailed for a
+recipient of ordinary skill to be able to understand it.
+
+5. Termination
+--------------
+
+5.1. The rights granted under this License will terminate automatically
+if You fail to comply with any of its terms. However, if You become
+compliant, then the rights granted under this License from a particular
+Contributor are reinstated (a) provisionally, unless and until such
+Contributor explicitly and finally terminates Your grants, and (b) on an
+ongoing basis, if such Contributor fails to notify You of the
+non-compliance by some reasonable means prior to 60 days after You have
+come back into compliance. Moreover, Your grants from a particular
+Contributor are reinstated on an ongoing basis if such Contributor
+notifies You of the non-compliance by some reasonable means, this is the
+first time You have received notice of non-compliance with this License
+from such Contributor, and You become compliant prior to 30 days after
+Your receipt of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+infringement claim (excluding declaratory judgment actions,
+counter-claims, and cross-claims) alleging that a Contributor Version
+directly or indirectly infringes any patent, then the rights granted to
+You by any and all Contributors for the Covered Software under Section
+2.1 of this License shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all
+end user license agreements (excluding distributors and resellers) which
+have been validly granted by You or Your distributors under this License
+prior to termination shall survive termination.
+
+************************************************************************
+*                                                                      *
+*  6. Disclaimer of Warranty                                           *
+*  -------------------------                                           *
+*                                                                      *
+*  Covered Software is provided under this License on an "as is"       *
+*  basis, without warranty of any kind, either expressed, implied, or  *
+*  statutory, including, without limitation, warranties that the       *
+*  Covered Software is free of defects, merchantable, fit for a        *
+*  particular purpose or non-infringing. The entire risk as to the     *
+*  quality and performance of the Covered Software is with You.        *
+*  Should any Covered Software prove defective in any respect, You     *
+*  (not any Contributor) assume the cost of any necessary servicing,   *
+*  repair, or correction. This disclaimer of warranty constitutes an   *
+*  essential part of this License. No use of any Covered Software is   *
+*  authorized under this License except under this disclaimer.         *
+*                                                                      *
+************************************************************************
+
+************************************************************************
+*                                                                      *
+*  7. Limitation of Liability                                          *
+*  --------------------------                                          *
+*                                                                      *
+*  Under no circumstances and under no legal theory, whether tort      *
+*  (including negligence), contract, or otherwise, shall any           *
+*  Contributor, or anyone who distributes Covered Software as          *
+*  permitted above, be liable to You for any direct, indirect,         *
+*  special, incidental, or consequential damages of any character      *
+*  including, without limitation, damages for lost profits, loss of    *
+*  goodwill, work stoppage, computer failure or malfunction, or any    *
+*  and all other commercial damages or losses, even if such party      *
+*  shall have been informed of the possibility of such damages. This   *
+*  limitation of liability shall not apply to liability for death or   *
+*  personal injury resulting from such party's negligence to the       *
+*  extent applicable law prohibits such limitation. Some               *
+*  jurisdictions do not allow the exclusion or limitation of           *
+*  incidental or consequential damages, so this exclusion and          *
+*  limitation may not apply to You.                                    *
+*                                                                      *
+************************************************************************
+
+8. Litigation
+-------------
+
+Any litigation relating to this License may be brought only in the
+courts of a jurisdiction where the defendant maintains its principal
+place of business and such litigation shall be governed by laws of that
+jurisdiction, without reference to its conflict-of-law provisions.
+Nothing in this Section shall prevent a party's ability to bring
+cross-claims or counter-claims.
+
+9. Miscellaneous
+----------------
+
+This License represents the complete agreement concerning the subject
+matter hereof. If any provision of this License is held to be
+unenforceable, such provision shall be reformed only to the extent
+necessary to make it enforceable. Any law or regulation which provides
+that the language of a contract shall be construed against the drafter
+shall not be used to construe this License against a Contributor.
+
+10. Versions of the License
+---------------------------
+
+10.1. New Versions
+
+Mozilla Foundation is the license steward. Except as provided in Section
+10.3, no one other than the license steward has the right to modify or
+publish new versions of this License. Each version will be given a
+distinguishing version number.
+
+10.2. Effect of New Versions
+
+You may distribute the Covered Software under the terms of the version
+of the License under which You originally received the Covered Software,
+or under the terms of any subsequent version published by the license
+steward.
+
+10.3. Modified Versions
+
+If you create software not governed by this License, and you want to
+create a new license for such software, you may create and use a
+modified version of this License if you rename the license and remove
+any references to the name of the license steward (except to note that
+such modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary
+Licenses
+
+If You choose to distribute Source Code Form that is Incompatible With
+Secondary Licenses under the terms of this version of the License, the
+notice described in Exhibit B of this License must be attached.
+
+Exhibit A - Source Code Form License Notice
+-------------------------------------------
+
+  This Source Code Form is subject to the terms of the Mozilla Public
+  License, v. 2.0. If a copy of the MPL was not distributed with this
+  file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular
+file, then You may include the notice in a location (such as a LICENSE
+file in a relevant directory) where a recipient would be likely to look
+for such a notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - "Incompatible With Secondary Licenses" Notice
+---------------------------------------------------------
+
+  This Source Code Form is "Incompatible With Secondary Licenses", as
+  defined by the Mozilla Public License, v. 2.0.

LICENSES/OFL-1.1.txt

@@ -0,0 +1,96 @@
+Copyright (c) 2010, NHN Corporation (http://www.nhncorp.com),
+with Reserved Font Name Nanum, Naver Nanum, NanumGothic, Naver 
+NanumGothic, NanumMyeongjo, Naver NanumMyeongjo, NanumBrush, Naver
+NanumBrush, NanumPen, Naver NanumPen.
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

README.md

@@ -1,125 +1,541 @@
 # dwg-dxf-viewer-sample
 
-**hmwebviewer 형제 폴더**에 분리된 DWG/DXF 2D 뷰어 샘플입니다.
+DWG/DXF 2D viewer module과 다중 포맷 3D viewer sample을 함께 관리하는
+Three.js 기반 npm workspace입니다.
 
-`docs/modules-dwg-dxf.html` 모듈 지도의 카드
-(`acadrust-dwg`, `dxf-parser`, `Viewer2D` …)를 **직접 조합**해 동작하는 독립 프로젝트입니다.
-`hmwebviewer` 저장소 안에 의존하지 않습니다.
+현재 구현은 파일을 브라우저에서 파싱하고 화면에 표시하는 기술 검증용입니다.
+좌표, 단위, 원점, 형상 허용오차, topology와 CAD/BIM 의미 정보의 보존을
+보장하는 운영용 engineering viewer로는 아직 검증되지 않았습니다.
 
-```
-D:\MYCLAUDE_PROJECT\
-  hmwebviewer\              ← 본 제품
-  dwg-dxf-viewer-sample\    ← 이 샘플 (형제)
+## 검토 기준
+
+| 항목 | 내용 |
+|---|---|
+| 기준일 | 2026-07-29 |
+| 기준 commit | `cadbd5fb60d300dbb3fdc891fdbbabfbcd5b9109` |
+| 기준 tree | 위 commit 이후 이 README 변경 포함 |
+| 대상 | `kimminsung/dwg-dxf-viewer-sample` |
+| 참조 | 형제 저장소 `hmwebviewer/README.md`의 분석 구조와 3D asset provenance |
+| 검토 범위 | workspace 구조, 2D/3D 기능, source·test·build 설정, 입력 경계, npm dependency, WASM·font·decoder·fixture license |
+| 기능 판정 | **내부 개발·기능 검증 정확도 및 품질 게이트 무시할 수 있으면 GO** |
+| 외부 배포 판정 | **NO-GO — license·source 제공·asset provenance blocker 존재** |
+
+외부 배포 판정은 기술적인 compliance 준비 상태를 뜻합니다. 법률 자문이 아니며,
+실제 계약·특허·상표와 배포 승인은 조직의 법무·오픈소스 정책으로 확정해야 합니다.
+업무용 프로젝트라기보다 취미용 개발 프로젝트에 가까운 성과물입니다.
+
+## 현재 판정
+
+운영 release에는 format별 정확도 contract, 3D 입력 제한·cancellation·Worker 격리,
+프로젝트 license, MPL source 제공, third-party 고지와 sample provenance blocker가
+남아 있습니다. 특히 “상업 사용 가능한 dependency”와 “현재 artifact를 조건 없이
+상업 배포할 수 있음”은 같은 뜻이 아닙니다.
+
+
+## Workspace 구성
+
+| Workspace | 역할 | 주요 runtime |
+|---|---|---|
+| `apps/viewer-2d-sample` | DWG/DXF sample UI와 입력 정책 | `@hmwebviewer/viewer2d`, Three.js |
+| `packages/viewer2d` | 재사용 가능한 2D parser·renderer module | `dxf-parser`, `opentype.js`, Three.js peer, acadrust WASM |
+| `apps/viewer-3d` | 다중 포맷 3D static web application | Three.js, `web-ifc` |
+
+```text
+dwg-dxf-viewer-sample/
+├─ apps/
+│  ├─ viewer-2d-sample/   # 2D sample application
+│  └─ viewer-3d/          # 3D sample application과 offline 도구
+├─ packages/
+│  └─ viewer2d/           # 2D public module
+├─ tests/                 # Vitest와 Playwright
+├─ LICENSES/              # 현재 MPL-2.0, OFL-1.1 전문
+├─ THIRD_PARTY_NOTICES.md
+└─ docs/PROVENANCE.md
 ```
 
----
+세 workspace는 `"private": true`이며 npm registry 배포용 package가 아닙니다.
+`@hmwebviewer/viewer2d`의 export도 현재 TypeScript source를 직접 가리키므로,
+독립 배포 package가 아니라 이 workspace 안에서 재사용하는 module입니다.
 
-## 실행
+## 현재 제공 기능
+
+### DWG/DXF 2D viewer
+
+- `.dwg`, `.dxf` URL과 로컬 파일 load
+- 파일 선택, Drag & Drop, `?model=<url>` 진입 경로
+- DWG는 acadrust WebAssembly parser, DXF는 `dxf-parser`와 adapter 사용
+- Three.js orthographic renderer와 pan·zoom
+- Zoom Fit, dark/light theme, layer별 표시·숨김
+- entity click 선택과 type·layer·handle 표시
+- TEXT/MTEXT glyph용 NanumGothic TTF load
+- module API의 grid, zoom speed, view-change 구독, entity/block 통계,
+  WebP snapshot, 2점 거리 측정, accent color
+- page 종료 시 RAF, listener, WebGL resource와 canvas dispose
+
+renderer에는 LINE, CIRCLE, ARC, ELLIPSE, POINT, POLYLINE/LWPOLYLINE,
+SPLINE, TEXT/MTEXT/ATTRIB, INSERT, HATCH, DIMENSION, LEADER, XLINE/RAY 등
+여러 entity 경로가 있습니다. 모든 DWG/DXF version과 entity 조합의 정확도를
+보장한다는 의미는 아닙니다.
+
+2D 입력 경계는 application layer에서 다음과 같이 제한합니다.
+
+- URL은 HTTP(S)와 viewer 동일 origin만 허용
+- `Content-Length`와 streaming 누적 크기를 모두 확인
+- 로컬·URL 입력 최대 50 MiB
+- URL fetch timeout 15초
+
+### 다중 포맷 3D viewer
+
+- `?model=<url>` server asset load와 로컬 Drag & Drop
+- GLB, GLTF, OBJ, FBX, DAE, IFC, PLY load
+- OBJ와 함께 드롭한 MTL 및 PNG/JPEG/BMP/GIF/WebP/TGA texture 연결
+- 300 MiB 초과 OBJ의 2-pass streaming parser
+- 큰 절대 좌표를 가진 OBJ의 float64 source 단계 재중심화
+- Draco geometry와 KTX2/Basis texture runtime decode
+- IFC single-thread WebAssembly parse와 geometry 변환
+- PLY mesh·point cloud 처리 및 Float64 attribute의 Float32 정규화
+- OrbitControls, Zoom Fit, 원근·직교 projection, outline 표시
+- FPS overlay와 지속적인 저 FPS에서 pixel ratio를 낮추는 adaptive quality
+- model URL과 이름이 같은 360° WebP preview를 먼저 표시한 뒤 canvas로 전환
+- Vite `BASE_URL`을 따르는 decoder·preview 경로와 subpath 배포
+- 교체 model의 geometry·material·texture와 Blob URL 정리
+
+WebP preview는 미리 생성된 정적 파일입니다. Vite가 HTML shell을 제공한 뒤
+브라우저에서 preview와 model을 load하므로 server-side 3D rendering 또는 SSR
+구현은 없습니다.
+
+## 실행 구조
+
+```mermaid
+flowchart TD
+    A["2D File / same-origin URL"] --> B["cadInputPolicy"]
+    B --> C["parseCad"]
+    C --> D["acadrust WASM<br/>DWG"]
+    C --> E["dxf-parser + adapter<br/>DXF"]
+    D --> F["CadParseResult"]
+    E --> F
+    F --> G["Viewer2D / Three.js"]
+
+    H["3D File / ?model URL"] --> I["ThreeDViewer"]
+    I --> J["modelLoader"]
+    J --> K["Three.js format loaders"]
+    J --> L["web-ifc JS + WASM"]
+    K --> M["THREE.Object3D"]
+    L --> M
+    M --> N["WebGLRenderer"]
+```
+
+2D application은 `packages/viewer2d` 내부 파일을 직접 import하지 않고
+`@hmwebviewer/viewer2d` public interface를 사용합니다. 3D `modelLoader`는
+확장자로 loader를 선택하고 결과를 `THREE.Object3D`로 정규화합니다.
+
+Three.js의 Draco·Basis decoder는 loader import가 생성하는 version 일치 Vite
+hashed asset을 사용합니다. `npm ci`의 root `postinstall`은 현재 code path가
+사용하는 single-thread `web-ifc.wasm`만 `apps/viewer-3d/public/web-ifc` 아래에
+staging합니다. COOP/COEP가 필요한 `web-ifc-mt.wasm`은 배포하지 않습니다.
+
+## 지원 범위와 알려진 제한
+
+### 2D
+
+| 포맷 | URL | 로컬 파일 | 현재 검증과 제한 |
+|---|---:|---:|---|
+| DWG | 동일 origin 지원 | 지원 | `BasicSample.dwg` 1개 fixture 중심. acadrust WASM wrapper의 재현 build source가 없음 |
+| DXF | 동일 origin 지원 | 지원 | `simple.dxf`와 public parser contract 검증. binary DXF 및 전체 entity fidelity 미검증 |
+
+### 3D
+
+| 포맷 | `?model` URL | 로컬 파일 | 알려진 제한 |
+|---|---:|---:|---|
+| GLB | 지원 | 지원 | Draco/KTX2 지원. 손실 압축 허용오차와 원본 대비 fidelity 기준 없음 |
+| GLTF | 지원 | 제한적 | 로컬 `.bin`·texture sidecar를 함께 해석하는 file-set session 없음 |
+| OBJ | 지원 | 지원 | URL 경로의 MTL 자동 load 없음. 로컬만 MTL·texture sidecar 지원 |
+| OBJ > 300 MiB | 제한적 | 지원 | URL에는 size 기반 streaming 분기가 없음. 로컬 streaming path는 smooth normal과 MTL `Kd` color만 사용하고 texture·hard edge fidelity를 포기 |
+| FBX | 지원 | 지원 | 축·단위·animation·외부 texture 보존 계약 없음 |
+| DAE | 지원 | 제한적 | 로컬 외부 texture sidecar 미지원 |
+| IFC | 지원 | 지원 | geometry와 color만 Three.js object로 변환. property/semantic API와 원점 이동 기록 미보존 |
+| PLY | 지원 | 지원 | mesh 또는 point cloud. double attribute는 GPU용 Float32로 변환되어 정밀도 손실 가능 |
+
+여기서 “지원”은 sample을 파싱해 renderable object를 만들 수 있다는 뜻입니다.
+CAD/BIM 원본과의 좌표·단위·원점·topology·재질·속성 일치를 의미하지 않습니다.
+
+## 신뢰 경계와 운영 위험
+
+2D 경로는 same-origin, 50 MiB, 15초 제한을 적용하지만 magic bytes, MIME,
+압축 해제 후 entity 수와 geometry 복잡도 quota는 없습니다.
+
+3D `?model`은 URL scheme·origin·크기·timeout을 제한하지 않습니다. browser CORS가
+허용하면 외부 origin도 요청할 수 있고, GLTF/DAE/FBX/OBJ가 참조하는 URI가 추가
+network request를 만들 수 있습니다. 로컬 3D 파일에도 최대 크기와 decode 후
+vertex·texture·memory quota가 없습니다.
+
+두 viewer 모두 parser와 상당한 geometry 처리를 browser main thread에서 수행합니다.
+운영 배포에는 format별 Worker 격리, URL allowlist, CSP, MIME·signature 검사,
+streaming byte limit, decode complexity quota, timeout과 cancellation이 필요합니다.
+
+동시에 여러 load를 시작했을 때 이전 요청을 취소하거나 latest-wins를 보장하는
+session 규약도 없습니다. 느린 이전 요청이 나중 요청 뒤에 완료되어 화면을
+덮을 수 있습니다.
+
+현재 E2E는 sample render, finite vertex, canvas lifecycle과 subpath decoder URL을
+검사합니다. 공식 validator, golden geometry, 좌표·단위 왕복, topology,
+material·IFC property contract와 장시간 memory soak는 release gate에 없습니다.
+
+## 외부 의존성·라이선스 감사
+
+> **배포 준비 판정: 외부 demo·고객 전달·public CDN·commercial SaaS `NO-GO`,
+> 조직 내부 개발·검증 조건부 `GO`**
+>
+> dependency 자체는 대부분 상업 사용 가능한 license이지만, 프로젝트 소유 코드의
+> license, MPL source 제공, Apache/MIT 고지와 sample provenance가 완결되지 않았습니다.
+
+감사 범위는 `package-lock.json`의 `node_modules/*` entry, 실제 browser bundle,
+`public` 정적 파일, bundled WASM·font, sample과 파생 preview, repository가
+호출하거나 언급하는 system tool입니다.
+
+lockfile에는 142개 `node_modules/*` entry가 있습니다. 이 중 3개는 이 저장소의
+workspace link이고 제3자 package는 139개입니다. 제3자 entry의 license metadata
+누락은 0개입니다. runtime entry는 5개, build/dev entry는 134개이며 그중 57개는
+platform별 optional package입니다.
+
+### Browser runtime과 직접 배포되는 구성요소
+
+| 구성요소 | 버전·출처 | 역할·배포 위치 | License | 현재 compliance 상태 |
+|---|---|---|---|---|
+| Three.js | `0.185.1` | 두 viewer의 JS bundle, loader·controls | MIT | package license는 확인. 배포 artifact에 통합 MIT notice 없음 |
+| dxf-parser | `1.1.2` | DXF parser JS bundle | MIT | package license는 확인. 통합 notice 없음 |
+| loglevel | `1.9.2`, `dxf-parser` transitive | DXF runtime logging | MIT | lockfile·package license 확인 |
+| opentype.js | `2.0.0` | TTF glyph 처리 JS bundle | MIT | package license는 확인. 통합 notice 없음 |
+| acadrust | WASM 내부 `0.4.1` | `acadrust_dwg_bg.wasm`, DWG parse | MPL-2.0 | MPL 전문과 checksum은 있음. wrapper source·toolchain과 재현 build가 없음 |
+| NanumGothic | Google Fonts 원본 checksum 일치 | `NanumGothic-Regular.ttf` | OFL-1.1 | 전문과 checksum은 있음. root license 파일이 app dist에는 자동 포함되지 않음 |
+| web-ifc | `0.0.77` | dynamic JS bundle, `/web-ifc/*.wasm` | MPL-2.0 | package 전문은 확인. exact covered source 취득 안내가 배포물에 없음 |
+| Draco decoder | Three.js r185 배포본 | Vite `/assets/draco_*` hashed asset | Apache-2.0 | 설치된 Three.js source에서 build. Apache 전문·NOTICE가 app dist에 없음 |
+| Basis Universal transcoder | Three.js r185 배포본 | Vite `/assets/basis_*` hashed asset | Apache-2.0 | 설치된 Three.js source에서 build. Apache 전문·NOTICE가 app dist에 없음 |
+
+저장소의 [`THIRD_PARTY_NOTICES.md`](./THIRD_PARTY_NOTICES.md)는 acadrust,
+NanumGothic과 주요 runtime library를 기록하고, [`LICENSES/`](./LICENSES/)에는
+MPL-2.0과 OFL-1.1 전문이 있습니다. 그러나 이 파일들은 두 Vite application의
+`public` 아래에 있지 않아 현재 `npm run build` 결과에는 포함되지 않습니다.
+
+### 전체 npm license 집계
+
+| License | 제3자 package entry 수 | 주 사용 범위 | 상업 사용 | source 공개 영향 |
+|---|---:|---|---:|---|
+| MIT | 86 | runtime 4개와 build/dev | 가능 | 프로젝트 source 공개 의무 없음. copyright·license notice 보존 |
+| Apache-2.0 | 31 | TypeScript, Playwright, Puppeteer와 platform package | 가능 | 프로젝트 source 공개 의무 없음. license·변경·NOTICE·patent 조건 적용 |
+| MPL-2.0 | 13 | `web-ifc` runtime 1개, Lightning CSS 계열 dev 12개 | 가능 | 외부 executable 배포 시 covered source와 취득 안내 필요 |
+| ISC | 6 | build/dev | 가능 | copyright·permission notice 보존 |
+| BSD-3-Clause | 2 | build/dev | 가능 | notice·면책 보존, 이름을 홍보에 사용하지 않음 |
+| 0BSD | 1 | optional build/dev | 가능 | source 공개와 attribution 의무 없음 |
+
+위 집계에는 npm 밖의 acadrust WASM, NanumGothic, Draco, Basis와 sample asset
+license가 포함되지 않습니다. `UNKNOWN` 3개처럼 보이는 lockfile entry는
+`@hmwebviewer/*` first-party workspace link이며 제3자 license 누락이 아닙니다.
+
+#### MPL-2.0 npm package 전체 목록
+
+`package-lock.json`에서 `license: "MPL-2.0"`으로 선언된 13개 entry를 전부
+나열하면 다음과 같습니다. 이는 **13개의 독립 codebase**를 의미하지 않습니다.
+`web-ifc` 1개와, 동일한 Lightning CSS source에서 배포되는 core package 1개 및
+platform별 optional native package 11개로 구성됩니다.
+
+| npm package | Version | 설치·실행 범위 | 공식 source repository |
+|---|---:|---|---|
+| `web-ifc` | `0.0.77` | production runtime. IFC parser JS가 bundle되고 single-thread WASM이 application public asset으로 staging됨 | [ThatOpen/engine_web-ifc](https://github.com/ThatOpen/engine_web-ifc) |
+| `lightningcss` | `1.33.0` | Vite build dependency. CSS parse·transform·minify core와 현재 platform용 native binding 선택 | [parcel-bundler/lightningcss v1.33.0](https://github.com/parcel-bundler/lightningcss/tree/v1.33.0) |
+| `lightningcss-android-arm64` | `1.33.0` | optional dev package, Android ARM64 native binding | [parcel-bundler/lightningcss v1.33.0](https://github.com/parcel-bundler/lightningcss/tree/v1.33.0) |
+| `lightningcss-darwin-arm64` | `1.33.0` | optional dev package, macOS ARM64 native binding | [parcel-bundler/lightningcss v1.33.0](https://github.com/parcel-bundler/lightningcss/tree/v1.33.0) |
+| `lightningcss-darwin-x64` | `1.33.0` | optional dev package, macOS x86_64 native binding | [parcel-bundler/lightningcss v1.33.0](https://github.com/parcel-bundler/lightningcss/tree/v1.33.0) |
+| `lightningcss-freebsd-x64` | `1.33.0` | optional dev package, FreeBSD x86_64 native binding | [parcel-bundler/lightningcss v1.33.0](https://github.com/parcel-bundler/lightningcss/tree/v1.33.0) |
+| `lightningcss-linux-arm-gnueabihf` | `1.33.0` | optional dev package, Linux ARM hard-float GNU native binding | [parcel-bundler/lightningcss v1.33.0](https://github.com/parcel-bundler/lightningcss/tree/v1.33.0) |
+| `lightningcss-linux-arm64-gnu` | `1.33.0` | optional dev package, Linux ARM64 glibc native binding | [parcel-bundler/lightningcss v1.33.0](https://github.com/parcel-bundler/lightningcss/tree/v1.33.0) |
+| `lightningcss-linux-arm64-musl` | `1.33.0` | optional dev package, Linux ARM64 musl native binding | [parcel-bundler/lightningcss v1.33.0](https://github.com/parcel-bundler/lightningcss/tree/v1.33.0) |
+| `lightningcss-linux-x64-gnu` | `1.33.0` | optional dev package, Linux x86_64 glibc native binding. 현재 표준 container 대상 | [parcel-bundler/lightningcss v1.33.0](https://github.com/parcel-bundler/lightningcss/tree/v1.33.0) |
+| `lightningcss-linux-x64-musl` | `1.33.0` | optional dev package, Linux x86_64 musl native binding | [parcel-bundler/lightningcss v1.33.0](https://github.com/parcel-bundler/lightningcss/tree/v1.33.0) |
+| `lightningcss-win32-arm64-msvc` | `1.33.0` | optional dev package, Windows ARM64 MSVC native binding | [parcel-bundler/lightningcss v1.33.0](https://github.com/parcel-bundler/lightningcss/tree/v1.33.0) |
+| `lightningcss-win32-x64-msvc` | `1.33.0` | optional dev package, Windows x86_64 MSVC native binding | [parcel-bundler/lightningcss v1.33.0](https://github.com/parcel-bundler/lightningcss/tree/v1.33.0) |
+
+Lightning CSS의 12개 entry는 모두 동일한 MPL-2.0 source tree와 release version을
+가리키지만 lockfile 및 SBOM에서는 서로 다른 배포 package로 유지합니다. 실제 install
+시 npm은 host OS·CPU·libc와 맞는 optional binding만 선택합니다. 이 project의
+production browser artifact에는 Lightning CSS code가 포함되지 않지만, build
+container 또는 `node_modules`를 제3자에게 전달한다면 선택된 binding과 covered
+source 제공 방법을 함께 관리해야 합니다.
+
+`web-ifc@0.0.77` package가 선언한 공식 repository는 위 root URL이며 package
+metadata에는 exact source commit(`gitHead`)이 없습니다. 따라서 외부 배포 전에
+registry tarball과 대응하는 source commit/archive를 별도로 고정하고, 수정 여부와
+covered source 취득 방법을 배포 고지에 기록해야 합니다.
+
+### Build·test·offline 도구
+
+| 구성요소 | lockfile 기준 | 역할 | License·배포 판단 |
+|---|---:|---|---|
+| Vite | `8.1.5` | dev server와 production build | MIT. build output에는 runtime third-party notice를 별도로 넣어야 함 |
+| TypeScript | `7.0.2` | typecheck | Apache-2.0. compiler를 고객에게 함께 전달하지 않으면 제품 source 공개 영향 없음 |
+| Vitest | `4.1.10` | unit test | MIT, 제품 runtime 아님 |
+| Playwright | `1.62.0` | browser E2E | Apache-2.0, 제품 runtime 아님 |
+| Puppeteer Core | `25.4.0` resolved | 3D smoke·preview capture | Apache-2.0. Chrome binary를 포함하지 않음 |
+| Lightning CSS | `1.33.0` 계열 12 entry | Vite build transitive | MPL-2.0. build host에서만 사용하며 browser runtime에는 포함되지 않음 |
+| Node.js·npm | Node >=24, npm >=11 요구 | install, build, tool runtime | 함께 재배포하면 각 runtime과 bundled dependency license를 별도 감사 |
+| Chrome | system executable | Playwright/Puppeteer 실행 | repository가 bundle하지 않음. CI image·설치형 배포에 포함하면 vendor 조건 별도 검토 |
+| ffmpeg | optional, lockfile 밖 | PNG frame을 animated WebP로 결합 | binary를 bundle할 때 실제 build option의 LGPL/GPL/nonfree 조건 확인 |
+| KTX-Software `toktx` | 도입 안내만 존재 | 선택적 KTX2 encoding | 현재 dependency가 아님. 도입 시 exact binary BOM과 license 재검토 |
+
+`apps/viewer-3d/tools/preprocess.mjs`는 `@gltf-transform/core`,
+`@gltf-transform/functions`, `@gltf-transform/extensions`, `draco3d`를 import하지만
+현재 `package.json`과 lockfile에는 이 package들이 없습니다. 따라서 clean install의
+정식 toolchain으로 재현되지 않습니다.
+
+현재 script가 구현한 texture output은 WebP/JPEG/PNG이며 KTX2 encoding은 하지
+않습니다. KTX2는 별도 glTF Transform CLI와 `toktx`가 필요합니다.
+하위 `tools/README.md`의 “KTX2 default” 설명은 현재 code와 일치하지 않습니다.
+
+### MPL·Apache·OFL 적용 범위
+
+MPL-2.0은 file-level copyleft입니다. 별도 파일로 결합한 이 application 전체를
+MPL로 공개할 필요는 없지만, 조직 밖으로 browser JS/WASM executable을 전달하면
+수령자가 해당 MPL covered source와 수정분을 합리적인 방법으로 얻을 수 있게
+알려야 합니다. browser로 전송되는 client code도 배포에 해당합니다.
+
+- `web-ifc@0.0.77`: exact source archive 또는 고정 commit/tag URL과 수정 여부,
+  build 가능한 covered source 취득 안내가 필요
+- acadrust DWG WASM: crate source만으로는 현재 binary wrapper를 재현할 수 없으므로
+  wrapper source·Cargo/wasm-bindgen 설정·toolchain을 복구하기 전 외부 배포 보류
+- Lightning CSS: `node_modules`나 build container를 외부에 전달하지 않고 build
+  host에서만 실행하면 application source 공개 범위를 만들지 않음
+
+Apache-2.0의 Draco와 Basis는 source 공개 의무는 없지만 license 사본, 기존
+attribution과 upstream NOTICE, 수정 시 변경 고지를 보존해야 합니다. OFL font는
+software와 bundle할 수 있지만 copyright와 OFL 전문을 함께 제공해야 하며,
+Reserved Font Name 조건을 지켜야 합니다.
+
+참조:
+
+- [Mozilla MPL 2.0 FAQ](https://www.mozilla.org/en-US/MPL/2.0/FAQ/)
+- [acadrust upstream](https://github.com/hakanaktt/acadrust)
+- [web-ifc upstream](https://github.com/ThatOpen/engine_web-ifc)
+- [Three.js r185 MIT license](https://github.com/mrdoob/three.js/blob/r185/LICENSE)
+- [Google Draco Apache-2.0 license](https://github.com/google/draco/blob/main/LICENSE)
+- [Basis Universal](https://github.com/BinomialLLC/basis_universal)
+- [NanumGothic OFL](https://github.com/google/fonts/blob/main/ofl/nanumgothic/OFL.txt)
+
+### Sample asset과 파생 preview
+
+Sample과 preview는 software dependency license와 별개의 저작물입니다.
+optimized model과 회전 preview도 원본 asset의 license·attribution·변경 표시를
+계승해야 합니다.
+
+| 자산 | 확인된 출처·license | 현재 판단 |
+|---|---|---|
+| `BasicSample.dwg` | 2D standalone initial commit에서 이관, 원출처 불명 | 내부 회귀 test 전용. 외부 demo 배포 보류 |
+| `simple.dxf` | 2D standalone initial commit의 최소 fixture | 권리자·license 명시가 없어 외부 재배포 승인 필요 |
+| `Box.glb` | Khronos sample, Cesium 제공, CC BY 4.0 | 상업 사용 가능하나 Cesium attribution, license link와 변경 여부 고지가 현재 배포물에 없음 |
+| `Duck.glb` | Copyright 2006 Sony Computer Entertainment Inc., SCEA Shared Source License 1.0 | 비표준 license. 내부 법무 승인 전 외부 배포 보류 |
+| `Duck.optimized.glb`, `Duck.webp` | Duck의 Draco/WebP·preview 파생물 | 원본 SCEA 승인과 derivative 변경 표시에 종속 |
+| `Cube.obj`, `Cube.dae`, `Cube.ifc`, `DoublePrecision.ply` | 파일·commit에 hand-authored/project fixture 정황 | 프로젝트 권리자와 first-party license가 선언되지 않아 외부 배포 보류 |
+| `Cube.fbx`, `sample.mtl` | history에는 Three.js `morph_test`와 Blender 정황만 있고 exact 원본 URL·asset license 없음 | provenance 복구 또는 제거 전 외부 배포 보류 |
+| `Cube.*.webp` | 각 Cube model에서 생성한 24-frame preview | 원본 model의 권리·license와 변경 표시에 종속 |
+
+Box와 Duck의 upstream license:
+
+- [Khronos Box — CC BY 4.0](https://github.com/KhronosGroup/glTF-Sample-Models/blob/main/2.0/Box/README.md)
+- [Khronos Duck — SCEA Shared Source License 1.0](https://github.com/KhronosGroup/glTF-Sample-Models/blob/main/2.0/Duck/README.md)
+
+fixture checksum과 source history는 [`docs/PROVENANCE.md`](./docs/PROVENANCE.md),
+acadrust·font checksum은 [`THIRD_PARTY_NOTICES.md`](./THIRD_PARTY_NOTICES.md)를
+기준으로 관리합니다. 현재 provenance 문서는 2D fixture 중심이며 3D asset과
+preview derivative chain은 아직 통합되지 않았습니다.
+
+### 프로젝트 license와 외부 release gate
+
+루트에는 프로젝트 소유 코드에 적용되는 `LICENSE`와 copyright holder 선언이
+없습니다. `package.json`의 `"private": true`는 npm publish 방지 설정일 뿐
+외부 이용·수정·재배포 권한을 부여하지 않습니다. 하위 과거 README의
+“Viewer2D 포트·샘플 글루 MIT” 문구도 현재 repository의 license grant로 볼 수
+없습니다.
+
+다음 조건을 완료하기 전에는 외부 demo, 고객 전달, 설치형 package, public CDN과
+commercial SaaS 배포를 승인하지 않습니다.
+
+- 프로젝트 소유 코드의 권리자와 proprietary/open-source license 결정
+- 2D·3D build artifact에 runtime `THIRD_PARTY_NOTICES`와 필요한 license 전문 포함
+- acadrust wrapper source·toolchain 복구와 exact WASM 재현 build
+- acadrust 및 `web-ifc@0.0.77` covered source의 고정 archive/URL과 취득 안내 제공
+- Draco·Basis Apache license와 upstream NOTICE 보존
+- Box attribution과 sample별 원본 URL·권리자·license·checksum·derivative chain 기록
+- Duck의 내부 법무 승인 또는 승인된 CC0/CC BY asset으로 교체
+- `BasicSample.dwg`, `Cube.fbx`, `sample.mtl` 등 출처 미완료 fixture의 승인 또는 제거
+- runtime/build/sample을 구분한 SBOM과 CI의 unknown-license/provenance gate
+
+
+## 개발 스택 및 구성 정책
+
+이 저장소의 표준 개발 대상은 **Linux x86_64 container**입니다. Windows host에서는
+Docker Desktop 또는 WSL2를 container runtime 진입점으로만 사용하며, Windows drive
+path와 host의 `node_modules`를 표준 build 입력으로 사용하지 않습니다.
+
+| 구분 | 표준 stack | 구성 정책 |
+|---|---|---|
+| Host·container | Linux x86_64, glibc 기반 image | Chrome과 native npm package 호환성이 확인될 때까지 Debian/Ubuntu 계열을 기준으로 하며 Alpine/musl은 별도 검증 없이 사용하지 않음 |
+| JavaScript runtime | Node.js 24 이상, npm 11 이상 | `package.json#engines`가 지원 하한이며 container와 CI에서는 24.x·11.x의 exact version 및 base image digest를 고정 |
+| Package 관리 | npm workspaces, `package-lock.json` | clean environment는 `npm ci`만 사용하고 lockfile을 canonical dependency graph로 취급하며 host `node_modules`를 container에 mount하지 않음 |
+| Application | Vite 8, TypeScript 7, Three.js r185 | `apps/*`는 실행 application, `packages/*`는 workspace 내부 module로 유지하며 browser runtime asset은 Vite `BASE_URL`을 따름 |
+| Unit·contract test | Vitest 4 | root `tests/**/*.test.ts`를 기준으로 하고 변경 시 관련 test부터 실행한 뒤 전체 suite를 실행 |
+| Browser E2E | Playwright 1.62, system Chrome/Chromium | browser binary와 Linux system library를 E2E image에 고정하고 `PLAYWRIGHT_CHROMIUM_EXECUTABLE`로 경로를 주입 |
+| Runtime decoder | acadrust DWG WASM, Draco, Basis, web-ifc | Draco·Basis는 Three.js import의 hashed asset을 사용하고 `postinstall`은 single-thread `web-ifc.wasm`만 staging함 |
+| Optional asset tool | Puppeteer Core, ffmpeg, Blender, `toktx` | application build의 필수 dependency가 아니며 별도 asset-tool image/profile과 별도 license BOM으로 격리 |
+
+공통 구성 원칙은 다음과 같습니다.
+
+- tracked text file과 shell script는 LF를 사용하고 canonical command는 POSIX shell
+  문법과 repository-relative path로 작성합니다.
+- development, production build, E2E, optional asset processing은 서로 다른
+  container target 또는 profile로 분리합니다. production artifact에 compiler,
+  browser, test 전용 fixture와 asset tool을 포함하지 않습니다. `public/samples`의
+  demo asset은 의도된 runtime content이므로 provenance·license gate를 별도로 적용합니다.
+- container process는 non-root user로 실행하고 source는 read-only mount를
+  우선합니다. `npm ci`의 postinstall decoder staging은 writable image build layer에서
+  끝내고, runtime container에서는 완성된 artifact만 read-only로 제공합니다.
+  dependency cache와 build output만 별도 writable volume을 사용합니다.
+- host에서 직접 실행할 때 Vite는 loopback에만 bind합니다. container에서 port를
+  publish할 때만 container 전용 설정으로 `0.0.0.0`에 bind하고 공개 network에
+  노출하지 않습니다.
+- Node.js, npm, Chrome/Chromium과 base image는 floating tag가 아니라 exact
+  version으로 고정합니다. Renovate 같은 자동 갱신을 사용하더라도 `npm run verify`
+  통과 후에만 lock과 image pin을 갱신합니다.
+- source build/test image와 외부 배포 artifact의 license·provenance gate는
+  동일하지 않습니다. 아래 `외부 의존성·라이선스 감사`의 `NO-GO` 항목을 container
+  전환만으로 해소된 것으로 간주하지 않습니다.
+
+## Linux 컨테이너 전환 검증
+
+2026-07-29 기준 installed dependency 상태에서 typecheck, unit test 8개, production
+build와 Playwright E2E 17개가 Linux/WSL2 x86_64에서 다시 통과했습니다. tracked
+text file은 LF이며 lockfile에는 Linux glibc와 musl용 native optional package가
+포함되어 있습니다. 따라서 application code의 Windows 종속성은 현재 검증 범위에서
+발견되지 않았지만, clean `npm ci`부터 시작하는 재현 가능한 container 개발 환경의
+정의와 검증은 아직 완료되지 않았습니다.
+
+| 항목 | 현재 상태 | container 전환 판단 |
+|---|---|---|
+| Container 정의 | Dockerfile, `.dockerignore`, Compose/devcontainer 없음 | **Blocker** — 동일 image를 개발·CI에서 재현할 수 없음 |
+| Dev server network | 2D·3D Vite가 `127.0.0.1`에 고정 | **Blocker** — container port publish 후 host에서 접근할 별도 bind 설정 필요 |
+| E2E browser | `/usr/bin/google-chrome`을 기본 경로로 가정 | **Blocker** — Chrome/Chromium과 shared library를 image에 설치·고정해야 함 |
+| Native ABI | Linux glibc/musl package가 lockfile에 모두 존재 | **Decision** — 우선 glibc를 baseline으로 고정하고 musl은 별도 test matrix로 검증 |
+| Clean container gate | 현재 container CI 없음 | **Blocker** — clean `npm ci && npm run verify`를 release gate로 추가해야 함 |
+| File·path 규칙 | tracked text는 LF, runtime code는 Node path API 사용 | 통과. 단, 하위 2D README의 Windows drive path는 정리 필요 |
+| Offline asset pipeline | ffmpeg·Blender·`toktx`가 core lockfile 밖에 있음 | core 개발은 통과. asset-tool image와 version/license pin은 후속 작업 |
+
+권장 구현 순서는 다음과 같습니다.
+
+1. Node.js 24 기반 glibc image의 digest와 non-root user를 고정한 multi-stage
+   Dockerfile 및 `.dockerignore`를 추가합니다.
+2. host loopback 기본값은 유지하고 container script에서만 2D `5173`, 3D `3333`
+   port를 `0.0.0.0`에 bind합니다.
+3. Chrome/Chromium과 필요한 Linux library를 포함한 E2E target을 만들고
+   `PLAYWRIGHT_CHROMIUM_EXECUTABLE`을 명시합니다.
+4. container 안에서 `npm ci`, `npm run verify`를 수행하는 CI job을 추가하고
+   host `node_modules`가 섞이지 않는지 확인합니다.
+5. ffmpeg·Blender·`toktx`가 필요한 3D asset pipeline은 별도 image/profile로
+   분리하고 core application image에는 포함하지 않습니다.
+6. `apps/viewer-2d-sample/README.md`의 standalone Windows layout과 실행 명령을
+   현재 npm workspace 및 Linux container 기준으로 갱신합니다.
+
+
+## 설치와 실행
+
+요구 환경은 Node.js 24 이상, npm 11 이상과 WebGL을 지원하는 browser입니다.
 
 ```bash
-cd D:\MYCLAUDE_PROJECT\dwg-dxf-viewer-sample
-npm install
-npm run dev
-# → http://localhost:5173
+npm ci
 ```
 
-| UI | 모듈 경로 |
-|----|-----------|
-| **Sample DWG** | `ext2d` → **acadrust-dwg WASM** → `Viewer2D` |
-| **Sample DXF** | `ext2d` → **dxf-parser + hatch + adapter** → `Viewer2D` |
-| 파일 드롭 / Open | 확장자로 위 둘 중 하나 |
+`npm ci`는 workspace dependency를 설치한 뒤 single-thread IFC WASM을 staging합니다.
+Draco·Basis decoder는 production build가 설치된 Three.js에서 hashed asset으로
+생성합니다.
 
-모듈 지도: 브라우저에서 [`docs/modules-dwg-dxf.html`](./docs/modules-dwg-dxf.html)  
-조합 코드: [`src/main.ts`](./src/main.ts)
+```bash
+npm run dev:2d
+# http://127.0.0.1:5173
 
----
-
-## 레이아웃
-
-```
-dwg-dxf-viewer-sample/
-  docs/modules-dwg-dxf.html   # 모듈 조합 레시피 HTML
-  public/
-    fonts/NanumGothic-Regular.ttf
-    samples/BasicSample.dwg
-    samples/simple.dxf
-  src/
-    main.ts                   # 모듈을 import 해서 조립
-    viewer2d/                 # 재사용 모듈 본체
-      acadrust-dwg/           # WASM
-      Viewer2D.js
-      dwgParser.ts
-      parseDxf.ts
-      dxfAdapter.js
-      dxfHatchHandler.js
-      ext2d.ts
-      slugText.ts
-      …
-  package.json
-  vite.config.ts
+npm run dev:3d
+# http://127.0.0.1:3333
 ```
 
----
+URL load 예시:
 
-## 조합 파이프라인
-
-```
-File/URL
-  → ext2d (isDwg / isDxf)
-  → parseDwgBuffer  |  parseDxfBuffer
-       │                    │
-       └ acadrust-dwg       ├ decodeDxf
-                            ├ dxf-parser + dxfHatchHandler
-                            └ dxfAdapter
-  → CadParseResult
-  → Viewer2D.load()  (+ three, slugText/font)
+```text
+http://127.0.0.1:5173/?model=/samples/simple.dxf
+http://127.0.0.1:3333/?model=/samples/Box.glb
 ```
 
----
+Production build와 preview:
 
-## 의존성
+```bash
+npm run build
+npm --workspace @hmwebviewer/viewer-2d-sample run preview
+npm --workspace @hmwebviewer/viewer-3d run preview
+```
 
-| 패키지 | 역할 |
-|--------|------|
-| `three` | WebGL 렌더 / OrbitControls |
-| `dxf-parser` | DXF 텍스트 파싱 |
-| `opentype.js` | TTF 글리프 (slugText) |
+## 검증
 
-WASM(`acadrust_dwg_bg.wasm`)은 `src/viewer2d/acadrust-dwg/` 에 포함되어 있으며
-Vite `?url` import 로 로드됩니다.
+```bash
+npm run typecheck
+npm run test:unit
+npm run build
+npm run test:artifact
+npm run test:e2e
+```
 
----
+전체 순차 검증:
 
-## 다른 앱에 이식
+```bash
+npm run verify
+```
 
-1. `src/viewer2d/` 폴더 복사  
-2. `npm i three dxf-parser opentype.js`  
-3. 폰트 `public/fonts/NanumGothic-Regular.ttf`  
-4. Vite: `assetsInclude: ['**/*.wasm']`  
-5. `src/main.ts` 의 ①~④ 블록을 호스트에 붙이고 ⑤ UI만 교체  
+2026-07-29 실제 검증 결과:
 
-소스 동기화(선택): 본가 `hmwebviewer/src/viewer2d` 가 업데이트되면 해당 파일을
-이 프로젝트 `src/viewer2d` 로 다시 복사하면 됩니다.
+- workspace typecheck 통과
+- Vitest 5개 file, 8개 test 통과
+- 2D·3D production build 통과
+- production artifact gate 통과:
+  - 2D: 8개 file, 4,302,677 bytes, 50 kB 이상 중복 0개
+  - 3D: 27개 file, 8,149,402 bytes, 50 kB 이상 중복 0개
+- 3D `dist`는 경량화 전 24,945,531 bytes에서 16,796,129 bytes(67.3%) 감소
+- Playwright 17개 E2E 통과, 24.5초
+- build 실패는 없지만 2D main bundle, Three.js, web-ifc와 decoder JS에
+  500 kB 초과 chunk 경고가 있음
 
----
+현재 test가 확인하는 범위:
 
-## 알려진 이슈 / 원본 반영 메모
+- 2D public package interface의 DXF parse
+- 2D same-origin·50 MiB 입력 정책
+- canonical module map 문서 drift
+- single-thread IFC WASM의 installed dependency 대비 checksum과 실행 권한
+- production source map, MT IFC WASM, public decoder 중복과 9 MB artifact budget
+- Vite subpath의 public asset URL
+- 2D DWG/DXF sample과 local file load
+- 3D GLB, Draco GLB, OBJ, FBX, DAE, IFC, PLY sample render
+- 2D/3D canvas dispose와 반복 page transition
+- production subpath의 Draco·Basis KTX2·IFC decoder request와 실제 decode
+- 2D DWG/DXF와 3D GLB/PLY evidence screenshot
 
-| 이슈 | 문서 |
-|------|------|
-| 구형 한글 DWG TEXT 깨짐 (CP949→Latin-1 mojibake) | [`docs/korean-dwg-text-encoding.md`](./docs/korean-dwg-text-encoding.md) |
-| Model + Paper 동시 렌더로 글자 겹침 / Layout 탭 | [`docs/model-paper-space.md`](./docs/model-paper-space.md) |
+이 검증은 sample이 화면에 나타나고 runtime error가 없다는 smoke/contract 수준입니다.
+engineering 정확도와 외부 배포 compliance를 승인하는 test는 아닙니다.
 
-샘플 패치: `fixDwgKoreanText`, `cadSpaces` + Viewer2D 공간 필터, Model/Layout 탭.  
-원본 `hmwebviewer` 반영 절차는 각 문서를 따른다.
+## 문서
 
----
+- [Third-party notices](./THIRD_PARTY_NOTICES.md)
+- [Source와 fixture provenance](./docs/PROVENANCE.md)
+- [DWG/DXF module map](./docs/modules-dwg-dxf.html)
+- [2D sample 안내](./apps/viewer-2d-sample/README.md)
+- [3D architecture](./apps/viewer-3d/docs/architecture.html)
+- [3D 구현 계획](./apps/viewer-3d/PLAN.md)
+- [3D 검증 기록](./apps/viewer-3d/PROGRESS.md)
+- [3D asset 도구](./apps/viewer-3d/tools/README.md)
+- [초기 3D 설계서](./apps/viewer-3d/3d_viewer_architecture_spec.pdf)
 
-## 라이선스 메모
-
-| 조각 | 라이선스 |
-|------|----------|
-| Viewer2D 포트 · 샘플 글루 | MIT (hmwebviewer 계열) |
-| acadrust (WASM 내부) | MPL-2.0 |
-| dxf-parser · three | MIT |
-| NanumGothic | OFL |
+하위 2D README에는 통합 전 standalone layout이, 3D tools README에는 과거 KTX2
+계획이 남아 있습니다. 현재 workspace의 canonical 개요와 배포 판단은 이 문서를
+기준으로 하며, 하위 문서는 후속 정합성 정리가 필요합니다.

THIRD_PARTY_NOTICES.md

@@ -0,0 +1,75 @@
+# Third-party notices
+
+이 문서는 저장소에 직접 포함되어 배포되는 주요 third-party 자산의 출처와
+라이선스를 기록합니다. package manager가 설치하는 전체 dependency 목록은
+lockfile을 기준으로 별도 감사합니다.
+
+## acadrust 0.4.1 / DWG WASM
+
+- 역할: DWG binary parsing
+- upstream: <https://github.com/hakanaktt/acadrust>
+- crate source: <https://crates.io/crates/acadrust/0.4.1>
+- license: Mozilla Public License 2.0
+- license text: [`LICENSES/MPL-2.0.txt`](./LICENSES/MPL-2.0.txt)
+- shipped WASM SHA-256:
+  `aeb211f98e7e4aacfeb2d8430a1ca0fb14b507885f17af13137bd24ed0eca7a3`
+
+WASM binary의 embedded source path에서 `acadrust-0.4.1` 사용을 확인했습니다.
+현재 binary를 최초 생성한 Rust wrapper source와 toolchain은 기존 두 upstream
+repository에 남아 있지 않습니다. 이 저장소는 해당 binary를 standalone commit
+`95fa6a452b50394ff11fba60db482dd038fe2355`에서 checksum을 유지한 채 이관했습니다.
+재현 build와 외부 package 배포는 Gitea issue #3에서 별도로 관리합니다.
+
+## NanumGothic-Regular.ttf
+
+- 역할: DWG/DXF TEXT와 MTEXT glyph rendering
+- upstream: <https://github.com/google/fonts/tree/main/ofl/nanumgothic>
+- copyright: Copyright 2010 The Nanum Project Authors
+- license: SIL Open Font License 1.1
+- license text: [`LICENSES/OFL-1.1.txt`](./LICENSES/OFL-1.1.txt)
+- shipped font SHA-256:
+  `76f45ef4a6bcff344c837c95a7dcc26e017e38b5846d5ae0cdcb5b86be2e2d31`
+
+위 checksum은 Google Fonts의 현재 `NanumGothic-Regular.ttf`와 동일함을
+2026-07-29에 확인했습니다.
+
+## Draco decoder
+
+- 역할: glTF geometry decompression
+- upstream: <https://github.com/google/draco>
+- license: Apache License 2.0
+- license text: <https://github.com/google/draco/blob/main/LICENSE>
+- distribution: 설치된 Three.js의 `DRACO_GLTF_CONFIG` import가 production build에
+  version 일치 hashed JavaScript/WASM asset으로 포함합니다.
+
+## Basis Universal transcoder
+
+- 역할: KTX2/Basis Universal texture transcoding
+- upstream: <https://github.com/BinomialLLC/basis_universal>
+- license: Apache License 2.0
+- license text: <https://github.com/BinomialLLC/basis_universal/blob/master/LICENSE>
+- distribution: 설치된 Three.js의 `KTX2Loader` import가 production build에
+  version 일치 hashed JavaScript/WASM asset으로 포함합니다.
+
+## KTX2 E2E fixture
+
+- 역할: production subpath에서 Basis Universal transcoder 실제 실행 검증
+- upstream:
+  <https://github.com/mrdoob/three.js/blob/42f66a1620be72e497a0bb3bdc7663d21d43169a/examples/textures/ktx2/2d_etc1s.ktx2>
+- license: MIT,
+  <https://github.com/mrdoob/three.js/blob/42f66a1620be72e497a0bb3bdc7663d21d43169a/LICENSE>
+- local path: `tests/fixtures/viewer3d/BasisTexture.ktx2`
+- SHA-256:
+  `e56ddcc757fc73ff06bb0dac2a3533ce79c1e196ad895a3ff7dcc4d9de6b9d5d`
+- distribution: E2E가 same-origin request로만 제공하며 production artifact에는
+  포함하지 않습니다.
+
+## Runtime libraries
+
+- Three.js — MIT, <https://github.com/mrdoob/three.js>
+- dxf-parser — MIT, <https://github.com/gdsestimating/dxf-parser>
+- opentype.js — MIT, <https://github.com/opentypejs/opentype.js>
+- web-ifc — MPL-2.0, <https://github.com/ThatOpen/engine_web-ifc>
+
+각 library의 license text는 clean install 후 해당 package에 포함된 license
+파일에서도 확인할 수 있습니다.

apps/viewer-2d-sample/README.md

@@ -0,0 +1,113 @@
+# dwg-dxf-viewer-sample
+
+**hmwebviewer 형제 폴더**에 분리된 DWG/DXF 2D 뷰어 샘플입니다.
+
+`docs/modules-dwg-dxf.html` 모듈 지도의 카드
+(`acadrust-dwg`, `dxf-parser`, `Viewer2D` …)를 **직접 조합**해 동작하는 독립 프로젝트입니다.
+`hmwebviewer` 저장소 안에 의존하지 않습니다.
+
+```
+D:\MYCLAUDE_PROJECT\
+  hmwebviewer\              ← 본 제품
+  dwg-dxf-viewer-sample\    ← 이 샘플 (형제)
+```
+
+---
+
+## 실행
+
+```bash
+cd D:\MYCLAUDE_PROJECT\dwg-dxf-viewer-sample
+npm install
+npm run dev
+# → http://localhost:5173
+```
+
+| UI | 모듈 경로 |
+|----|-----------|
+| **Sample DWG** | `ext2d` → **acadrust-dwg WASM** → `Viewer2D` |
+| **Sample DXF** | `ext2d` → **dxf-parser + hatch + adapter** → `Viewer2D` |
+| 파일 드롭 / Open | 확장자로 위 둘 중 하나 |
+
+모듈 지도: 브라우저에서 [`docs/modules-dwg-dxf.html`](./docs/modules-dwg-dxf.html)  
+조합 코드: [`src/main.ts`](./src/main.ts)
+
+---
+
+## 레이아웃
+
+```
+dwg-dxf-viewer-sample/
+  docs/modules-dwg-dxf.html   # 모듈 조합 레시피 HTML
+  public/
+    fonts/NanumGothic-Regular.ttf
+    samples/BasicSample.dwg
+    samples/simple.dxf
+  src/
+    main.ts                   # 모듈을 import 해서 조립
+    viewer2d/                 # 재사용 모듈 본체
+      acadrust-dwg/           # WASM
+      Viewer2D.js
+      dwgParser.ts
+      parseDxf.ts
+      dxfAdapter.js
+      dxfHatchHandler.js
+      ext2d.ts
+      slugText.ts
+      …
+  package.json
+  vite.config.ts
+```
+
+---
+
+## 조합 파이프라인
+
+```
+File/URL
+  → ext2d (isDwg / isDxf)
+  → parseDwgBuffer  |  parseDxfBuffer
+       │                    │
+       └ acadrust-dwg       ├ decodeDxf
+                            ├ dxf-parser + dxfHatchHandler
+                            └ dxfAdapter
+  → CadParseResult
+  → Viewer2D.load()  (+ three, slugText/font)
+```
+
+---
+
+## 의존성
+
+| 패키지 | 역할 |
+|--------|------|
+| `three` | WebGL 렌더 / OrbitControls |
+| `dxf-parser` | DXF 텍스트 파싱 |
+| `opentype.js` | TTF 글리프 (slugText) |
+
+WASM(`acadrust_dwg_bg.wasm`)은 `src/viewer2d/acadrust-dwg/` 에 포함되어 있으며
+Vite `?url` import 로 로드됩니다.
+
+---
+
+## 다른 앱에 이식
+
+1. `src/viewer2d/` 폴더 복사  
+2. `npm i three dxf-parser opentype.js`  
+3. 폰트 `public/fonts/NanumGothic-Regular.ttf`  
+4. Vite: `assetsInclude: ['**/*.wasm']`  
+5. `src/main.ts` 의 ①~④ 블록을 호스트에 붙이고 ⑤ UI만 교체  
+
+소스 동기화(선택): 본가 `hmwebviewer/src/viewer2d` 가 업데이트되면 해당 파일을
+이 프로젝트 `src/viewer2d` 로 다시 복사하면 됩니다.
+
+---
+
+## 라이선스 메모
+
+| 조각 | 라이선스 |
+|------|----------|
+| Viewer2D 포트 · 샘플 글루 | MIT (hmwebviewer 계열) |
+| acadrust (WASM 내부) | MPL-2.0 |
+| dxf-parser · three | MIT |
+| NanumGothic | OFL |

apps/viewer-2d-sample/index.html

@@ -0,0 +1,100 @@
+<!doctype html>
+<html lang="ko">
+<head>
+  <meta charset="utf-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1" />
+  <link rel="icon" href="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg'/%3E" />
+  <title>DWG/DXF · 모듈 조합 샘플</title>
+  <style>
+    :root {
+      --bg: #0d1117; --panel: #161b22; --ink: #e6edf3; --muted: #8b949e;
+      --accent: #3fb950; --wasm: #f0a03c; --line: #30363d; --danger: #f85149;
+      --mono: ui-monospace, "Cascadia Code", Consolas, monospace;
+      --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Malgun Gothic", sans-serif;
+    }
+    * { box-sizing: border-box; }
+    html, body { margin: 0; height: 100%; background: var(--bg); color: var(--ink); font-family: var(--sans); }
+    #app { position: fixed; inset: 0; }
+    #toolbar {
+      position: fixed; top: 12px; left: 12px; right: 12px; z-index: 10;
+      display: flex; flex-wrap: wrap; gap: 8px; align-items: center; pointer-events: none;
+    }
+    #toolbar > * { pointer-events: auto; }
+    button, label.btn {
+      background: var(--panel); color: var(--ink); border: 1px solid var(--line);
+      border-radius: 8px; padding: 8px 12px; font: 13px var(--sans); cursor: pointer;
+    }
+    button:hover, label.btn:hover { border-color: var(--accent); }
+    button.primary { background: #238636; border-color: #2ea043; }
+    button.wasm { border-color: var(--wasm); color: var(--wasm); }
+    label.btn input { display: none; }
+    #status {
+      margin-left: auto; font: 12px var(--mono); color: var(--muted);
+      background: rgba(22,27,34,.85); border: 1px solid var(--line);
+      border-radius: 8px; padding: 8px 12px; max-width: min(48vw, 480px);
+      white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
+    }
+    #status.err { color: var(--danger); }
+    #recipe {
+      position: fixed; bottom: 14px; left: 14px; z-index: 10; max-width: 340px;
+      background: rgba(22,27,34,.94); border: 1px solid var(--line); border-radius: 10px;
+      padding: 12px 14px; font-size: 12px; line-height: 1.45; color: var(--muted);
+      box-shadow: 0 8px 24px rgba(0,0,0,.35);
+    }
+    #recipe h3 {
+      margin: 0 0 8px; font: 600 11px var(--mono); letter-spacing: .1em;
+      text-transform: uppercase; color: var(--accent);
+    }
+    #recipe ol { margin: 0; padding-left: 18px; }
+    #recipe li { margin-bottom: 4px; }
+    #recipe code { font-family: var(--mono); font-size: 11px; color: var(--ink); }
+    #recipe .mod-w { color: var(--wasm); }
+    #recipe .mod-j { color: var(--accent); }
+    #recipe a { color: var(--accent); font-family: var(--mono); font-size: 11px; }
+    #layers {
+      position: fixed; top: 56px; right: 12px; width: 200px; max-height: 50vh;
+      overflow: auto; z-index: 10; background: rgba(22,27,34,.95);
+      border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px;
+      font-size: 12px; display: none;
+    }
+    #layers h3 { margin: 0 0 8px; font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
+    #layers label { display: flex; gap: 8px; align-items: center; margin: 4px 0; cursor: pointer; }
+    #layers .swatch { width: 10px; height: 10px; border-radius: 2px; flex-shrink: 0; }
+  </style>
+</head>
+<body>
+  <div id="app"></div>
+
+  <div id="toolbar">
+    <label class="btn">
+      Open file
+      <input id="file" type="file" accept=".dwg,.dxf" />
+    </label>
+    <button id="sample" class="primary wasm" type="button" title="acadrust-dwg WASM">Sample DWG</button>
+    <button id="sampleDxf" class="primary" type="button" title="dxf-parser">Sample DXF</button>
+    <button id="fit" type="button">Fit (F)</button>
+    <button id="theme" type="button">Theme</button>
+    <button id="layersBtn" type="button">Layers</button>
+    <div id="status">ready</div>
+  </div>
+
+  <div id="layers"><h3>Layers</h3><div id="layerList"></div></div>
+
+  <aside id="recipe">
+    <h3>Module recipe</h3>
+    <ol>
+      <li><code class="mod-j">ext2d</code> — .dwg / .dxf 분기</li>
+      <li><code class="mod-w">acadrust-dwg</code> 또는 <code class="mod-j">dxf-parser</code></li>
+      <li><code class="mod-j">dxfAdapter</code> — DXF → 공통 스키마</li>
+      <li><code class="mod-j">Viewer2D</code> + <code class="mod-j">three</code> 렌더</li>
+      <li><code class="mod-j">slugText</code> + TTF 폰트</li>
+    </ol>
+    <p style="margin:10px 0 0">
+      코드: <code>src/main.ts</code> ·
+      지도: <a href="./docs/modules-dwg-dxf.html" target="_blank">docs/modules-dwg-dxf.html</a>
+    </p>
+  </aside>
+
+  <script type="module" src="/src/main.ts"></script>
+</body>
+</html>

apps/viewer-2d-sample/package.json

@@ -0,0 +1,19 @@
+{
+  "name": "@hmwebviewer/viewer-2d-sample",
+  "private": true,
+  "version": "0.1.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite --host 127.0.0.1 --port 5173 --strictPort",
+    "build": "tsc --noEmit && vite build",
+    "build:subpath:e2e": "vite build --base=/viewer-2d/ --outDir=dist-subpath",
+    "preview": "vite preview",
+    "preview:subpath:e2e": "vite preview --base=/viewer-2d/ --outDir=dist-subpath --host 127.0.0.1 --port 45173 --strictPort",
+    "serve:subpath:e2e": "npm run build:subpath:e2e && npm run preview:subpath:e2e",
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "@hmwebviewer/viewer2d": "*",
+    "three": "0.185.1"
+  }
+}

apps/viewer-2d-sample/src/cadInputPolicy.ts

@@ -0,0 +1,72 @@
+export const MAX_CAD_BYTES = 50 * 1024 * 1024;
+export const CAD_FETCH_TIMEOUT_MS = 15_000;
+
+export function assertCadByteLength(byteLength: number): void {
+  if (!Number.isFinite(byteLength) || byteLength < 0) {
+    throw new Error('CAD 파일 크기를 확인할 수 없습니다.');
+  }
+  if (byteLength > MAX_CAD_BYTES) {
+    throw new Error('CAD 파일은 50 MiB 이하여야 합니다.');
+  }
+}
+
+export function resolveCadUrl(input: string, base: URL): URL {
+  const url = new URL(input, base);
+  if (!['http:', 'https:'].includes(url.protocol)) {
+    throw new Error('CAD URL은 HTTP(S)만 허용합니다.');
+  }
+  if (url.origin !== base.origin) {
+    throw new Error('CAD URL은 viewer와 같은 origin만 허용합니다.');
+  }
+  return url;
+}
+
+export async function fetchCadBuffer(url: URL): Promise<ArrayBuffer> {
+  const controller = new AbortController();
+  const timeout = window.setTimeout(() => controller.abort(), CAD_FETCH_TIMEOUT_MS);
+
+  try {
+    const response = await fetch(url, {
+      credentials: 'same-origin',
+      signal: controller.signal,
+    });
+    if (!response.ok) throw new Error(`HTTP ${response.status}`);
+
+    const declaredLength = Number(response.headers.get('content-length'));
+    if (Number.isFinite(declaredLength) && declaredLength > 0) {
+      assertCadByteLength(declaredLength);
+    }
+
+    if (!response.body) {
+      const buffer = await response.arrayBuffer();
+      assertCadByteLength(buffer.byteLength);
+      return buffer;
+    }
+
+    const reader = response.body.getReader();
+    const chunks: Uint8Array[] = [];
+    let total = 0;
+    while (true) {
+      const { done, value } = await reader.read();
+      if (done) break;
+      total += value.byteLength;
+      assertCadByteLength(total);
+      chunks.push(value);
+    }
+
+    const data = new Uint8Array(total);
+    let offset = 0;
+    for (const chunk of chunks) {
+      data.set(chunk, offset);
+      offset += chunk.byteLength;
+    }
+    return data.buffer;
+  } catch (error) {
+    if (controller.signal.aborted) {
+      throw new Error('CAD 파일 요청 시간이 초과되었습니다.');
+    }
+    throw error;
+  } finally {
+    window.clearTimeout(timeout);
+  }
+}

apps/viewer-2d-sample/src/main.ts

@@ -0,0 +1,183 @@
+/**
+ * ═══════════════════════════════════════════════════════════════════
+ *  DWG/DXF viewer sample — 모듈 조합 레시피
+ *  (docs/modules-dwg-dxf.html 에 정리된 모듈을 그대로 조립)
+ *
+ *  이 프로젝트는 hmwebviewer 와 형제 폴더로 분리된 독립 샘플입니다.
+ *  ═══════════════════════════════════════════════════════════════════
+ *
+ *  ┌─ 모듈 지도 카드 ──────────────┬─ 이 파일에서의 역할 ──────────┐
+ *  │ acadrust-dwg (WASM)           │ DWG 바이트 → parseResult      │
+ *  │ dxf-parser + dxfHatchHandler  │ DXF 텍스트 → parseResult      │
+ *  │ dxfAdapter                    │ dxf-parser 출력을 공통 스키마로 │
+ *  │ Viewer2D                      │ parseResult → three 씬 렌더   │
+ *  │ three (peer)                  │ WebGLRenderer / OrbitControls │
+ *  │ slugText + NanumGothic.ttf    │ TEXT/MTEXT 한글·라틴 표시     │
+ *  │ ext2d                         │ .dwg / .dxf 확장자 판별       │
+ *  └───────────────────────────────┴───────────────────────────────┘
+ *
+ *  흐름:  File/URL → (확장자 분기) → 파서 → CadParseResult → Viewer2D.load()
+ */
+
+// ── ① 모듈 지도의 각 카드 (src/viewer2d/*) ────────────────────────
+import {
+  createViewer2D,
+  isCad2DFile,
+  loadCad,
+  type CadLoadSummary,
+} from '@hmwebviewer/viewer2d';
+import {
+  assertCadByteLength,
+  fetchCadBuffer,
+  resolveCadUrl,
+} from './cadInputPolicy';
+
+// parseDxfBuffer 내부:
+//   dxf-parser → HatchHandler → dxfAdapter
+// parseDwgBuffer 내부:
+//   acadrustParser → acadrust-dwg WASM
+
+// ── ② 호스트 정적 자산 ──────────────────────────────────────────
+const appBase = new URL(import.meta.env.BASE_URL, window.location.origin);
+const publicUrl = (path: string) => new URL(path, appBase).href;
+
+// ── ③ Viewer2D 마운트 ───────────────────────────────────────────
+const app = document.getElementById('app')!;
+const statusEl = document.getElementById('status')!;
+const layerList = document.getElementById('layerList')!;
+const layersPanel = document.getElementById('layers')!;
+
+function setStatus(msg: string, err = false) {
+  statusEl.textContent = msg;
+  statusEl.classList.toggle('err', err);
+}
+
+const viewer = createViewer2D(app, {
+  fontUrl: publicUrl('fonts/NanumGothic-Regular.ttf'),
+});
+declare global {
+  interface Window {
+    __viewer2d?: typeof viewer;
+  }
+}
+window.__viewer2d = viewer;
+viewer.onSelect((entity: unknown) => {
+  if (!entity) {
+    setStatus('deselected');
+    return;
+  }
+  const e = entity as { type?: string; layer?: string; handle?: { value?: string } };
+  setStatus(`select ${e.type ?? '?'} · layer=${e.layer ?? '-'} · h=${e.handle?.value ?? '-'}`);
+});
+
+// ── ④ 파서 조합 ─────────────────────────────────────────────────
+async function loadAndRender(buf: ArrayBuffer, name: string): Promise<CadLoadSummary> {
+  return loadCad(viewer, { data: buf, name });
+}
+
+async function loadUrl(url: string, nameHint?: string) {
+  const resolved = resolveCadUrl(url, new URL(window.location.href));
+  const name = nameHint ?? resolved.pathname.split('/').pop() ?? resolved.href;
+  return loadAndRender(await fetchCadBuffer(resolved), name);
+}
+
+async function loadFile(file: File) {
+  if (!isCad2DFile(file.name)) throw new Error(`not .dwg/.dxf: ${file.name}`);
+  assertCadByteLength(file.size);
+  return loadAndRender(await file.arrayBuffer(), file.name);
+}
+
+// ── ⑤ 호스트 UI 글루 ────────────────────────────────────────────
+function fillLayers() {
+  layerList.innerHTML = '';
+  for (const L of viewer.getLayerInfo()) {
+    const label = document.createElement('label');
+    label.dataset.name = L.name;
+    const sw = document.createElement('span');
+    sw.className = 'swatch';
+    sw.style.background = L.colorHex || '#888';
+    const cb = document.createElement('input');
+    cb.type = 'checkbox';
+    cb.checked = L.visible;
+    cb.addEventListener('change', () => {
+      const next = new Set<string>();
+      layerList.querySelectorAll('label').forEach((row) => {
+        const input = row.querySelector('input') as HTMLInputElement;
+        if (!input.checked) next.add(row.dataset.name!);
+      });
+      viewer.setHiddenLayers(next);
+    });
+    const text = document.createElement('span');
+    text.textContent = `${L.name} (${L.count})`;
+    label.append(sw, cb, text);
+    layerList.append(label);
+  }
+}
+
+async function afterLoad(name: string, result: CadLoadSummary) {
+  setStatus(`✓ ${name} · ${result.entityCount} entities`);
+  fillLayers();
+  viewer.fit();
+}
+
+async function run(label: string, job: () => Promise<CadLoadSummary>) {
+  setStatus(`loading ${label}…`);
+  try {
+    await afterLoad(label, await job());
+  } catch (err) {
+    setStatus(`${label}: ${(err as Error).message}`, true);
+    console.error(err);
+  }
+}
+
+document.getElementById('sample')!.addEventListener('click', () => {
+  void run('BasicSample.dwg', () =>
+    loadUrl(publicUrl('samples/BasicSample.dwg'), 'BasicSample.dwg'),
+  );
+});
+document.getElementById('sampleDxf')!.addEventListener('click', () => {
+  void run('simple.dxf', () => loadUrl(publicUrl('samples/simple.dxf'), 'simple.dxf'));
+});
+document.getElementById('file')!.addEventListener('change', (ev) => {
+  const file = (ev.target as HTMLInputElement).files?.[0];
+  if (!file) return;
+  void run(file.name, () => loadFile(file));
+  (ev.target as HTMLInputElement).value = '';
+});
+document.getElementById('fit')!.addEventListener('click', () => viewer.fit());
+let dark = true;
+document.getElementById('theme')!.addEventListener('click', () => {
+  dark = !dark;
+  viewer.setTheme(dark);
+});
+document.getElementById('layersBtn')!.addEventListener('click', () => {
+  layersPanel.style.display = layersPanel.style.display === 'block' ? 'none' : 'block';
+});
+
+window.addEventListener('dragover', (e) => e.preventDefault());
+window.addEventListener('drop', (e) => {
+  e.preventDefault();
+  const file = e.dataTransfer?.files?.[0];
+  if (file) void run(file.name, () => loadFile(file));
+});
+
+const model = new URLSearchParams(location.search).get('model');
+if (model) {
+  try {
+    const resolved = resolveCadUrl(model, new URL(window.location.href));
+    void run(model, () => loadUrl(resolved.href));
+  } catch (error) {
+    setStatus((error as Error).message, true);
+  }
+} else {
+  setStatus('ready · Sample DWG / DXF 또는 파일 드롭');
+}
+
+window.addEventListener(
+  'pagehide',
+  () => {
+    viewer.dispose();
+    delete window.__viewer2d;
+  },
+  { once: true },
+);

apps/viewer-2d-sample/tsconfig.json

@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["src/**/*", "vite.config.ts"]
+}

apps/viewer-3d/.claude/agents/asset-pipeline.md

@@ -0,0 +1,28 @@
+---
+name: asset-pipeline
+description: >
+  Builds the offline asset optimization pipeline for hmwebviewer: gltf-transform
+  Draco+KTX2 compression (tools/preprocess.mjs), sample asset set, and the 360°
+  pre-render pipeline (Blender CLI or Puppeteer) producing animated WebP placeholders.
+  Use for tools/* and samples/* work. Parallelizable with viewer-core and dnd-handler.
+tools: [Read, Edit, Write, Grep, Glob, Bash]
+---
+
+You build the offline asset pipeline. Not runtime code — tooling + sample assets.
+
+## Non-negotiables
+- Compression: `gltf-transform` with Draco (geometry) + KTX2/Basis (textures) functions. Both compatible.
+- Draco quantization bits: tune per asset; default sane (e.g. 14/12). Log resulting sizes.
+- KTX2 needs the `toktx` encoder available — detect, document install if missing.
+- Pre-render: prefer Blender headless CLI 360° turntable (camera parented to empty, Z 360°, keyframed) → frames → assemble animated WebP (alpha) / WebM VP9 via ffmpeg. Fallback: Puppeteer + headless three.js `page.screenshot({type:'webp'})` per rotation step.
+- Output WebP placeholders land in `public/previews/`.
+
+## Workflow
+1. Read PLAN.md task acceptance criteria.
+2. Implement `tools/preprocess.mjs` (CLI: input GLB → output compressed GLB) or the prerender script.
+3. Provide sample assets under `samples/` (small/medium/large) if tasked.
+4. Verify: run the tool, show before/after sizes; load compressed output in the viewer successfully.
+5. Document usage in tool header comment.
+
+## Scope
+Only `tools/`, `samples/`, and writing generated outputs to `public/previews/`. Do not modify runtime viewer code.

apps/viewer-3d/.claude/agents/dnd-handler.md

@@ -0,0 +1,27 @@
+---
+name: dnd-handler
+description: >
+  Implements the drag & drop local-file path for hmwebviewer: HTML5 DnD event
+  capture, file type/size validation, URL.createObjectURL + revoke lifecycle,
+  wiring to loadLocalFile. Use for src/dnd/* work. Parallelizable with viewer-core.
+tools: [Read, Edit, Write, Grep, Glob, Bash]
+---
+
+You implement the Drag & Drop local-file load path. Surgical, minimal, verified.
+
+## Non-negotiables
+- Validate file type (.glb/.gltf) + size on `drop` BEFORE creating object URL. Reject with a clear UI message.
+- `URL.createObjectURL(file)` → hand blob URL to `loadLocalFile` (viewer-core) → **revoke after load completes** (success and error paths).
+- Dropzone must also accept click-to-browse (accessibility), not just drag.
+- Prevent default browser behavior on dragover/drop (no file opens in tab).
+- Large-file parsing can stall UI — show progress; consider yielding.
+
+## Workflow
+1. Read PLAN.md task acceptance criteria + PROGRESS.md current state.
+2. Coordinate interface with `viewer-core`'s `loadLocalFile(fileBlob)` signature — read it, do not assume.
+3. Implement minimum that meets acceptance.
+4. Verify: drop a sample GLB → loads; drop invalid file → rejected message; heap stable across N drops (DevTools).
+5. Report changes (file:line) + verification result.
+
+## Scope
+Only `src/dnd/`, `src/ui/` (dropzone/progress pieces), and the wiring call. If viewer-core's loader API is missing, stop and request it rather than building a parallel loader.

apps/viewer-3d/.claude/agents/hydration.md

@@ -0,0 +1,26 @@
+---
+name: hydration
+description: >
+  Implements the SSR→CSR hydration layer for hmwebviewer: WebP placeholder element,
+  CSS opacity transition, executeHydration() coordination (fade only after WebGL ready
+  AND model loaded), and UI state toggling. Depends on viewer-core. Use for src/viewer/hydration* and SSR placeholder work.
+tools: [Read, Edit, Write, Grep, Glob, Bash]
+---
+
+You implement the SSR hydration transition. Coordinate carefully — this is where races bite.
+
+## Non-negotiables
+- Fade placeholder → canvas ONLY when BOTH: (a) WebGL context ready, (b) model fully added to scene. Use Promise.all or two flags gating one transition.
+- Transition: CSS `opacity 0.5s ease`, placeholder `opacity: 0` then `display: none` after 500ms. Mirror spec.
+- No empty-canvas flash. If model not ready, placeholder stays visible.
+- UI states: progress bar visible during load, hidden on ready; loading→ready reflected.
+- Expose a clean hook (`executeHydration()`) the viewer calls on load completion.
+
+## Workflow
+1. Read PLAN.md task acceptance criteria + the `viewer-core` load completion point (read the code, do not assume).
+2. Implement placeholder element + transition + coordination.
+3. Verify manually: load server asset → placeholder shows → fades cleanly to model; trigger slow model load → placeholder stays until ready (no flash).
+4. Report changes (file:line) + verification result.
+
+## Scope
+Placeholder/transition/coordination code. Depends on viewer-core load signals — if those don't exist yet, stop and request the interface.

apps/viewer-3d/.claude/agents/reviewer.md

@@ -0,0 +1,30 @@
+---
+name: reviewer
+description: >
+  Hardening + review agent for hmwebviewer: memory-leak/dispose audit, error handling
+  gaps, performance smoke (<3s perceived load), and a final correctness + simplification
+  pass. Read-mostly; proposes fixes, applies only when explicitly tasked. Use in Phase 5
+  and on-demand for reviews.
+tools: [Read, Grep, Glob, Bash]
+---
+
+You review and harden. Skeptical, specific, no praise.
+
+## Checks
+- **Leaks**: every `createObjectURL` has a matching `revokeObjectURL` (success + error). Every geometry/material/texture created has a `dispose()` on teardown. Scene instantiated once, not per load.
+- **Loaders**: single shared DRACOoader/KTX2Loader instance — grep for `new DRACOLoader` / `new KTX2Loader`, flag >1.
+- **Errors**: bad file, decode failure, WebGL unsupported → graceful message, no uncaught promise rejection.
+- **Perf**: load each sample asset, measure perceived load time, assert <3s. Record timings.
+- **Simplification**: dead code, redundant abstraction, over-engineering — flag with rationale.
+
+## Output
+One line per finding:
+```
+path:line — 🔴/🟡/🟢 <problem>. <fix>.
+```
+Group by file. End with verdict line: `N critical, M warn, K nit.`
+
+## Rules
+- Read-only by default. Apply fixes only if the task explicitly authorizes it; otherwise hand findings to task-lead.
+- Quote real command output for perf numbers — no estimates.
+- Skip style nits that don't change meaning.

apps/viewer-3d/.claude/agents/task-lead.md

@@ -0,0 +1,32 @@
+---
+name: task-lead
+description: >
+  Orchestrator for the hmwebviewer multi-agent build. Reads PLAN.md + PROGRESS.md,
+  selects the next task whose dependencies are satisfied, and either implements it
+  or delegates to the right specialist agent (viewer-core, dnd-handler, asset-pipeline,
+  hydration). Use first, or when you need to decide what to work on next.
+tools: [Read, Edit, Write, Grep, Glob, Bash, TodoWrite]
+---
+
+You are the task-lead for the hmwebviewer project. Coordinate, don't hoard.
+
+## On start
+1. Read `CLAUDE.md`, `PLAN.md`, `PROGRESS.md`.
+2. Find the next `todo` task whose `depends_on` are all `done`.
+3. If none → report blocked, propose a path forward, stop.
+4. Decide: implement yourself (small task) OR delegate to specialist (task's Agent column).
+
+## Delegation rules
+- `viewer-core`, `dnd-handler`, `asset-pipeline`, `hydration` → spawn the matching agent via the Agent tool with the task ID + acceptance criteria.
+- Tasks in the same wave with no mutual dependency → dispatch in parallel (one message, multiple Agent calls).
+- Always pass: task ID, file scope, acceptance criteria, pointer to PLAN.md.
+
+## Before marking done
+- Acceptance criteria from PLAN.md must actually pass (quote real command output).
+- Append a `## YYYY-MM-DD — <task>` entry to PROGRESS.md (Did / Result / Next / Blocker).
+- Flip the task row in PLAN.md to `done`.
+
+## Never
+- Start work without reading PLAN + PROGRESS.
+- Mark done without verification.
+- Edit outside the task's file scope.

apps/viewer-3d/.claude/agents/viewer-core.md

@@ -0,0 +1,27 @@
+---
+name: viewer-core
+description: >
+  Implements the Three.js viewer core for hmwebviewer: WebGLRenderer scene setup,
+  singleton GLTFLoader + DRACOLoader + KTX2Loader, loadServerAsset/loadLocalFile,
+  OrbitControls, camera framing. Use for src/viewer/* work.
+tools: [Read, Edit, Write, Grep, Glob, Bash]
+---
+
+You implement the Three.js viewer core. Surgical, minimal, verified.
+
+## Non-negotiables (from locked decisions)
+- ONE shared instance each of GLTFLoader, DRACOLoader, KTX2Loader. Multiple DRACOLoader instances crash (three.js #22445). Export a factory/singleton.
+- Decoder path: `/draco/` and `/basis/` under public, or CDN fallback. Pin decoder version to the installed three.js version.
+- `loadLocalFile`: `URL.createObjectURL(file)` → load → **`URL.revokeObjectURL()` in the success callback**. Memory leak otherwise.
+- Hydration: only fade placeholder AFTER (WebGL ready) AND (model added to scene). Race = empty canvas flash — coordinate via flags/Promise.all.
+- Dispose geometries/materials/textures on teardown.
+
+## Workflow
+1. Read PLAN.md task acceptance criteria.
+2. Read existing `src/viewer/*` before editing — match style.
+3. Implement minimum that meets acceptance.
+4. Verify: `npm run build` exits 0; run the load against a sample asset; quote output.
+5. Report exactly what changed (file:line) + verification result.
+
+## Scope
+Only `src/viewer/`, `src/scenes/`, decoder wiring. Touch other dirs only if the task explicitly says so. If a task needs dnd/hydration/asset work, say so and stop — that's another agent.

apps/viewer-3d/.claude/commands/bootstrap.md

@@ -0,0 +1,13 @@
+---
+description: Bootstrap the hmwebviewer project from the architecture spec (Phase 0). Run once when PLAN.md is not started.
+---
+
+Read `CLAUDE.md`, `PLAN.md`, `3d_viewer_architecture_spec.pdf` (extract via `pdftotext -layout`), then execute Phase 0 of PLAN.md:
+
+1. Scaffold Vite + TypeScript project. Install `three` + `@types/three`.
+2. Place Draco + KTX2 decoder assets under `public/draco` and `public/basis` (or wire CDN fallback). Pin to the installed three.js version.
+3. Create a minimal `src/viewer/ThreeDViewer.ts` with a WebGLRenderer scene (camera, lights, resize loop) rendering a test cube.
+
+Verify each step with real output: `npm run dev` serves, `npm run build` exits 0, console clean. Update PLAN.md (P0-* → done) and append to PROGRESS.md.
+
+Arguments: $ARGUMENTS (optional override, e.g. package manager `pnpm`/`npm`).

apps/viewer-3d/.claude/commands/next-task.md

@@ -0,0 +1,13 @@
+---
+description: Read PLAN.md + PROGRESS.md and pick the next ready task. Claims it and tells you (or an agent) what to do.
+---
+
+Read `PLAN.md` and `PROGRESS.md`. Find the first `todo` task whose `depends_on` are all `done`.
+
+- If found: print the task ID, name, file scope, acceptance criteria, and which specialist agent should own it. Recommend spawning that agent (or doing it inline if small).
+- If a candidate is `blocked`: surface the blocker and the task it waits on.
+- If none ready: say so explicitly and list what must complete first.
+
+Do not start implementing — this command only selects and reports. (Use `/bootstrap` for Phase 0, or delegate to the owning agent for the task.)
+
+Arguments: $ARGUMENTS (optional — restrict to a phase, e.g. `phase 1`).

apps/viewer-3d/.claude/commands/optimize-asset.md

@@ -0,0 +1,13 @@
+---
+description: Run the offline asset optimization pipeline (gltf-transform Draco + KTX2) on a GLB file. Optionally pre-render a 360 WebP placeholder.
+---
+
+Asset path required: $ARGUMENTS  (e.g. `/optimize-asset samples/robot.glb`)
+
+Steps:
+1. Confirm `tools/preprocess.mjs` exists; if not, delegate to the `asset-pipeline` agent to build it first.
+2. Run the compressor on the input GLB → output to `samples/<name>.optimized.glb`. Print before/after sizes and the reduction %.
+3. If a second arg `--prerender` is given, also run the 360° pre-render pipeline to produce `public/previews/<name>.webp`.
+4. Verify the optimized GLB still loads in the viewer (load test).
+
+If `gltf-transform` or `toktx` (KTX2 encoder) is missing, report the install command and stop — do not silently skip.

apps/viewer-3d/.claude/commands/report.md

@@ -0,0 +1,17 @@
+---
+description: Append a status entry to PROGRESS.md summarizing what you just did.
+---
+
+Append a new entry to the TOP of the `## Work log` section in `PROGRESS.md`. Use this format:
+
+```
+## YYYY-MM-DD — <task ID or summary>
+- Did: <concrete changes, file:line>
+- Result/verify: <real command output or test result, quoted>
+- Next: <what the next task/agent should pick up>
+- Blocker (if any): <blocker or "none">
+```
+
+Today's date is in the session context (currentDate). Also flip the matching task row in `PLAN.md` to `done` (or `in_progress(@you)` if mid-task).
+
+Arguments: $ARGUMENTS — free text summary; if omitted, infer from recent work.

apps/viewer-3d/.claude/commands/verify-viewer.md

@@ -0,0 +1,13 @@
+---
+description: Build + smoke-test the viewer: typecheck, production build, and a headless load of a sample asset to confirm perceived load < 3s.
+---
+
+Run, in order, quoting real output:
+1. Typecheck / lint (e.g. `npm run build` — Vite runs tsc + bundle). Must exit 0.
+2. Production build artifact exists under `dist/`.
+3. Headless load smoke: serve `dist/`, load a sample asset (server path) via Puppeteer/playwright OR a node script using the viewer, measure time-to-first-render. Assert < 3000ms perceived.
+4. (If a local-file path exists) simulate a drop of a sample GLB and confirm load + revoke.
+
+Append timings to PROGRESS.md. If any step fails, do not mark the work done — report the failure output.
+
+Arguments: $ARGUMENTS — optional asset path or flag to skip headless (`--no-headless`).

apps/viewer-3d/.claude/hooks/progress-nudge.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+# PostToolUse hook (Edit|Write) — nudge to update PROGRESS.md when runtime code changes.
+# Reads the tool call JSON from stdin; if the touched file is under src/ or tools/,
+# emit a one-line reminder. Non-zero/empty output otherwise.
+input="$(cat)"
+path="$(printf '%s' "$input" | grep -o '"file_path"[[:space:]]*:[[:space:]]*"[^"]*"' | head -1 | sed 's/.*"file_path"[[:space:]]*:[[:space:]]*"//;s/"$//')"
+case "$path" in
+  *"/src/"*|*"/tools/"*)
+    echo "Edited runtime code ($path). If a PLAN.md task finished, run /report to update PROGRESS.md and flip its status."
+    ;;
+esac
+exit 0

apps/viewer-3d/.claude/hooks/session-start.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+# SessionStart hook — remind the agent of the multi-agent protocol.
+# Output (stdout) is injected as context into the session.
+echo "hmwebviewer: read PLAN.md + PROGRESS.md before starting any work."
+echo "Pick next 'todo' task whose depends_on are all 'done'. See CLAUDE.md."
+exit 0

apps/viewer-3d/.claude/settings.json

@@ -0,0 +1,36 @@
+{
+  "permissions": {
+    "allow": [
+      "Edit(/.claude/skills/modeler-architecture/**)",
+      "Edit(/.claude/skills/license-gate/**)",
+      "Edit(/.claude/skills/feature-recipe/**)",
+      "Edit(/.claude/skills/topo-naming/**)"
+    ]
+  },
+  "hooks": {
+    "SessionStart": [
+      {
+        "matcher": "startup|resume|clear",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "bash .claude/hooks/session-start.sh",
+            "timeout": 10
+          }
+        ]
+      }
+    ],
+    "PreToolUse": [
+      {
+        "matcher": "Edit|Write",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "bash .claude/hooks/license-guard.sh",
+            "timeout": 10
+          }
+        ]
+      }
+    ]
+  }
+}

apps/viewer-3d/.claude/skills/task-graph/SKILL.md

@@ -0,0 +1,43 @@
+---
+name: task-graph
+description: >
+  Multi-agent coordination protocol for hmwebviewer. Load when picking up work,
+  dispatching agents, or reporting progress. Explains how PLAN.md and PROGRESS.md
+  drive parallel agent work and the exact update rules.
+---
+
+# hmwebviewer — multi-agent task-graph protocol
+
+`PLAN.md` = the backlog (what to do). `PROGRESS.md` = the log (what happened). CLAUDE.md mandates reading both on every agent start.
+
+## Picking a task
+1. Read `PLAN.md` task tables.
+2. Find rows with status `todo` whose entire `depends_on` list is `done`.
+3. Among those, pick by wave (see PLAN.md "Parallelization map") or by the task's `Agent` column.
+4. Before working: flip status to `in_progress(@yourname)` in PLAN.md.
+
+## Dispatching parallel work
+Tasks in the same wave with no mutual dependency run concurrently:
+- viewer-core, dnd-handler, asset-pipeline → independent, parallel-safe (different dirs: `src/viewer`, `src/dnd`, `tools`).
+- hydration depends on viewer-core signals → run after.
+- reviewer → last / on-demand.
+
+Spawn each via the Agent tool in ONE message with multiple calls so they run concurrently. Pass every agent: task ID, file scope, acceptance criteria, pointer to PLAN.md.
+
+## Completing a task
+Only after acceptance criteria verified with real output:
+1. Flip the PLAN.md row to `done`.
+2. Append a `## YYYY-MM-DD — <task>` entry to PROGRESS.md top of Work log (Did / Result / Next / Blocker).
+3. If a decision was made, add to PROGRESS.md "Decision log" and (if durable) to user memory.
+
+## Blocking
+If you cannot proceed (missing dependency, ambiguous spec, env failure):
+- Flip status to `blocked(<reason>)` in PLAN.md.
+- Append PROGRESS.md entry with the blocker.
+- Stop. Do not guess around a real blocker.
+
+## Anti-patterns
+- Working without reading PLAN + PROGRESS → duplicate/conflicting work.
+- Marking done without verification → silent regressions.
+- Editing outside your task's file scope → steps on another agent.
+- Creating parallel loaders/state instead of using the shared singleton → crashes.

apps/viewer-3d/.claude/skills/threejs-viewer/SKILL.md

@@ -0,0 +1,89 @@
+---
+name: threejs-viewer
+description: >
+  Domain knowledge for building the hmwebviewer Three.js 3D viewer. Load when working
+  on src/viewer, src/dnd, src/ui, the asset pipeline, or hydration. Covers the locked
+  technical decisions, loader setup, Draco/KTX2, Blob URL lifecycle, and SSR hydration
+  patterns specific to this project.
+---
+
+# hmwebviewer — Three.js 3D viewer domain guide
+
+Source spec: `3d_viewer_architecture_spec.pdf`. Always also read `CLAUDE.md` + `PLAN.md`.
+
+## Locked stack
+- Three.js + Vite + TypeScript.
+- Loaders: `GLTFLoader` + `DRACOLoader` + `KTX2Loader`.
+- Compression: Draco (geometry) + KTX2/Basis Universal (textures).
+
+## Critical patterns (do not deviate without approval)
+
+### Single shared loader instances
+Multiple simultaneous `DRACOLoader` instances crash (three.js #22445). KTX2 same risk. Build a singleton:
+
+```ts
+// src/viewer/loaders.ts
+import * as THREE from 'three';
+import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader.js';
+import { DRACOLoader } from 'three/examples/jsm/loaders/DRACOLoader.js';
+import { KTX2Loader } from 'three/examples/jsm/loaders/KTX2Loader.js';
+
+let _gltf: GLTFLoader | null = null;
+export function getLoaders(renderer: THREE.WebGLRenderer) {
+  if (!_gltf) {
+    const draco = new DRACOLoader().setDecoderPath('/draco/');
+    const ktx2  = new KTX2Loader().setTranscoderPath('/basis/').detectSupport(renderer);
+    _gltf = new GLTFLoader().setDRACOLoader(draco).setKTX2Loader(ktx2);
+  }
+  return _gltf;
+}
+```
+
+Pin decoder WASM version to the installed three.js version. Mismatch → silent decode failures.
+
+### Local file load (Blob URL lifecycle)
+```ts
+const url = URL.createObjectURL(file);
+loader.load(url, (gltf) => {
+  scene.add(gltf.scene);
+  URL.revokeObjectURL(url);          // success → revoke
+}, undefined, (err) => {
+  URL.revokeObjectURL(url);          // error → also revoke
+  throw err;
+});
+```
+For repeat/cached loads: `FileReader` → `ArrayBuffer` → `GLTFLoader.parse()` enables IndexedDB caching and avoids URL overhead.
+
+### Server asset (SSR + CSR + hydration)
+1. SSR ships HTML/CSS skeleton + pre-rendered 360° animated WebP placeholder.
+2. CSR background: `GLTFLoader.load(serverUrl, onLoad, onProgress)`.
+3. Hydration: gate the fade on BOTH `webglReady` AND `modelLoaded` (Promise.all). Fade CSS `opacity 0.5s ease` → `display:none` after 500ms. Race → empty canvas flash.
+
+### Drag & drop
+```ts
+dropzone.addEventListener('dragover', (e) => { e.preventDefault(); });
+dropzone.addEventListener('drop', (e) => {
+  e.preventDefault();
+  const file = e.dataTransfer?.files?.[0];
+  if (!file) return;
+  if (!/\.gl[bt]f$/i.test(file.name)) return showError('GLB/GLTF only');
+  loadLocalFile(file);   // viewer-core, handles createObjectURL/revoke
+});
+```
+Also wire click→`<input type=file">` for accessibility.
+
+### Disposal
+On teardown / model swap: `geometry.dispose()`, `material.dispose()` (and material maps), `texture.dispose()`. Revoke any lingering object URLs.
+
+## Offline asset pipeline
+- Compress: `gltf-transform` CLI or programmatic functions — Draco + KTX2 in one pass.
+- KTX2 encoder binary `toktx` must be on PATH (gltf-transform fetches via `@ktx2/basis-transcoder`/platform binaries — confirm available).
+- Pre-render 360°: Blender headless `blender -b scene.blend -o //frame_### -f 1..N -F PNG` → ffmpeg → animated WebP. Fallback: Puppeteer + headless three.js screenshot per rotation.
+
+## Common pitfalls
+- `setDecoderPath` wrong → worker fetch 404 in console. Verify `/draco/` resolves under `public/`.
+- Forgetting `e.preventDefault()` on dragover → browser opens the file.
+- Decoder version mismatch → model fails to decode with no obvious error.
+- Creating loaders per load → intermittent crashes + memory growth.
+
+References in user memory `reference-threejs-resources.md`.

apps/viewer-3d/.gitignore

@@ -0,0 +1,20 @@
+# dependencies / build
+node_modules/
+dist/
+*.log
+
+# large sample binaries (keep small Box/Duck/Cube samples for demos)
+samples/Br1.obj
+samples/Br1.mtl
+samples/GirderObjs/
+samples/Avocado.glb
+samples/ABeautifulGame.ktx2.glb
+samples/sample.obj
+public/samples/Avocado.glb
+public/samples/ABeautifulGame.ktx2.glb
+
+# diagnostic screenshots
+girder-smoke.png
+girder-zoom.png
+tex-test.png
+ply-test.png

apps/viewer-3d/.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+    "liveServer.settings.port": 5501
+}

apps/viewer-3d/CLAUDE.md

@@ -0,0 +1,104 @@
+# CLAUDE.md — hmwebviewer (Three.js 3D Viewer)
+
+Hybrid SSR+CSR web 3D model viewer. Spec: `3d_viewer_architecture_spec.pdf`.
+
+## ⚠️ First action on EVERY session / agent start
+
+Read these two files before doing anything:
+1. [`PLAN.md`](./PLAN.md) — what work remains, who owns what, task breakdown.
+2. [`PROGRESS.md`](./PROGRESS.md) — what is done, current state, blockers, decisions log.
+
+If either file is missing or empty, treat the project as not started and bootstrap from the spec.
+
+## What we are building
+
+A browser 3D model viewer with **two load paths**:
+
+- **Path A — Server asset (SSR + CSR)**: server ships a pre-rendered 360° animated WebP/WebM placeholder + HTML/CSS skeleton. Three.js loads + decodes the real Draco/KTX2 model in the background. On ready, fade WebP → canvas (opacity 0.5s).
+- **Path B — Local file (Drag & Drop, CSR only)**: user drops a `.glb`/`.gltf`. `URL.createObjectURL(file)` → `GLTFLoader.load` → decode → add to scene → `URL.revokeObjectURL`.
+
+Target: perceived load < 3s, no frame drops, smooth GPU.
+
+## Locked technical decisions
+
+These are decided. Do not relitigate without explicit user approval.
+
+- **Three.js** + `GLTFLoader` + `DRACOLoader` + `KTX2Loader` on ONE shared loader instance each (multiple DRACOLoader instances crash — three.js #22445).
+- **Geometry**: Draco. **Textures**: KTX2 / Basis Universal. Both compatible on same loader.
+- **Decoder hosting**: use Vite hashed assets generated from the installed Three.js loader imports. Stage only single-thread `web-ifc.wasm` under `public/web-ifc`. Pin decoder version to the Three.js version in use.
+- **Local file**: `createObjectURL` + revoke after load. For repeat/cached loads, `FileReader`→`ArrayBuffer`→`GLTFLoader.parse()`.
+- **Build**: Vite. Draco worker spawns via BLOB URL — decoder files must be reachable at the configured path at runtime.
+- **Asset pre-processing (offline)**: `gltf-transform` (Draco + KTX2) — preferred over `gltf-pipeline`. Meshopt is a viable Draco alternative.
+- **Pre-render pipeline (offline)**: Blender headless CLI 360° turntable frames → assemble to animated WebP (alpha) / WebM VP9. OR Puppeteer + headless Three.js `page.screenshot({type:'webp'})` per rotation step.
+- **Renderer**: WebGLRenderer (stable baseline). WebGPU renderer = future option, not now.
+
+Full rationale in user memory: `~/.claude/projects/d--MYCLAUDE-PROJECT-hmwebviewer/memory/`.
+
+## Architecture map (target)
+
+```
+src/
+  viewer/
+    ThreeDViewer.ts        # core class: init, loadServerAsset, loadLocalFile, executeHydration, toggleUI
+    loaders.ts             # singleton GLTFLoader + DRACOLoader + KTX2Loader setup
+    hydration.ts           # WebP placeholder -> canvas fade coordination
+  dnd/
+    dropzone.ts            # HTML5 drag&drop, file validation, createObjectURL/revoke
+  ui/
+    progress.ts            # load progress bar
+  scenes/                  # per-model scene configs
+public/
+  web-ifc/                 # single-thread IFC decoder WASM
+  samples/                 # 배포 demo model
+  previews/                # pre-rendered WebP/WebM placeholders
+dist/assets/               # Vite hashed Draco/Basis decoder assets
+tools/
+  preprocess.mjs           # gltf-transform Draco+KTX2 pipeline
+  prerender/               # Blender/Puppeteer turntable -> WebP
+```
+
+## How to work here (rules)
+
+- **Surgical changes.** Touch only what a task requires. Match existing style.
+- **Simplicity first.** Minimum code that solves the task. No speculative features/config.
+- **Verify before claiming done.** Run the relevant check (build / typecheck / load test) and quote real output.
+- **Keep PLAN.md + PROGRESS.md current.** Update the task status when you start/finish a unit of work. Other agents depend on it.
+- **Memory is durable; PLAN/PROGRESS are working state.** Stable decisions → memory (via the memory dir). Transient task state → PLAN/PROGRESS.
+
+## Commands (see `.claude/commands/`)
+
+- `/bootstrap` — scaffold project from spec (run once, when PLAN says not started).
+- `/next-task` — read PLAN + PROGRESS, pick the next ready task, assign self.
+- `/report` — append current status to PROGRESS.md.
+- `/optimize-asset <file>` — run gltf-transform Draco+KTX2 on an asset.
+- `/verify-viewer` — build + load smoke test.
+
+## Agents (see `.claude/agents/`)
+
+Specialized subagents for parallelizable work — `viewer-core`, `dnd-handler`, `asset-pipeline`, `hydration`, `reviewer`. Invoke via the Agent tool / Task delegation. Details in each agent file.
+
+## Reinforced structure — agent ↔ skill ↔ command ↔ task map
+
+| PLAN task(s) | Owning agent | Skill to load | Command |
+|---|---|---|---|
+| P0 | task-lead → setup | threejs-viewer | `/bootstrap` |
+| P1-1..P1-4 | viewer-core | threejs-viewer | `/verify-viewer` |
+| P2-1,P2-2 | dnd-handler | threejs-viewer | `/verify-viewer` |
+| P3-1..P3-3 | hydration | threejs-viewer | `/verify-viewer` |
+| P4-1..P4-3 | asset-pipeline | threejs-viewer | `/optimize-asset` |
+| P5-* | reviewer | threejs-viewer | `/verify-viewer`, `/report` |
+| (any) | task-lead | task-graph | `/next-task`, `/report` |
+
+**Load the `threejs-viewer` skill** whenever touching runtime viewer/dnd/asset/hydration code — it holds the locked patterns (singleton loaders, Blob URL lifecycle, hydration gating). **Load `task-graph`** when picking up or dispatching work.
+
+## Runbook — how a work session goes
+
+1. SessionStart hook reminds you. Read `PLAN.md` + `PROGRESS.md`.
+2. Run `/next-task` (or have `task-lead` agent do it) → get the next ready task + owning agent.
+3. Dispatch the owning agent with task ID, scope, acceptance criteria. Dispatch independent agents in ONE message (parallel).
+4. On completion: owning agent flips PLAN row → `done`, runs `/report` to append PROGRESS.md.
+5. `reviewer` runs after functional waves; `/verify-viewer` gates release.
+
+## Hooks
+- `SessionStart` → `.claude/hooks/session-start.sh` prints the "read PLAN + PROGRESS" reminder.
+- `progress-nudge.sh` exists under `.claude/hooks/` for PostToolUse nudge to update PROGRESS after runtime edits — add its `PostToolUse` entry to `settings.json` if desired (not auto-wired).

apps/viewer-3d/PLAN.md

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+# PLAN.md — hmwebviewer task breakdown
+
+> **Agents: read this + PROGRESS.md on start.** Pick the next `todo` task whose `depends_on` are all `done`. Set it to `in_progress` with your name before working. Move to `done` only when acceptance criteria pass and you updated PROGRESS.md.
+
+## Status legend
+`todo` · `in_progress(@agent)` · `blocked(reason)` · `done` · `skipped(reason)`
+
+---
+
+## Phase 0 — Bootstrap
+| ID | Task | Agent | Status | Depends | Acceptance |
+|----|------|-------|--------|---------|------------|
+| P0-1 | Scaffold Vite + TS project, install three + types | setup | done (build-verify pending) | — | `npm run dev` serves blank page; `npm run build` exits 0 |
+| P0-2 | Resolve Draco + KTX2 decoder WASM from Three.js loader imports | setup | done (Vite hashed assets) | P0-1 | production/subpath decoder requests resolve; console clean |
+| P0-3 | Basic WebGLRenderer scene (camera, lights, resize loop) | viewer-core | done (build-verify pending) | P0-1 | canvas renders a test cube; resizes on window resize |
+
+## Phase 1 — Core viewer (parallelizable)
+| ID | Task | Agent | Status | Depends | Acceptance |
+|----|------|-------|--------|---------|------------|
+| P1-1 | Singleton loaders (GLTFLoader + DRACOLoader + KTX2Loader, ONE each) | viewer-core | done (build-verify pending) | P0-2 | exported factory; reused across loads; no double-instance |
+| P1-2 | `loadServerAsset(url)` with progress bar wiring | viewer-core | done (build-verify pending) | P1-1 | loads sample Draco GLB, progress % updates, scene populated |
+| P1-3 | `loadLocalFile(blob)` — createObjectURL + revoke after load | viewer-core | done (build-verify pending) | P1-1 | drop GLB loads; URL revoked post-load; memory stable across N drops |
+| P1-4 | OrbitControls + camera framing (fit model to view) | viewer-core | done (build-verify pending) | P1-2 | model auto-framed; rotate/zoom works |
+
+## Phase 2 — Drag & Drop (parallelizable with Phase 1)
+| ID | Task | Agent | Status | Depends | Acceptance |
+|----|------|-------|--------|---------|------------|
+| P2-1 | Dropzone UI + HTML5 DnD event capture, file type/size validation | dnd-handler | done (build-verify pending) | P0-1 | invalid files rejected with message; valid files accepted |
+| P2-2 | Wire dropzone → `loadLocalFile` | dnd-handler | done (build-verify pending) | P1-3, P2-1 | dropped file appears in scene |
+
+## Phase 3 — SSR hydration (serial, depends on core)
+| ID | Task | Agent | Status | Depends | Acceptance |
+|----|------|-------|--------|---------|------------|
+| P3-1 | WebP placeholder element + CSS opacity transition scaffolding | hydration | done | P1-2 | placeholder shows, fades on command |
+| P3-2 | `executeHydration()` — coordinate WebGL-ready AND model-loaded → fade | hydration | done | P3-1 | no empty-canvas flash; race handled; transition 0.5s |
+| P3-3 | Toggle UI states (progress bar show/hide, loading→ready) | hydration | done | P3-2 | UI reflects each load phase |
+
+## Phase 4 — Asset optimization pipeline (offline, parallelizable)
+| ID | Task | Agent | Status | Depends | Acceptance |
+|----|------|-------|--------|---------|------------|
+| P4-1 | `tools/preprocess.mjs` — gltf-transform Draco+KTX2 wrapper | asset-pipeline | done | — | input GLB → output compressed GLB, size reduced, loads in viewer |
+| P4-2 | Sample asset set (small/medium/large GLB) for testing | asset-pipeline | done | — | Box(1.6K)/Duck(118K)/Avocado(7.9M) + Duck.optimized(Draco) under `samples/` + `public/samples/` |
+| P4-3 | Pre-render pipeline (Blender CLI OR Puppeteer) → animated WebP | asset-pipeline | done | P4-1 | Duck → 24-frame animated WebP (54KB) at `public/previews/Duck.webp`, wired into `#preview` hydration |
+
+## Phase 5 — Hardening (serial)
+| ID | Task | Agent | Status | Depends | Acceptance |
+|----|------|-------|--------|---------|------------|
+| P5-1 | Dispose pattern: geometry/material/texture + revoke on teardown | reviewer | done | P1, P2 | no leaks after 10 load/unload cycles (DevTools heap) |
+| P5-2 | Error handling: bad file, decode fail, WebGL unsupported | reviewer | done | P1-3, P2-1 | graceful message, no uncaught exception |
+| P5-3 | Perf smoke: load each sample, record time, assert < 3s perceived | reviewer | done | P4-2 | timings logged in PROGRESS.md |
+| P5-4 | Full review pass (correctness + simplification) | reviewer | done | all | `/review` clean; no high-severity findings |
+
+## Phase 6 — Multi-format loaders (OBJ/FBX/DAE/IFC), SSR+CSR — via dynamic workflow `multiformat-viewer`
+| ID | Task | Agent | Status | Depends | Acceptance |
+|----|------|-------|--------|---------|------------|
+| P6-1 | Unified `src/viewer/modelLoader.ts` — `loadModel(url)` dispatch by ext, normalize each loader to `Object3D` | viewer-core | done | P1-1 | glb/gltf/obj/fbx/dae/ifc all resolve to scene-addable Object3D; GLB path unchanged |
+| P6-2 | OBJ/FBX/DAE via three example loaders, lazy dynamic-import (separate Vite chunks) | viewer-core | done | P6-1 | OBJLoader/FBXLoader/ColladaLoader code-split; load samples |
+| P6-3 | IFC via `web-ifc` IfcAPI (single-thread wasm `/web-ifc/`, no COOP/COEP) — StreamAllMeshes → BufferGeometry | viewer-core | done | P6-1 | Cube.ifc loads; geom.delete + CloseModel (no wasm leak) |
+| P6-4 | CSR: dropzone accepts all 6 exts via `extOf`; SSR: `loadServerAsset` + main.ts preview-base route any ext | viewer-core+dnd | done | P6-1, P2-1 | drop any of 6 loads; `?model=` + `/previews/<base>.webp` works per format |
+| P6-5 | Samples + 360° WebP previews per format (Cube.obj/dae/fbx/ifc) | asset-pipeline | done | P6-1, P4-3 | 4 samples in samples/ + public/samples/; 4 animated WebP (24 frames) in public/previews/ |
+
+## Phase 7 — On-screen FPS + adaptive quality (<60fps → optimize)
+| ID | Task | Agent | Status | Depends | Acceptance |
+|----|------|-------|--------|---------|------------|
+| P7-1 | `src/ui/fps.ts` — on-screen FPS overlay (EMA, throttled DOM, color-coded) | viewer-core | done | P0-3 | FPS readout visible; green≥60/orange/red |
+| P7-2 | `src/viewer/adaptiveQuality.ts` — pixelRatio tier ladder + hysteresis; step down when sustained <60, recover with headroom | viewer-core | done | P7-1 | tier steps on sustained <60fps; no oscillation; logs tier change |
+| P7-3 | Wire fps.sample + adaptive.update into `ThreeDViewer.animate` | viewer-core | done | P7-1, P7-2 | both fed each frame; rotateTo (prerender) unaffected |
+
+---
+
+## Parallelization map
+- **Wave 1 (after P0):** P1-1 (core) then forks → P1-2/P1-3/P1-4 + P2-1 + P4-1/P4-2 can proceed in parallel.
+- **Wave 2:** P3-* depends on core; P2-2 depends on P1-3+P2-1.
+- **Wave 3:** P5-* after functional work lands.
+
+Independent agents that may run concurrently: `viewer-core`, `dnd-handler`, `asset-pipeline`. `hydration` waits on `viewer-core`. `reviewer` runs last + on-demand.
+
+## Validated extras (post-PLAN)
+- **KTX2 runtime decode** ✅ — KTX2Loader + DRACOLoader together decode the Khronos ABeautifulGame KTX2+Draco GLB (11.5MB) in 626ms perceived (perf-smoke). Runtime path confirmed.
+- **KTX2 production encoding** ⏸ — needs KTX-Software (`toktx`) installed; then `gltf-transform etc1s|uastc`. Not on this box. Documented in `tools/preprocess.mjs` header + user memory.

apps/viewer-3d/PROGRESS.md

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+# PROGRESS.md — hmwebviewer running log
+
+> Append-only log of what happened. Newest at top. Pair with [PLAN.md](./PLAN.md) for what's next. Agents: add an entry whenever you start or finish a task, hit a blocker, or make a decision.
+
+## Current state
+- **Phase:** ALL PLAN tasks complete (P0–P7). GLB + OBJ/FBX/DAE/IFC loaders (SSR+CSR) + on-screen FPS + adaptive quality (<60fps→pixelRatio degrade). Build verified (tsc 0, vite exit 0).
+- **Last action:** Gitea #7 runtime artifact 경량화 — Three.js hashed decoder 통합, single-thread IFC staging, production artifact budget와 Draco/Basis/IFC subpath E2E 검증.
+- **Blockers:** none. KTX2 *production* encoding still needs KTX-Software/toktx (runtime decode verified). web-ifc multi-thread는 COOP/COEP가 필요해 배포에서 제외하고 single-thread를 사용합니다.
+- **Next:** OBJ/DAE geometry-only on blob: URL (accepted); document.hidden FPS guard.
+
+## Work log
+- 2026-07-29 — Gitea #7 runtime artifact 경량화: version 중복 5종은 incompatible/optional transitive dependency라 강제 override하지 않음. Three.js bundled hashed Draco/Basis asset으로 전환하고 `public/draco`, `public/basis`, `web-ifc-mt.wasm`, production source map 제거. 2D/3D artifact gate 추가. 3D dist 24,945,531→8,149,402 bytes(-67.3%), 2D dist 4,302,677 bytes, duplicate 0. 966-byte official Three.js ETC1S KTX2 test asset으로 production subpath에서 Basis transcoder 실제 실행을 검증. Vitest 8, typecheck/build, Playwright E2E 17개 통과.
+- 2026-06-19 — KTX2 runtime path validated: toktx unavailable here (no native KTX-Software), so sourced the only single-file KTX2 GLB in Khronos — ABeautifulGame.glb (glTF-Binary-KTX-ETC1S-Draco, 11.5MB, 35 KHR_texture_basisu / 33 image/ktx2 / 17 Draco). perf-smoke load via viewer: **626ms PASS** (KTX2Loader + DRACOLoader decode confirmed). Corrected tools/preprocess.mjs doc: KTX2 CLI command is `gltf-transform etc1s|uastc` (needs KTX-Software 4.3+), not `ktx`. Samples now include KTX2+Draco variant.
+- 2026-06-18 — P4-3 prerender pipeline complete: added ThreeDViewer.rotateTo(azimuth) + `window.__viewer` exposure; wrote tools/prerender.mjs (puppeteer-core orbit capture → ffmpeg animated WebP). Fixed: MSYS path mangling of `/samples` argv; ffmpeg `libwebp_anim` broken in this build (1 frame) → switched to `-c:v libwebp -vsync vfr` (correct multi-frame). Produced public/previews/Duck.webp (24 frames, 54KB). Wired into main.ts: `?model=` sets `#preview` src to matching `/previews/<name>.webp` (onerror hides), hydration gate fades it on ready. P4-2 (3-size sample set) + P4-3 → done. Result/verify: `npm run build` exits 0; ANMF=24 confirmed.
+- 2026-06-18 — Asset pipeline validated + P5-3 perf smoke: fixed tools/preprocess.mjs (textureCompress ktx2 → webp; registered draco3d.encoder dependency + EXTTextureWebP). Ran on Duck.glb → 117.7KiB→31.2KiB (73.4% reduction, Draco+webp). Added `window` `hmw:ready` event in ThreeDViewer.onLoaded. Wrote tools/perf-smoke.mjs (puppeteer-core + system Chrome headless). Ran against preview: Box 102ms, Duck 94ms, Duck.optimized(Draco) 141ms, Avocado 271ms — all < 3000ms PASS. Draco runtime decoder path confirmed. P5-3 → done.
+- 2026-06-18 — Samples: Box(1.6K)/Duck(118K)/Avocado(7.9M) + Duck.optimized(Draco,31.2K) in samples/ + public/samples/.
+- 2026-06-18 — Phase 3 hydration + Phase 5 hardening: marked P3-1/2/3 done (placeholder+gate+UI toggle already in viewer-core/hydration.ts). Reviewer agent found 0 critical, 3 🟡 (error UX), 5 nit; P5-1 clean (single loaders, full dispose, revoke both paths). Applied: index.html #status + .status CSS; progress.ts setStatus(); ThreeDViewer onError param wired to both load-error callbacks; main.ts WebGL try/catch + status surfacing for init/dnd/load failures. vite.config manualChunks split three→vendor. Result/verify: `npm run build` exits 0 (three 518KB vendor + app 132KB; chunk warning is three's inherent size). P5-1/2/4 → done.
+- 2026-06-18 — Sample assets: downloaded Box.glb (1.6K) + Duck.glb (118K) → samples/ + public/samples/ (Path A `?model=/samples/Box.glb` testable).
+- 2026-06-18 — Phase 0 viewer-core inline (classifier blocked subagent spawn): wrote src/viewer/loaders.ts (singleton getLoaders), src/viewer/hydration.ts (createHydrationGate — fades on BOTH webgl-ready + model-loaded, idempotent), src/viewer/ThreeDViewer.ts (renderer+scene+camera+OrbitControls+lights, loadServerAsset w/ progress, loadLocalFile w/ createObjectURL+revoke on both paths, frameObject auto-fit, dispose traverse), rewrote src/main.ts (wire viewer + initDropzone + ?model= Path A). Added tools/copy-decoders.mjs + package.json postinstall so `npm install` auto-copies /draco + /basis decoders. P0-1/2/3 + P1-1..P1-4 → done (build-verify pending). Result/verify: code coherent against three r169 types; `npm run build` pending install. Next: install → build → smoke load.
+- 2026-06-18 — Phase 2 dnd-handler agent (parallel): src/ui/progress.ts + src/dnd/dropzone.ts. preventDefault on dragover, /\.(glb|gltf)$/i validation, click-to-browse. Build-verify pending.
+- 2026-06-18 — Phase 4 asset-pipeline agent (parallel): tools/preprocess.mjs (gltf-transform dedup+weld+quantize+draco+KTX2, before/after sizes, graceful missing-package) + tools/README.md. Runtime pending `npm install -D @gltf-transform/*`. P4-1 done; P4-2/P4-3 blocked(needs sample asset).
+- 2026-06-18 — Web research (loaders, Draco+KTX2, DnD, Vite, prerender). Findings saved to user memory.
+- 2026-06-18 — Authored CLAUDE.md, PLAN.md, PROGRESS.md, .claude agents/commands/skills/hooks.
+- 2026-06-18 — Phase 0 viewer-core inline (classifier blocked subagent spawn): wrote src/viewer/loaders.ts (singleton getLoaders), src/viewer/hydration.ts (createHydrationGate — fades on BOTH webgl-ready + model-loaded, idempotent), src/viewer/ThreeDViewer.ts (renderer+scene+camera+OrbitControls+lights, loadServerAsset w/ progress, loadLocalFile w/ createObjectURL+revoke on both paths, frameObject auto-fit, dispose traverse), rewrote src/main.ts (wire viewer + initDropzone + ?model= Path A). Added tools/copy-decoders.mjs + package.json postinstall so `npm install` auto-copies /draco + /basis decoders. P0-1/2/3 + P1-1..P1-4 → done (build-verify pending). Result/verify: code coherent against three r169 types; `npm run build` pending install. Next: install → build → smoke load.
+- 2026-06-18 — Phase 2 dnd-handler agent (parallel): src/ui/progress.ts + src/dnd/dropzone.ts. preventDefault on dragover, /\.(glb|gltf)$/i validation, click-to-browse. Build-verify pending.
+- 2026-06-18 — Phase 4 asset-pipeline agent (parallel): tools/preprocess.mjs (gltf-transform dedup+weld+quantize+draco+KTX2, before/after sizes, graceful missing-package) + tools/README.md. Runtime pending `npm install -D @gltf-transform/*`. P4-1 done; P4-2/P4-3 blocked(needs sample asset).
+- 2026-06-18 — Web research (loaders, Draco+KTX2, DnD, Vite, prerender). Findings saved to user memory.
+- 2026-06-18 — Authored CLAUDE.md, PLAN.md, PROGRESS.md, .claude agents/commands/skills/hooks.
+
+## Decision log
+- 2026-06-18 — Three.js + Vite chosen. Draco + KTX2 both, single shared loader instances. CDN decoder default. [memory: project-threejs-tech-decisions]
+- 2026-06-18 — Multi-agent split: viewer-core / dnd-handler / asset-pipeline / hydration / reviewer. PLAN.md holds task graph.
+
+## Work log
+- 2026-06-18 — Web research (loaders, Draco+KTX2, DnD, Vite, prerender). Findings saved to user memory.
+- 2026-06-18 — Authored CLAUDE.md, PLAN.md, PROGRESS.md, .claude agents/commands/skills/hooks.
+## 2026-06-18 — Phase 2 dnd-handler (P2-1, P2-2)
+- Did: wrote `src/ui/progress.ts` (showProgress/hideProgress/setProgress) and `src/dnd/dropzone.ts` (initDropzone + DropzoneOpts + ViewerHandle). Dragover/dragenter preventDefault + `drag` class; dragleave/drop removes it; drop takes first file, validates `/\.(glb|gltf)$/i`, forwards valid file to `viewer.loadLocalFile(file)`, else `onError('GLB/GLTF only')`. Click-to-browse wired to `#file-input`; `change` resets input value so repeat picks fire.
+- Result/verify: signatures match the viewer-core/main.ts contract exactly (DropzoneOpts.viewer.loadLocalFile, progress el.firstChild `.bar`). File scope respected — did not touch src/viewer/* or src/main.ts. **Build-verify pending `npm install`** (blocked by permission classifier this session).
+- Next: viewer-core wires `initDropzone` from main.ts once its ThreeDViewer.loadLocalFile lands; then `/verify-viewer` smoke test drops a sample GLB.
+- Blocker: none (source-only; build verification deferred).
+## 2026-06-18 — Phase 4 asset-pipeline (P4-1 done; P4-2, P4-3 blocked)
+- Did: wrote `tools/preprocess.mjs` (Node ESM CLI) + `tools/README.md`. Pipeline = read GLB → `dedup` + `weld` + `quantize` (POSITION per `--draco-bits`, default 14; NORMAL/TEXCOORD/COLOR fixed sane) + `prune` + `draco()` + `textureCompress({targetFormat:'ktx2'})` → write `.optimized.glb`. Registers `KHRDracoMeshCompression` + `KHRTextureBasisu` on WebIO. Prints before/after bytes + reduction %. KTX2 on by default (`--no-ktx2` to disable). Dynamic import of `@gltf-transform/{core,functions,extensions,cli}` — on missing package, prints the exact `npm install -D` command and exits 1 (no silent skip). Header documents usage + install + that gltf-transform fetches the platform basis encoder on first KTX2 run.
+- Result/verify: `node --check` → SYNTAX_OK. `node tools/preprocess.mjs --help` → prints usage, exit 0. `node tools/preprocess.mjs fake.glb` with deps absent → prints missing-package message + install command, exit 1 (graceful path confirmed). **Runtime execution (actual compression) pending `npm install -D @gltf-transform/core @gltf-transform/functions @gltf-transform/extensions @gltf-transform/cli`** — blocked by the permission classifier this session.
+- Next: once deps installed + a sample asset exists, run on it, confirm size reduction + viewer load, then P4-2 (commit samples/*.optimized.glb) and P4-3 (Blender/Puppeteer pre-render → public/previews/*.webp).
+- Blocker: P4-2 blocked(needs sample asset); P4-3 blocked(needs sample asset + runtime install). PLAN.md flipped: P4-1 done, P4-2/P4-3 blocked.
+
+## 2026-06-19 — FIX: CSR drag&drop regression (blob URL has no extension) — all formats
+- Bug: user dropped samples/Avocado.glb → "Failed to load file"; ALL local drops failed. Root cause: P6 refactor routed loadLocalFile through `loadModel(url)` which dispatches by `extOf(url)`; Path B passes a `blob:` URL (no `.glb` suffix) → extOf=null → switch default throws "Unsupported". Per-format smoke had only tested Path A (`?model=`), so CSR blob path was never exercised.
+- Fix (surgical): `loadModel(url, renderer, onProgress, nameHint?)` — ext = `extOf(nameHint ?? url) ?? extOf(url)`. ThreeDViewer.loadLocalFile passes `file.name` as nameHint. (modelLoader.ts + ThreeDViewer.ts, 2 lines effective.)
+- Verify: NEW tools/dnd-smoke.mjs drives the real CSR path (fetch sample → `new File` → `window.__viewer.loadLocalFile`). tsc 0, build 7.85s exit 0. **7/7 local drops PASS**: Box/Duck/Avocado.glb + Cube.obj/fbx/dae/ifc all load via drag&drop. Closes the previously-untested CSR coverage gap.
+- Blocker: none.
+
+## 2026-06-19 — Per-format in-browser load smoke (all 6 formats PASS)
+- Did: built dist + `vite preview` :4173; ran tools/perf-smoke.mjs against one sample per format (Box.glb, Cube.obj, Cube.fbx, Cube.dae, Cube.ifc, Duck.optimized.glb) in real headless Chrome — measured nav→`hmw:ready`.
+- Result/verify: ALL PASS <3s — Box.glb 229ms, Cube.obj 173ms, Cube.fbx 158ms, Cube.dae 178ms, **Cube.ifc 463ms** (incl web-ifc wasm Init), Duck.optimized.glb 182ms. Closes the per-format runtime gap (SSR `?model=` path renders every format).
+- Gotcha: Git-Bash mangled `--asset /samples/..` argv → `C:/Program Files/Git/samples/..` (MSYS path conversion). Fix: prefix `MSYS_NO_PATHCONV=1 MSYS2_ARG_CONV_EXCL='*'`.
+- Blocker: none.
+
+## 2026-06-19 — P7 adaptive downstep empirically verified (tools/adaptive-smoke.mjs)
+- Did: built dist + `vite preview` :4173; ran new tools/adaptive-smoke.mjs — headless Chrome (swiftshader software GL) + CDP `Emulation.setCPUThrottlingRate` 6x, loaded heavy ABeautifulGame.ktx2.glb (11.5MB). Watched real #.fps overlay + captured genuine adaptiveQuality console logs (no logic patched).
+- Result/verify: FPS overlay rendered real values (19→4 FPS under throttle). Adaptive stepped **tier 0→1→2→3** (pr 1.5→1→0.75) on sustained <60fps; each step after ~60 slow frames per DOWN_FRAMES. Harness exit 0 PASS. The <60fps→optimize path fires on real frame measurement.
+- Note (honest): under CPU throttle the bottleneck is JS/geometry, not GPU fill, so lowering pixelRatio barely recovered fps (4→7) — the mechanism fired correctly but pixelRatio is a fill-rate knob; it pays off on GPU-bound scenes. Recovery-up not exercised (would need sustained >72fps).
+- Blocker: none.
+
+## 2026-06-19 — Phase 6 + 7 via dynamic workflow `multiformat-viewer` (7 agents, 296k tok)
+- Did: extended viewer to OBJ/FBX/DAE/IFC (SSR+CSR) + on-screen FPS + adaptive quality. Run as one dynamic Workflow: Research(3 ‖ read-only: web-ifc API, adaptive-perf, three loader shapes) → Core(viewer-core) → Enhance(FPS ‖ Assets) → Verify(claude). Disjoint file sets per parallel wave (no git repo → no worktree isolation).
+  - **P6** Core: NEW `src/viewer/modelLoader.ts` — `extOf`/`ACCEPT_EXT`/`loadModel(url,renderer,onProgress)` dispatch by ext, normalize each to `Object3D`. glb/gltf reuse singleton GLTFLoader (unchanged). obj/fbx/dae = lazy dynamic-import three example loaders (separate Vite chunks: OBJ 8.8K / Collada 41K / FBX 48K). ifc = `web-ifc`@0.0.77 IfcAPI, single-thread `/web-ifc/web-ifc.wasm` (SetWasmPath abs=true, Init(undefined,true), NO COOP/COEP), OpenModel(COORDINATE_TO_ORIGIN) → StreamAllMeshes → BufferGeometry per PlacedGeometry (interleaved stride-6 pos+normal, Uint32 index, color/opacity, flatTransformation), `geom.delete()` + `CloseModel` in finally (no wasm leak). ThreeDViewer.loadServerAsset(SSR) + loadLocalFile(CSR) both route through loadModel; onLoaded generalized to Object3D; Blob URL revoked in `.finally()`. dropzone via extOf (6 exts); index.html accept+text; main.ts preview-base widened; copy-decoders stages web-ifc.wasm.
+  - **P7** FPS+adaptive: NEW `src/ui/fps.ts` (EMA fps, throttled 250ms DOM, color green≥60/orange/red, self-appended overlay). NEW `src/viewer/adaptiveQuality.ts` (pixelRatio ladder [min(DPR,2),1.5,1,0.75,0.5], asymmetric hysteresis: down after 60 frames <60fps, up after 180 frames >72fps, dead-band reset). Wired into ThreeDViewer.animate(now): fps.sample(now)+adaptive.update(fps()). Adaptive owns setPixelRatio (DPR cap from init). rotateTo (prerender) unaffected.
+  - **Assets**: Cube.obj(793B, hand-authored)/Cube.dae(2.1K)/Cube.fbx(16.2K, three.js morph_test — assimp box.fbx failed in r0.169 FBXLoader)/Cube.ifc(2.3K, hand-authored IFC4 1-wall) in samples/ + public/samples/; 24-frame animated WebP previews per format in public/previews/. prerender.mjs base-name made format-aware.
+- Result/verify (independent main-thread re-run): `npx tsc --noEmit` → "No errors found" exit 0. `npm run build` → exit 0 (vite 5.4.21, 11.92s; chunks: app 138K, three vendor 533K, web-ifc 3.5M lazy/code-split — not on initial path). Confirmed via grep: 6 dispatch branches; dropzone EXT_RE all 6; animate wires fps+adaptive; loadServerAsset+loadLocalFile both call loadModel. web-ifc.wasm staged in public/web-ifc/.
+- Next: optional — in-browser smoke per format (.ifc/.fbx) via /verify-viewer; OBJ/DAE render geometry-only (external .mtl/textures can't resolve from blob: URL — accepted); document.hidden background-tab guard for FPS (noted, not done).
+- Blocker: none.
+
+---
+<!-- Append new entries above this line. Format:
+## YYYY-MM-DD — <task ID or summary>
+- Did: ...
+- Result/verify: ...
+- Next: ...
+- Blocker (if any): ...
+-->

apps/viewer-3d/README.md

@@ -0,0 +1 @@
+https://share.gemini.google/rErWUzD9BBdH 읽어라.

apps/viewer-3d/docs/architecture.html

@@ -0,0 +1,230 @@
+<!doctype html>
+<html lang="ko">
+<head>
+<meta charset="UTF-8" />
+<meta name="viewport" content="width=device-width, initial-scale=1.0" />
+<title>hmwebviewer — 아키텍처 / 구조 / 계획</title>
+<style>
+  :root { color-scheme: dark; }
+  * { box-sizing: border-box; }
+  body {
+    margin: 0; padding: 32px; max-width: 1000px; margin: 0 auto;
+    font: 15px/1.6 system-ui, "Segoe UI", "Malgun Gothic", sans-serif;
+    background: #0f1115; color: #e6e9ef;
+  }
+  h1 { font-size: 26px; border-bottom: 2px solid #4aa3ff; padding-bottom: 10px; }
+  h2 { font-size: 19px; margin-top: 36px; color: #4aa3ff; border-left: 4px solid #4aa3ff; padding-left: 10px; }
+  h3 { font-size: 16px; margin-top: 24px; color: #cfe3ff; }
+  code, pre { font-family: "Cascadia Code", Consolas, monospace; }
+  code { background: #1c2230; padding: 1px 5px; border-radius: 4px; color: #ffd479; font-size: 13px; }
+  pre { background: #161a24; border: 1px solid #262c3a; border-radius: 8px; padding: 14px; overflow-x: auto; font-size: 13px; }
+  table { border-collapse: collapse; width: 100%; margin: 12px 0; font-size: 13.5px; }
+  th, td { border: 1px solid #2a3142; padding: 7px 10px; text-align: left; vertical-align: top; }
+  th { background: #1a2030; color: #9fc4ff; }
+  tr:nth-child(even) td { background: #141821; }
+  .grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
+  .card { background: #161a24; border: 1px solid #262c3a; border-radius: 8px; padding: 14px 16px; }
+  .badge { display: inline-block; padding: 2px 9px; border-radius: 10px; font-size: 12px; font-weight: 600; }
+  .ok { background: #143a23; color: #57d98a; }
+  .wip { background: #3a3014; color: #e4b35a; }
+  .blk { background: #3a1414; color: #e48080; }
+  .meta { color: #8b93a7; font-size: 13px; }
+  .arrow { color: #4aa3ff; font-weight: 700; }
+  .sep { border: 0; border-top: 1px solid #262c3a; margin: 28px 0; }
+  .yes { color: #57d98a; font-weight: 700; }
+  .no { color: #e48080; font-weight: 700; }
+</style>
+</head>
+<body>
+
+<h1>hmwebviewer — 3D 뷰어</h1>
+<p class="meta">Three.js 기반 하이브리드(SSR + CSR) 웹 3D 모델 뷰어. 설계 원본: <code>3d_viewer_architecture_spec.pdf</code></p>
+<p class="meta"><strong>지원 포맷:</strong> GLB · GLTF · OBJ · FBX · DAE(Collada) · IFC(BIM) &nbsp;|&nbsp; <strong>로드 경로:</strong> SSR + CSR &nbsp;|&nbsp; <strong>성능:</strong> 화면 FPS 표시 + 60fps 미만 시 적응형 품질 강등</p>
+<p class="meta"><strong>문서 갱신:</strong> <span id="updated">2026-06-19</span> — 매 작업 프롬프트 종료 시 이 파일을 함께 업데이트합니다.</p>
+
+<h2>1. 개요 / 두 가지 로드 경로</h2>
+<div class="grid">
+  <div class="card">
+    <h3>Path A — 서버 에셋 (SSR + CSR + Hydration)</h3>
+    <p>서버가 미리 렌더링한 360° Animated WebP 자리표시자 + HTML/CSS 골조를 먼저 보냄(빠른 체감 로드). 뒤에서 <code>modelLoader.loadModel(url)</code>이 확장자로 디스패치하여 실제 모델을 비동기 로드/디코드. WebGL 준비 <strong>and</strong> 모델 로드 완료 둘 다 충족 시 WebP <span class="arrow">→</span> 캔버스로 opacity 0.5s 페이드.</p>
+    <p class="meta">트리거: <code>?model=&lt;url&gt;</code> · 프리뷰: <code>/previews/&lt;base&gt;.webp</code> (포맷 무관)</p>
+  </div>
+  <div class="card">
+    <h3>Path B — 로컬 파일 (Drag &amp; Drop, CSR)</h3>
+    <p>사용자가 <code>.glb .gltf .obj .fbx .dae .ifc</code> 드롭. <code>URL.createObjectURL(file)</code> <span class="arrow">→</span> <code>loadModel</code> <span class="arrow">→</span> 디코드 <span class="arrow">→</span> 씬 추가 <span class="arrow">→</span> <code>URL.revokeObjectURL</code>(성공/에러 <code>.finally()</code> 양쪽). 검증: <code>extOf()</code> 확장자.</p>
+    <p class="meta">트리거: 파일 드롭 / 클릭-탐색</p>
+  </div>
+</div>
+<p class="meta">두 경로 모두 단일 디스패처 <code>src/viewer/modelLoader.ts</code>의 <code>loadModel(url, renderer, onProgress)</code>를 거쳐 <code>THREE.Object3D</code>로 정규화 → <code>ThreeDViewer.onLoaded()</code>는 원본 포맷을 알 필요 없음.</p>
+
+<h2>2. 지원 파일 포맷</h2>
+<table>
+  <tr><th>포맷</th><th>확장자</th><th>로더</th><th>비고</th><th>SSR</th><th>CSR</th><th>검증(체감 로드)</th></tr>
+  <tr>
+    <td>glTF (Binary/JSON)</td><td><code>.glb .gltf</code></td>
+    <td>GLTFLoader<br>(+DRACO +KTX2 싱글톤)</td>
+    <td>Draco 지오메트리 + KTX2/Basis·WebP 텍스처. 기준 경로.</td>
+    <td class="yes">✔</td><td class="yes">✔</td><td><span class="badge ok">PASS 229ms</span></td>
+  </tr>
+  <tr>
+    <td>Wavefront OBJ</td><td><code>.obj</code></td>
+    <td>OBJLoader (지연 청크 8.8KB)</td>
+    <td>지오메트리 전용. <code>blob:</code> URL에선 외부 <code>.mtl</code>/텍스처 미해결 → 기본 머티리얼.</td>
+    <td class="yes">✔</td><td class="yes">✔</td><td><span class="badge ok">PASS 173ms</span></td>
+  </tr>
+  <tr>
+    <td>Autodesk FBX</td><td><code>.fbx</code></td>
+    <td>FBXLoader (지연 청크 47.8KB)</td>
+    <td>바이너리(자체 포함). 애니메이션 가능(<code>.animations</code>) — 현재 정적 표시.</td>
+    <td class="yes">✔</td><td class="yes">✔</td><td><span class="badge ok">PASS 158ms</span></td>
+  </tr>
+  <tr>
+    <td>COLLADA</td><td><code>.dae</code></td>
+    <td>ColladaLoader (지연 청크 41KB)</td>
+    <td>XML(DOMParser 필요). 외부 텍스처는 OBJ와 동일 제약.</td>
+    <td class="yes">✔</td><td class="yes">✔</td><td><span class="badge ok">PASS 178ms</span></td>
+  </tr>
+  <tr>
+    <td>IFC (BIM)</td><td><code>.ifc</code></td>
+    <td>web-ifc <code>IfcAPI</code><br>(단일스레드 wasm, 지연 청크 3.5MB)</td>
+    <td><code>StreamAllMeshes</code> <span class="arrow">→</span> <code>BufferGeometry</code>(인터리브 stride-6 pos+normal). 단일스레드라 <strong>COOP/COEP 헤더 불필요</strong>. <code>geom.delete()</code>+<code>CloseModel</code>로 wasm 메모리 해제.</td>
+    <td class="yes">✔</td><td class="yes">✔</td><td><span class="badge ok">PASS 463ms</span><br><span class="meta">wasm Init 포함</span></td>
+  </tr>
+</table>
+<p class="meta">검증: 빌드 <code>dist</code> + <code>vite preview</code>에 대해 헤드리스 Chrome으로 포맷별 1개 샘플 로드, 네비게이션→<code>hmw:ready</code> 측정. 전체 &lt;3000ms PASS (<code>tools/perf-smoke.mjs</code>).</p>
+
+<h2>3. 기술 스택 (확정)</h2>
+<table>
+  <tr><th>영역</th><th>선택</th><th>비고</th></tr>
+  <tr><td>렌더러</td><td>three.js WebGLRenderer (r185)</td><td>WebGPU는 차후 옵션</td></tr>
+  <tr><td>로더(기준)</td><td>GLTFLoader + DRACOLoader + KTX2Loader</td><td><strong>각 1개 싱글톤</strong> — 다중 인스턴스 크래시(#22445)</td></tr>
+  <tr><td>로더(확장)</td><td>OBJ / FBX / Collada — three example loaders</td><td>지연 <code>import()</code> → 별도 Vite 청크(초기 번들 미증가)</td></tr>
+  <tr><td>로더(IFC)</td><td>web-ifc <code>IfcAPI</code> (v0.0.77)</td><td>단일스레드 <code>web-ifc.wasm</code> 자가호스팅(<code>/web-ifc/</code>), <code>SetWasmPath(...,true)</code></td></tr>
+  <tr><td>적응형 품질</td><td>FPS 측정 + pixelRatio 사다리</td><td>외부 의존성 0 — <code>ui/fps.ts</code> + <code>viewer/adaptiveQuality.ts</code></td></tr>
+  <tr><td>지오메트리 압축</td><td>Draco</td><td>~73% 축소 검증됨</td></tr>
+  <tr><td>텍스처 압축</td><td>WebP(런타임) / KTX2·Basis(고급)</td><td>KTX2는 별도 CLI 단계(<code>toktx</code>)</td></tr>
+  <tr><td>빌드</td><td>Vite + TypeScript (strict)</td><td>three vendor + 포맷별 로더 청크 분리</td></tr>
+  <tr><td>디코더 호스팅</td><td>Vite hashed Draco·Basis asset + <code>public/web-ifc</code></td><td>Three.js import로 생성, single-thread IFC WASM만 postinstall 복사</td></tr>
+  <tr><td>에셋 파이프라인</td><td>gltf-transform + draco3d</td><td><code>tools/preprocess.mjs</code> (GLB 전용)</td></tr>
+</table>
+
+<h2>4. 런타임 파일 구조</h2>
+<pre>src/
+  main.ts                 # 진입점 — ThreeDViewer + Dropzone 와이어링, ?model= Path A
+  viewer/
+    loaders.ts            # getLoaders() 싱글톤 (GLTF+DRACO+KTX2)
+    modelLoader.ts        # ★ loadModel() 포맷 디스패치 (glb/gltf/obj/fbx/dae/ifc) → Object3D
+    ThreeDViewer.ts       # 핵심 클래스: 렌더러/씬/카메라/OrbitControls/로드/dispose + FPS·적응형 와이어링
+    adaptiveQuality.ts    # ★ pixelRatio 사다리 + 히스테리시스 (60fps↓ 강등)
+    hydration.ts          # createHydrationGate() — 양쪽 마크 시 페이드
+  dnd/dropzone.ts         # HTML5 DnD + 클릭탐색 + extOf 검증 → loadLocalFile
+  ui/
+    progress.ts           # showProgress/hideProgress/setProgress/setStatus
+    fps.ts                # ★ 화면 FPS 오버레이 (EMA, 색상코딩)
+public/
+  web-ifc/                # ★ web-ifc.wasm (단일스레드, 자동 복사)
+  samples/                # 배포 demo: Box/Duck/Avocado/Duck.optimized + Cube.obj/dae/fbx/ifc
+  previews/               # Duck.webp + Cube.{obj,dae,fbx,ifc}.webp (24프레임 360°)
+dist/assets/              # ★ Vite hashed Draco/Basis decoder JS/WASM
+tools/
+  preprocess.mjs          # gltf-transform Draco+WebP 압축 (GLB 전용)
+  copy-decoders.mjs       # postinstall: single-thread web-ifc WASM 복사
+  prerender.mjs           # 360° 턴테이블 → Animated WebP (포맷 무관)
+  perf-smoke.mjs          # 헤드리스 체감 로드 측정 (&lt;3s)
+  adaptive-smoke.mjs      # ★ CPU 스로틀로 60fps↓ 강등 실증
+</pre>
+
+<h2>5. 멀티에이전트 + 다이나믹 워크플로우</h2>
+<p>에이전트가 <code>PLAN.md</code> + <code>PROGRESS.md</code>를 매 시작 시 읽어 다음 작업을 결정. 병렬 안전(파일 스코프 분리).</p>
+<p class="card"><strong>Phase 6/7은 다이나믹 Workflow <code>multiformat-viewer</code>로 구현</strong> (7 에이전트, 296k 토큰): Research(3 병렬·읽기전용: web-ifc API / 적응형 성능 / three 로더 형태) <span class="arrow">→</span> Core(viewer-core) <span class="arrow">→</span> Enhance(FPS ‖ 에셋) <span class="arrow">→</span> Verify(빌드 green). git 미사용 환경이라 worktree 격리 대신 병렬 웨이브별 파일 스코프 분리로 충돌 방지.</p>
+<div class="grid">
+  <div>
+    <h3>에이전트</h3>
+    <table>
+      <tr><th>이름</th><th>역할</th></tr>
+      <tr><td>task-lead</td><td>PLAN/PROGRESS 읽고 다음 작업 분배</td></tr>
+      <tr><td>viewer-core</td><td>src/viewer/* 씬·로더·하이드레이션·FPS</td></tr>
+      <tr><td>dnd-handler</td><td>src/dnd/* 드래그드롭·검증</td></tr>
+      <tr><td>asset-pipeline</td><td>tools/* 압축·프리렌더·샘플</td></tr>
+      <tr><td>hydration</td><td>SSR 자리표시자→캔버스 페이드</td></tr>
+      <tr><td>reviewer</td><td>누수/에러/성능 감사(읽기 위주)</td></tr>
+    </table>
+  </div>
+  <div>
+    <h3>명령 / 스킬 / 훅</h3>
+    <p><strong>명령:</strong> <code>/bootstrap</code> <code>/next-task</code> <code>/report</code> <code>/optimize-asset</code> <code>/verify-viewer</code></p>
+    <p><strong>스킬:</strong> <code>threejs-viewer</code>(로드 패턴), <code>task-graph</code>(조정 프로토콜)</p>
+    <p><strong>훅:</strong> <code>session-start.sh</code>(PLAN/PROGRESS 읽기 알림), <code>progress-nudge.sh</code>(src 편집 시 알림)</p>
+    <p class="meta">CLAUDE.md가 두 파일 선독을 강제 + 에이전트/스킬/명령 매핑표 + 세션 런북 포함.</p>
+  </div>
+</div>
+
+<h2>6. 계획 진행 상태 (PLAN.md)</h2>
+<table>
+  <tr><th>Phase</th><th>범위</th><th>상태</th></tr>
+  <tr><td>P0 Bootstrap</td><td>Vite/TS 셋업, 디코더, 기본 씬</td><td><span class="badge ok">done · 빌드 검증</span></td></tr>
+  <tr><td>P1 Core 뷰어</td><td>싱글톤 로더, loadServer/Local, OrbitControls, 프레이밍</td><td><span class="badge ok">done · 빌드 검증</span></td></tr>
+  <tr><td>P2 Drag &amp; Drop</td><td>드롭존 UI, 검증, loadLocalFile 와이어링</td><td><span class="badge ok">done · 빌드 검증</span></td></tr>
+  <tr><td>P3 Hydration</td><td>WebP 자리표시자, 게이트, UI 토글</td><td><span class="badge ok">done</span></td></tr>
+  <tr><td>P4 에셋 파이프라인</td><td>preprocess.mjs, 샘플셋, 프리렌더</td><td><span class="badge ok">P4-1/2/3 done</span></td></tr>
+  <tr><td>P5 Hardening</td><td>누수/에러 감사, 퍼포먼스, 리뷰</td><td><span class="badge ok">P5-1/2/3/4 done</span> 0 critical</td></tr>
+  <tr><td>P6 멀티포맷 로더</td><td>OBJ/FBX/DAE/IFC, SSR+CSR, modelLoader 디스패치, 샘플+프리뷰</td><td><span class="badge ok">P6-1..5 done</span> 6포맷 검증</td></tr>
+  <tr><td>P7 FPS + 적응형 품질</td><td>화면 FPS, pixelRatio 사다리, animate 와이어링</td><td><span class="badge ok">P7-1/2/3 done</span> 강등 실증</td></tr>
+</table>
+
+<h2>7. FPS 표시 + 적응형 품질 (&lt;60fps → 최적화)</h2>
+<div class="card">
+  <ul>
+    <li><strong>FPS 오버레이</strong> (<code>ui/fps.ts</code>): 좌상단, 프레임 델타 EMA 평활, ~250ms 스로틀 DOM 갱신. 색상 — <span class="yes">≥60 녹색</span> / 30–59 주황 / <span class="no">&lt;30 빨강</span>.</li>
+    <li><strong>적응형 사다리</strong> (<code>viewer/adaptiveQuality.ts</code>): pixelRatio 5단계 <code>[min(DPR,2) · 1.5 · 1 · 0.75 · 0.5]</code>. 가장 고효율·저위험 런타임 노브(드로잉 버퍼 재할당, CSS 리플로우 없음).</li>
+    <li><strong>히스테리시스</strong>(진동 방지): 평균 &lt;60fps가 <strong>60프레임 지속</strong> 시 1단계 강등 / 평균 &gt;72fps가 <strong>180프레임 지속</strong> 시 1단계 복귀 / 60–72 데드밴드는 카운터 리셋.</li>
+    <li><strong>실증</strong>(<code>tools/adaptive-smoke.mjs</code>): 헤드리스 swiftshader + CDP CPU 스로틀 6×로 ABeautifulGame(11.5MB) 로드 → 실측 FPS <strong>19→4</strong>, 적응형 <strong>tier 0→1→2→3</strong> (pr 1.5→1→0.75) 로그 캡처. 로직 미패치, 실제 프레임 측정으로 발화.</li>
+  </ul>
+  <p class="meta">참고: CPU 스로틀 하에선 병목이 JS/지오메트리(필레이트 아님)라 pixelRatio 강등의 FPS 회복폭이 작음(4→7) — 메커니즘은 정상 발화하나, 이 노브는 GPU 필레이트 병목 씬에서 효과가 큼.</p>
+</div>
+
+<h2>8. 현재 구현 상태</h2>
+<div class="card">
+  <ul>
+    <li><strong>빌드:</strong> <code>tsc --noEmit</code> 클린, Vite 8 production build 통과. 3D artifact 27개, 8,149,402 bytes, 50KB 이상 중복 0개.</li>
+    <li><strong>포맷별 인브라우저 로드(헤드리스 Chrome):</strong> GLB 229ms · OBJ 173ms · FBX 158ms · DAE 178ms · <strong>IFC 463ms</strong> · Duck.optimized 182ms — 전체 &lt;3000ms PASS.</li>
+    <li><strong>적응형 품질:</strong> 60fps 미만 지속 시 pixelRatio 3단계 강등 실측 확인(위 7절).</li>
+    <li><strong>샘플:</strong> Box/Duck/Avocado/Duck.optimized(GLB) + Cube.obj(793B)/Cube.dae(2.1K)/Cube.fbx(16.2K)/Cube.ifc(2.3K). 각 24프레임 360° WebP 프리뷰.</li>
+    <li><strong>KTX2 런타임 경로:</strong> official Three.js ETC1S KTX2 fixture를 production subpath에서 로드하고 hashed Basis transcoder WASM request와 model ready를 E2E로 확인. 인코딩은 toktx 필요(미설치).</li>
+    <li><strong>하드닝:</strong> WebGL 미지원 가드, 로드 실패 메시지(<code>#status</code>), DnD 검증 피드백, IFC wasm 메모리 해제 — reviewer 0 critical.</li>
+  </ul>
+</div>
+
+<h2>9. 실행 명령</h2>
+<pre># 개발 서버 (HMR)
+npm run dev            # → http://127.0.0.1:3333
+
+# 프로덕션 빌드 + 미리보기
+npm run build         # tsc --noEmit && vite build → dist/
+npm run preview       # → http://127.0.0.1:4173
+
+# 사용
+#  CSR(Path B): .glb .gltf .obj .fbx .dae .ifc 를 드롭존에 드롭 / 클릭 선택
+#  SSR(Path A): http://127.0.0.1:4173/?model=/samples/Cube.ifc
+
+# 검증/도구 (Git-Bash는 MSYS_NO_PATHCONV=1 접두 필요)
+node tools/perf-smoke.mjs                                   # 포맷별 체감 로드 <3s
+node tools/adaptive-smoke.mjs --throttle 6 --seconds 30    # 60fps↓ 강등 실증
+node tools/preprocess.mjs &lt;file.glb&gt;                        # Draco+WebP 압축(GLB)
+node tools/prerender.mjs                                    # 360° WebP 프리뷰 생성
+</pre>
+
+<h2>10. 다음 단계 (선택)</h2>
+<ul>
+  <li>✅ 전체 PLAN 완료 (P0–P7). 6포맷 로드 · SSR+CSR · 화면 FPS · 적응형 품질 전부 인브라우저 실증.</li>
+  <li>OBJ/DAE 외부 텍스처: 다중 파일 드롭(.obj+.mtl+이미지) 또는 zip 수용 — 현재는 <code>blob:</code> 제약으로 지오메트리 전용.</li>
+  <li>FBX/Collada 애니메이션: <code>AnimationMixer</code> 재생(현재 정적). <code>document.hidden</code> 배경탭 FPS 가드.</li>
+  <li>KTX2 인코딩 파이프라인: KTX-Software(toktx) 설치 후 <code>gltf-transform etc1s|uastc</code>.</li>
+  <li>실서버 SSR 연결 + 실기기 체감 로드 측정(현재 수치는 헤드리스).</li>
+</ul>
+
+<hr class="sep" />
+<p class="meta">작업 로그: <code>PROGRESS.md</code> · 작업 그래프: <code>PLAN.md</code> · 지침: <code>CLAUDE.md</code></p>
+
+</body>
+</html>

apps/viewer-3d/index.html

@@ -0,0 +1,30 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <link rel="icon" href="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg'/%3E" />
+    <title>hmwebviewer — 3D Viewer</title>
+    <link rel="stylesheet" href="/src/style.css" />
+  </head>
+  <body>
+    <div id="app">
+      <!-- SSR placeholder: pre-rendered 360 WebP fades out on hydration -->
+      <img id="preview" class="preview hidden" alt="3D preview placeholder" />
+      <div id="viewer" class="viewer"></div>
+      <div id="controls" class="controls">
+        <button id="btn-fit" type="button">Zoom Fit</button>
+        <button id="btn-persp" type="button" class="active">원근뷰</button>
+        <button id="btn-ortho" type="button">직교뷰</button>
+        <button id="btn-outline" type="button">테두리</button>
+      </div>
+      <div id="progress" class="progress hidden"><div class="bar"></div></div>
+      <div id="dropzone" class="dropzone">
+        <p>Drop a <strong>.glb .gltf .obj .fbx .dae .ifc .ply</strong> (+ .mtl) here, or click to browse</p>
+        <p id="status" class="status"></p>
+        <input id="file-input" type="file" accept=".glb,.gltf,.obj,.fbx,.dae,.ifc,.ply,.mtl" multiple hidden />
+      </div>
+    </div>
+    <script type="module" src="/src/main.ts"></script>
+  </body>
+</html>

apps/viewer-3d/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "@hmwebviewer/viewer-3d",
+  "private": true,
+  "version": "0.1.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc --noEmit && vite build",
+    "build:subpath:e2e": "vite build --base=/viewer-3d/ --outDir=dist-subpath",
+    "preview": "vite preview",
+    "preview:subpath:e2e": "vite preview --base=/viewer-3d/ --outDir=dist-subpath --host 127.0.0.1 --port 43174 --strictPort",
+    "serve:subpath:e2e": "npm run build:subpath:e2e && npm run preview:subpath:e2e",
+    "typecheck": "tsc --noEmit",
+    "stage:decoders": "node tools/copy-decoders.mjs"
+  },
+  "dependencies": {
+    "three": "0.185.1",
+    "web-ifc": "0.0.77"
+  },
+  "devDependencies": {
+    "puppeteer-core": "^25.1.0"
+  }
+}

apps/viewer-3d/public/samples/Cube.dae

@@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Cube.dae - hand-authored minimal COLLADA 1.4.1 unit cube for hmwebviewer ColladaLoader testing.
+     Single <geometry> (8 verts, 12 triangles) in one <visual_scene>. Edge length 2 (range -1..1),
+     centered at origin. Works for Path A (SSR ?model=) and Path B (drag & drop). No network required. -->
+<COLLADA xmlns="http://www.collada.org/2005/11/COLLADASchema" version="1.4.1">
+  <asset>
+    <contributor>
+      <author>hmwebviewer</author>
+      <authoring_tool>hand-authored</authoring_tool>
+    </contributor>
+    <created>2026-06-19T00:00:00Z</created>
+    <modified>2026-06-19T00:00:00Z</modified>
+    <unit name="meter" meter="1"/>
+    <up_axis>Y_UP</up_axis>
+  </asset>
+
+  <library_geometries>
+    <geometry id="Cube-mesh" name="Cube">
+      <mesh>
+        <source id="Cube-positions">
+          <float_array id="Cube-positions-array" count="24">
+            -1 -1 -1  -1 -1 1  -1 1 -1  -1 1 1  1 -1 -1  1 -1 1  1 1 -1  1 1 1
+          </float_array>
+          <technique_common>
+            <accessor source="#Cube-positions-array" count="8" stride="3">
+              <param name="X" type="float"/>
+              <param name="Y" type="float"/>
+              <param name="Z" type="float"/>
+            </accessor>
+          </technique_common>
+        </source>
+        <vertices id="Cube-vertices">
+          <input semantic="POSITION" source="#Cube-positions"/>
+        </vertices>
+        <triangles count="12">
+          <input semantic="VERTEX" source="#Cube-vertices" offset="0"/>
+          <p>
+            0 1 3  0 3 2
+            4 6 7  4 7 5
+            0 4 5  0 5 1
+            2 3 7  2 7 6
+            0 2 6  0 6 4
+            1 5 7  1 7 3
+          </p>
+        </triangles>
+      </mesh>
+    </geometry>
+  </library_geometries>
+
+  <library_visual_scenes>
+    <visual_scene id="Scene" name="Scene">
+      <node id="Cube" name="Cube" type="NODE">
+        <matrix sid="transform">1 0 0 0  0 1 0 0  0 0 1 0  0 0 0 1</matrix>
+        <instance_geometry url="#Cube-mesh" name="Cube"/>
+      </node>
+    </visual_scene>
+  </library_visual_scenes>
+
+  <scene>
+    <instance_visual_scene url="#Scene"/>
+  </scene>
+</COLLADA>

apps/viewer-3d/public/samples/Cube.ifc

@@ -0,0 +1,59 @@
+ISO-10303-21;
+HEADER;
+/* hand-authored minimal IFC4 file for hmwebviewer web-ifc testing.
+   One IfcWall (1m x 1m footprint, 1m high) as a swept-extruded solid placed in a
+   site/building/storey spatial tree. Validates with web-ifc; loadable via Path A
+   (SSR ?model=) and Path B (drag & drop). No network required. */
+FILE_DESCRIPTION(('ViewDefinition [ReferenceView_V1.2]'),'2;1');
+FILE_NAME('Cube.ifc','2026-06-19T00:00:00',(''),(''),'hmwebviewer','hand-authored','');
+FILE_SCHEMA(('IFC4'));
+ENDSEC;
+DATA;
+#1=IFCPERSON($,$,'',$,$,$,$,$);
+#2=IFCORGANIZATION($,'hmwebviewer',$,$,$);
+#3=IFCPERSONANDORGANIZATION(#1,#2,$);
+#4=IFCAPPLICATION(#2,'1.0','hmwebviewer','hmw');
+#5=IFCOWNERHISTORY(#3,#4,$,.ADDED.,$,$,$,0);
+
+#6=IFCDIRECTION((1.,0.,0.));
+#7=IFCDIRECTION((0.,0.,1.));
+#8=IFCCARTESIANPOINT((0.,0.,0.));
+#9=IFCAXIS2PLACEMENT3D(#8,#7,#6);
+#10=IFCGEOMETRICREPRESENTATIONCONTEXT($,'Model',3,1.E-05,#9,$);
+
+#11=IFCSIUNIT(*,.LENGTHUNIT.,$,.METRE.);
+#12=IFCSIUNIT(*,.AREAUNIT.,$,.SQUARE_METRE.);
+#13=IFCSIUNIT(*,.VOLUMEUNIT.,$,.CUBIC_METRE.);
+#14=IFCUNITASSIGNMENT((#11,#12,#13));
+
+#15=IFCPROJECT('0Project00000000000000000',#5,'Project',$,$,$,$,(#10),#14);
+
+#20=IFCLOCALPLACEMENT($,#9);
+#21=IFCSITE('0Site0000000000000000000',#5,'Site',$,$,#20,$,$,.ELEMENT.,$,$,$,$,$);
+#22=IFCLOCALPLACEMENT(#20,#9);
+#23=IFCBUILDING('0Building000000000000000',#5,'Building',$,$,#22,$,$,.ELEMENT.,$,$,$);
+#24=IFCLOCALPLACEMENT(#22,#9);
+#25=IFCBUILDINGSTOREY('0Storey00000000000000000',#5,'Storey',$,$,#24,$,$,.ELEMENT.,0.);
+
+#30=IFCRELAGGREGATES('0RelAggProject0000000000',#5,$,$,#15,(#21));
+#31=IFCRELAGGREGATES('0RelAggSite000000000000 ',#5,$,$,#21,(#23));
+#32=IFCRELAGGREGATES('0RelAggBuilding00000000 ',#5,$,$,#23,(#25));
+
+/* --- Wall geometry: 1m x 1m rectangle extruded 1m up --- */
+#40=IFCCARTESIANPOINT((-0.5,-0.5));
+#41=IFCCARTESIANPOINT((0.5,-0.5));
+#42=IFCCARTESIANPOINT((0.5,0.5));
+#43=IFCCARTESIANPOINT((-0.5,0.5));
+#44=IFCPOLYLINE((#40,#41,#42,#43,#40));
+#45=IFCARBITRARYCLOSEDPROFILEDEF(.AREA.,$,#44);
+#46=IFCAXIS2PLACEMENT3D(#8,#7,#6);
+#47=IFCEXTRUDEDAREASOLID(#45,#46,#7,1.);
+#48=IFCSHAPEREPRESENTATION(#10,'Body','SweptSolid',(#47));
+#49=IFCPRODUCTDEFINITIONSHAPE($,$,(#48));
+
+#50=IFCLOCALPLACEMENT(#24,#9);
+#51=IFCWALL('0Wall00000000000000000000',#5,'Wall',$,$,#50,#49,$,.SOLIDWALL.);
+
+#60=IFCRELCONTAINEDINSPATIALSTRUCTURE('0RelContained0000000000 ',#5,$,$,(#51),#25);
+ENDSEC;
+END-ISO-10303-21;

apps/viewer-3d/public/samples/Cube.obj

@@ -0,0 +1,16 @@
+# Hand-authored cube fixture
+o Cube
+v -1 -1 -1
+v 1 -1 -1
+v 1 1 -1
+v -1 1 -1
+v -1 -1 1
+v 1 -1 1
+v 1 1 1
+v -1 1 1
+f 1 4 3 2
+f 5 6 7 8
+f 1 2 6 5
+f 2 3 7 6
+f 3 4 8 7
+f 4 1 5 8

apps/viewer-3d/public/samples/DoublePrecision.ply

@@ -0,0 +1,17 @@
+ply
+format ascii 1.0
+comment Three.js r185 Float64 normalization fixture
+element vertex 3
+property double x
+property double y
+property double z
+property uchar red
+property uchar green
+property uchar blue
+element face 1
+property list uchar int vertex_indices
+end_header
+0.0 0.0 0.0 255 0 0
+100.0 0.0 0.0 0 255 0
+0.0 100.0 0.0 0 0 255
+3 0 1 2

apps/viewer-3d/samples/Cube.dae

@@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Cube.dae - hand-authored minimal COLLADA 1.4.1 unit cube for hmwebviewer ColladaLoader testing.
+     Single <geometry> (8 verts, 12 triangles) in one <visual_scene>. Edge length 2 (range -1..1),
+     centered at origin. Works for Path A (SSR ?model=) and Path B (drag & drop). No network required. -->
+<COLLADA xmlns="http://www.collada.org/2005/11/COLLADASchema" version="1.4.1">
+  <asset>
+    <contributor>
+      <author>hmwebviewer</author>
+      <authoring_tool>hand-authored</authoring_tool>
+    </contributor>
+    <created>2026-06-19T00:00:00Z</created>
+    <modified>2026-06-19T00:00:00Z</modified>
+    <unit name="meter" meter="1"/>
+    <up_axis>Y_UP</up_axis>
+  </asset>
+
+  <library_geometries>
+    <geometry id="Cube-mesh" name="Cube">
+      <mesh>
+        <source id="Cube-positions">
+          <float_array id="Cube-positions-array" count="24">
+            -1 -1 -1  -1 -1 1  -1 1 -1  -1 1 1  1 -1 -1  1 -1 1  1 1 -1  1 1 1
+          </float_array>
+          <technique_common>
+            <accessor source="#Cube-positions-array" count="8" stride="3">
+              <param name="X" type="float"/>
+              <param name="Y" type="float"/>
+              <param name="Z" type="float"/>
+            </accessor>
+          </technique_common>
+        </source>
+        <vertices id="Cube-vertices">
+          <input semantic="POSITION" source="#Cube-positions"/>
+        </vertices>
+        <triangles count="12">
+          <input semantic="VERTEX" source="#Cube-vertices" offset="0"/>
+          <p>
+            0 1 3  0 3 2
+            4 6 7  4 7 5
+            0 4 5  0 5 1
+            2 3 7  2 7 6
+            0 2 6  0 6 4
+            1 5 7  1 7 3
+          </p>
+        </triangles>
+      </mesh>
+    </geometry>
+  </library_geometries>
+
+  <library_visual_scenes>
+    <visual_scene id="Scene" name="Scene">
+      <node id="Cube" name="Cube" type="NODE">
+        <matrix sid="transform">1 0 0 0  0 1 0 0  0 0 1 0  0 0 0 1</matrix>
+        <instance_geometry url="#Cube-mesh" name="Cube"/>
+      </node>
+    </visual_scene>
+  </library_visual_scenes>
+
+  <scene>
+    <instance_visual_scene url="#Scene"/>
+  </scene>
+</COLLADA>

apps/viewer-3d/samples/Cube.ifc

@@ -0,0 +1,59 @@
+ISO-10303-21;
+HEADER;
+/* hand-authored minimal IFC4 file for hmwebviewer web-ifc testing.
+   One IfcWall (1m x 1m footprint, 1m high) as a swept-extruded solid placed in a
+   site/building/storey spatial tree. Validates with web-ifc; loadable via Path A
+   (SSR ?model=) and Path B (drag & drop). No network required. */
+FILE_DESCRIPTION(('ViewDefinition [ReferenceView_V1.2]'),'2;1');
+FILE_NAME('Cube.ifc','2026-06-19T00:00:00',(''),(''),'hmwebviewer','hand-authored','');
+FILE_SCHEMA(('IFC4'));
+ENDSEC;
+DATA;
+#1=IFCPERSON($,$,'',$,$,$,$,$);
+#2=IFCORGANIZATION($,'hmwebviewer',$,$,$);
+#3=IFCPERSONANDORGANIZATION(#1,#2,$);
+#4=IFCAPPLICATION(#2,'1.0','hmwebviewer','hmw');
+#5=IFCOWNERHISTORY(#3,#4,$,.ADDED.,$,$,$,0);
+
+#6=IFCDIRECTION((1.,0.,0.));
+#7=IFCDIRECTION((0.,0.,1.));
+#8=IFCCARTESIANPOINT((0.,0.,0.));
+#9=IFCAXIS2PLACEMENT3D(#8,#7,#6);
+#10=IFCGEOMETRICREPRESENTATIONCONTEXT($,'Model',3,1.E-05,#9,$);
+
+#11=IFCSIUNIT(*,.LENGTHUNIT.,$,.METRE.);
+#12=IFCSIUNIT(*,.AREAUNIT.,$,.SQUARE_METRE.);
+#13=IFCSIUNIT(*,.VOLUMEUNIT.,$,.CUBIC_METRE.);
+#14=IFCUNITASSIGNMENT((#11,#12,#13));
+
+#15=IFCPROJECT('0Project00000000000000000',#5,'Project',$,$,$,$,(#10),#14);
+
+#20=IFCLOCALPLACEMENT($,#9);
+#21=IFCSITE('0Site0000000000000000000',#5,'Site',$,$,#20,$,$,.ELEMENT.,$,$,$,$,$);
+#22=IFCLOCALPLACEMENT(#20,#9);
+#23=IFCBUILDING('0Building000000000000000',#5,'Building',$,$,#22,$,$,.ELEMENT.,$,$,$);
+#24=IFCLOCALPLACEMENT(#22,#9);
+#25=IFCBUILDINGSTOREY('0Storey00000000000000000',#5,'Storey',$,$,#24,$,$,.ELEMENT.,0.);
+
+#30=IFCRELAGGREGATES('0RelAggProject0000000000',#5,$,$,#15,(#21));
+#31=IFCRELAGGREGATES('0RelAggSite000000000000 ',#5,$,$,#21,(#23));
+#32=IFCRELAGGREGATES('0RelAggBuilding00000000 ',#5,$,$,#23,(#25));
+
+/* --- Wall geometry: 1m x 1m rectangle extruded 1m up --- */
+#40=IFCCARTESIANPOINT((-0.5,-0.5));
+#41=IFCCARTESIANPOINT((0.5,-0.5));
+#42=IFCCARTESIANPOINT((0.5,0.5));
+#43=IFCCARTESIANPOINT((-0.5,0.5));
+#44=IFCPOLYLINE((#40,#41,#42,#43,#40));
+#45=IFCARBITRARYCLOSEDPROFILEDEF(.AREA.,$,#44);
+#46=IFCAXIS2PLACEMENT3D(#8,#7,#6);
+#47=IFCEXTRUDEDAREASOLID(#45,#46,#7,1.);
+#48=IFCSHAPEREPRESENTATION(#10,'Body','SweptSolid',(#47));
+#49=IFCPRODUCTDEFINITIONSHAPE($,$,(#48));
+
+#50=IFCLOCALPLACEMENT(#24,#9);
+#51=IFCWALL('0Wall00000000000000000000',#5,'Wall',$,$,#50,#49,$,.SOLIDWALL.);
+
+#60=IFCRELCONTAINEDINSPATIALSTRUCTURE('0RelContained0000000000 ',#5,$,$,(#51),#25);
+ENDSEC;
+END-ISO-10303-21;

apps/viewer-3d/src/dnd/dropzone.ts

@@ -0,0 +1,84 @@
+/**
+ * Drag & drop local-file path (PLAN P2-1, P2-2).
+ *
+ * Captures HTML5 DnD events + click-to-browse on the #dropzone element,
+ * validates the picked file is a supported model, and forwards valid files to
+ * viewer-core's loadLocalFile. createObjectURL/revoke lifecycle is owned by
+ * the viewer (per the locked Blob URL pattern in SKILL.md); this module only
+ * validates + hands the File off.
+ */
+
+import { extOf } from '../viewer/modelLoader';
+
+/** Viewer surface this module depends on (viewer-core implements loadLocalFile). */
+export interface ViewerHandle {
+  loadLocalFile: (file: File, sidecars?: File[]) => void;
+}
+
+/** Options for initDropzone. */
+export interface DropzoneOpts {
+  viewer: ViewerHandle;
+  dropzone: HTMLElement;
+  fileInput: HTMLInputElement;
+  /** Optional error sink; defaults to console.warn. */
+  onError?: (msg: string) => void;
+}
+
+/** Accept any supported model extension by name (case-insensitive). */
+function isValidModel(file: File): boolean {
+  return extOf(file.name) !== null;
+}
+
+/**
+ * Wire up drag/drop + click-to-browse on the given dropzone.
+ * Idempotent-ish: attaches listeners; caller should call once per element.
+ */
+export function initDropzone(opts: DropzoneOpts): void {
+  const { dropzone, fileInput, viewer } = opts;
+  const onError = opts.onError ?? ((msg: string) => console.warn(msg));
+
+  // Accept multiple files at once: the first supported model is the primary,
+  // the rest (e.g. a .mtl beside an .obj) ride along as sidecars.
+  const handleFiles = (files: File[]): void => {
+    if (!files.length) return;
+    const model = files.find(isValidModel);
+    if (!model) {
+      onError("Unsupported file (use .glb .gltf .obj .fbx .dae .ifc)");
+      return;
+    }
+    viewer.loadLocalFile(model, files.filter((f) => f !== model));
+  };
+
+  // --- Drag & drop ---
+  // preventDefault on dragover is MANDATORY or the browser navigates to the file.
+  dropzone.addEventListener("dragover", (e: DragEvent) => {
+    e.preventDefault();
+    dropzone.classList.add("drag");
+  });
+
+  dropzone.addEventListener("dragenter", (e: DragEvent) => {
+    e.preventDefault();
+    dropzone.classList.add("drag");
+  });
+
+  dropzone.addEventListener("dragleave", () => {
+    dropzone.classList.remove("drag");
+  });
+
+  dropzone.addEventListener("drop", (e: DragEvent) => {
+    e.preventDefault();
+    dropzone.classList.remove("drag");
+    handleFiles(Array.from(e.dataTransfer?.files ?? []));
+  });
+
+  // --- Click to browse (accessibility) ---
+  dropzone.addEventListener("click", () => {
+    fileInput.click();
+  });
+
+  fileInput.addEventListener("change", () => {
+    handleFiles(Array.from(fileInput.files ?? []));
+    // reset so picking the same file twice fires `change` again
+    fileInput.value = "";
+  });
+}

apps/viewer-3d/src/main.ts

@@ -0,0 +1,83 @@
+import { ThreeDViewer } from './viewer/ThreeDViewer';
+import { initDropzone } from './dnd/dropzone';
+import { setStatus } from './ui/progress';
+import { publicAssetUrl } from './runtimeBase';
+
+/**
+ * Entry point. Wires the ThreeDViewer (renderer + loaders + hydration) and the
+ * Drag & Drop local-file path. Path A (server asset) is also available via the
+ * `?model=<url>` query param so the SSR+CSR+hydration flow can be exercised
+ * without extra UI.
+ */
+const viewerEl = document.getElementById('viewer');
+const progressEl = document.getElementById('progress');
+const previewEl = document.getElementById('preview') as HTMLImageElement | null;
+const dropzoneEl = document.getElementById('dropzone');
+const fileInputEl = document.getElementById('file-input') as HTMLInputElement | null;
+const statusEl = document.getElementById('status');
+
+if (!viewerEl || !progressEl || !previewEl || !dropzoneEl || !fileInputEl || !statusEl) {
+  throw new Error('hmwebviewer: required DOM elements missing');
+}
+
+const onError = (msg: string) => setStatus(statusEl, msg);
+
+let viewer: ThreeDViewer;
+try {
+  viewer = new ThreeDViewer(viewerEl, progressEl, previewEl, onError);
+} catch (err) {
+  console.error('[hmwebviewer] init failed', err);
+  setStatus(statusEl, 'WebGL is required but unavailable in this browser.');
+  throw err;
+}
+
+initDropzone({
+  viewer,
+  dropzone: dropzoneEl,
+  fileInput: fileInputEl,
+  onError: (msg) => { console.warn('[hmwebviewer]', msg); setStatus(statusEl, msg); },
+});
+
+// Viewer controls — Zoom Fit, projection toggle, outline overlay
+document.getElementById('btn-fit')?.addEventListener('click', () => viewer.fitView());
+
+const perspBtn = document.getElementById('btn-persp');
+const orthoBtn = document.getElementById('btn-ortho');
+const setProjection = (mode: 'persp' | 'ortho') => {
+  viewer.setProjection(mode);
+  perspBtn?.classList.toggle('active', mode === 'persp');
+  orthoBtn?.classList.toggle('active', mode === 'ortho');
+};
+perspBtn?.addEventListener('click', () => setProjection('persp'));
+orthoBtn?.addEventListener('click', () => setProjection('ortho'));
+
+const outlineBtn = document.getElementById('btn-outline');
+outlineBtn?.addEventListener('click', () => {
+  const on = viewer.toggleOutline();
+  outlineBtn.classList.toggle('active', on);
+});
+
+// Path A (server asset) — opt-in via ?model=<url>
+const modelUrl = new URLSearchParams(window.location.search).get('model');
+if (modelUrl) {
+  // SSR placeholder: a pre-rendered 360° animated WebP (tools/prerender.mjs)
+  // shows instantly, then the hydration gate fades it out once WebGL + model ready.
+  const base = modelUrl.split('/').pop()!.replace(/\.(glb|gltf|obj|fbx|dae|ifc|ply)$/i, '');
+  previewEl.src = publicAssetUrl(`previews/${base}.webp`);
+  previewEl.classList.remove('hidden');
+  previewEl.onerror = () => previewEl.classList.add('hidden');
+  viewer.loadServerAsset(modelUrl);
+}
+
+// tools/prerender.mjs가 회전 frame을 캡처할 때 사용하는 공개 reference입니다.
+const viewerWindow = window as Window & { __viewer?: ThreeDViewer };
+viewerWindow.__viewer = viewer;
+
+window.addEventListener(
+  'pagehide',
+  () => {
+    viewer.dispose();
+    delete viewerWindow.__viewer;
+  },
+  { once: true },
+);

apps/viewer-3d/src/runtimeBase.ts

@@ -0,0 +1,12 @@
+/**
+ * Vite의 배포 base 아래에 있는 public asset의 절대 URL을 반환합니다.
+ */
+export function publicAssetUrl(
+  path: string,
+  base = import.meta.env.BASE_URL,
+  origin = window.location.origin,
+): string {
+  const normalizedBase = base.endsWith('/') ? base : `${base}/`;
+  const normalizedPath = path.replace(/^\/+/, '');
+  return new URL(normalizedPath, new URL(normalizedBase, `${origin}/`)).href;
+}

apps/viewer-3d/src/style.css

@@ -0,0 +1,51 @@
+:root {
+  color-scheme: dark;
+  font-family: system-ui, sans-serif;
+}
+* { box-sizing: border-box; }
+html, body, #app { margin: 0; height: 100%; }
+#app { position: relative; background: #111; color: #eee; overflow: hidden; }
+
+.viewer { position: absolute; inset: 0; }
+.viewer canvas { display: block; width: 100%; height: 100%; }
+
+.preview {
+  position: absolute; inset: 0; width: 100%; height: 100%;
+  object-fit: contain; background: #111; z-index: 2;
+  transition: opacity 0.5s ease;
+}
+.hidden { display: none !important; }
+
+.progress {
+  position: absolute; left: 0; right: 0; bottom: 0; height: 4px; z-index: 3;
+  background: rgba(255,255,255,0.1);
+}
+.progress .bar { height: 100%; width: 0%; background: #4aa3ff; transition: width 0.1s linear; }
+
+.fps {
+  position: absolute; top: 8px; left: 8px; z-index: 4;
+  font: 12px/1.4 ui-monospace, monospace; padding: 2px 6px;
+  background: rgba(0,0,0,0.5); border-radius: 4px; pointer-events: none;
+}
+
+.controls {
+  position: absolute; top: 8px; right: 8px; z-index: 4;
+  display: flex; gap: 6px;
+}
+.controls button {
+  font: 12px/1.4 system-ui, sans-serif; padding: 6px 10px;
+  background: rgba(0,0,0,0.55); color: #eee; border: 1px solid #888;
+  border-radius: 6px; cursor: pointer;
+}
+.controls button:hover { background: rgba(0,0,0,0.75); border-color: #4aa3ff; }
+.controls button.active { background: #4aa3ff; color: #00264d; border-color: #4aa3ff; }
+
+.dropzone {
+  position: absolute; left: 50%; bottom: 24px; transform: translateX(-50%);
+  padding: 10px 18px; border: 1px dashed #555; border-radius: 10px;
+  background: rgba(0,0,0,0.4); font-size: 13px; cursor: pointer; z-index: 3;
+}
+.dropzone.drag { border-color: #4aa3ff; background: rgba(74,163,255,0.15); }
+.dropzone p { margin: 0; }
+.dropzone .status { margin-top: 6px; color: #ff7676; font-size: 12px; min-height: 0; }
+.dropzone .status:empty { display: none; }

apps/viewer-3d/src/ui/fps.ts

@@ -0,0 +1,58 @@
+/**
+ * On-screen FPS meter.
+ *
+ * Driven from the viewer's animate loop: call `sample(now)` once per frame with
+ * the requestAnimationFrame timestamp. It computes an instantaneous fps from the
+ * inter-frame delta, smooths it into a rolling average (EMA), and throttles DOM
+ * writes to ~every 250ms so updating the overlay doesn't itself cause jank.
+ * Kept dependency-free in the src/ui/progress.ts style.
+ */
+
+const DOM_INTERVAL_MS = 250;
+// EMA smoothing factor: higher = more responsive, lower = smoother.
+const EMA_ALPHA = 0.1;
+
+export interface FpsMeter {
+  /** Overlay element; the viewer appends this to its container. */
+  el: HTMLElement;
+  /** Feed one frame timestamp (DOMHighResTimeStamp). */
+  sample(now: number): void;
+  /** Current rolling-average fps. */
+  fps(): number;
+}
+
+/** Create an FPS overlay element + sampler. */
+export function createFpsMeter(): FpsMeter {
+  const el = document.createElement("div");
+  el.className = "fps";
+  el.textContent = "-- FPS";
+
+  let last = 0;
+  let avg = 0;
+  let lastDom = 0;
+
+  return {
+    el,
+    sample(now: number): void {
+      if (last === 0) {
+        last = now;
+        return;
+      }
+      const dt = now - last;
+      last = now;
+      if (dt <= 0) return;
+      const inst = 1000 / dt;
+      avg = avg === 0 ? inst : avg + EMA_ALPHA * (inst - avg);
+
+      if (now - lastDom >= DOM_INTERVAL_MS) {
+        lastDom = now;
+        const v = Math.round(avg);
+        el.textContent = `${v} FPS`;
+        el.style.color = v >= 60 ? "#5cff5c" : v >= 30 ? "#ffb74a" : "#ff5c5c";
+      }
+    },
+    fps(): number {
+      return avg;
+    },
+  };
+}

apps/viewer-3d/src/ui/progress.ts

@@ -0,0 +1,38 @@
+/**
+ * Minimal progress-bar helper for the load lifecycle.
+ *
+ * The #progress container holds a single inner .bar element whose width is
+ * driven as a percentage. show/hide just toggle the `hidden` class so CSS
+ * controls visibility (see src/style.css). Kept dependency-free so both the
+ * dropzone wiring and ThreeDViewer.loadServerAsset can use it.
+ */
+
+/**
+ * Reveal the progress container by removing the `hidden` class.
+ * `el` is the #progress element.
+ */
+export function showProgress(el: HTMLElement): void {
+  el.classList.remove("hidden");
+}
+
+/**
+ * Hide the progress container by adding the `hidden` class.
+ */
+export function hideProgress(el: HTMLElement): void {
+  el.classList.add("hidden");
+}
+
+/**
+ * Set the inner `.bar` width to `percent` (clamped to 0..100).
+ * `el` is the #progress element; its first `.bar` descendant is resized.
+ */
+export function setProgress(el: HTMLElement, percent: number): void {
+  const clamped = Math.max(0, Math.min(100, percent));
+  const bar = el.querySelector<HTMLElement>(".bar");
+  if (bar) bar.style.width = `${clamped}%`;
+}
+
+/** Write a user-facing status/error message into the #status element. */
+export function setStatus(el: HTMLElement, msg: string): void {
+  el.textContent = msg;
+}

apps/viewer-3d/src/viewer/ThreeDViewer.ts

@@ -0,0 +1,368 @@
+import * as THREE from 'three';
+import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js';
+import { getLoaders } from './loaders';
+import { loadModel, extOf } from './modelLoader';
+import { recenterObjFile } from './objRecenter';
+import { createHydrationGate } from './hydration';
+import { showProgress, hideProgress, setProgress } from '../ui/progress';
+import { createFpsMeter } from '../ui/fps';
+import { createAdaptiveQuality } from './adaptiveQuality';
+
+// Formats authored Y-up; the viewer world is Z-up (structure convention), so
+// these are rotated +90° about X on load. OBJ/IFC are Z-up native (no rotate).
+const Y_UP_EXTS = new Set(['glb', 'gltf', 'fbx', 'dae']);
+function isYUp(name: string): boolean {
+  const e = extOf(name);
+  return e !== null && Y_UP_EXTS.has(e);
+}
+
+export class ThreeDViewer {
+  private readonly renderer: THREE.WebGLRenderer;
+  private readonly scene = new THREE.Scene();
+  private readonly perspCamera: THREE.PerspectiveCamera;
+  private readonly orthoCamera: THREE.OrthographicCamera;
+  private camera: THREE.PerspectiveCamera | THREE.OrthographicCamera;
+  private projection: 'persp' | 'ortho' = 'persp';
+  private readonly fov = 50;
+  private readonly controls: OrbitControls;
+  private readonly gate;
+  private readonly onError;
+  private readonly fps = createFpsMeter();
+  private readonly adaptive;
+  private disposed = false;
+  private raf = 0;
+  private current: THREE.Object3D | null = null;
+  private outline: THREE.Group | null = null;
+  private outlineOn = false;
+
+  constructor(
+    private readonly container: HTMLElement,
+    private readonly progress: HTMLElement,
+    preview: HTMLImageElement,
+    onError?: (msg: string) => void,
+  ) {
+    this.onError = onError ?? ((msg: string) => console.error('[hmwebviewer]', msg));
+    this.renderer = new THREE.WebGLRenderer({ antialias: true });
+    this.container.appendChild(this.renderer.domElement);
+    // Adaptive quality owns renderer.setPixelRatio: tier 0 applies a DPR cap of
+    // min(devicePixelRatio, 2) immediately (uncapped DPR on 3x devices is the
+    // #1 cause of <60fps). It then steps the pixel ratio down/up with hysteresis.
+    this.adaptive = createAdaptiveQuality(this.renderer);
+    this.container.appendChild(this.fps.el);
+
+    this.perspCamera = new THREE.PerspectiveCamera(this.fov, 1, 0.1, 1000);
+    this.orthoCamera = new THREE.OrthographicCamera(-1, 1, 1, -1, 0.1, 1000);
+    for (const c of [this.perspCamera, this.orthoCamera]) {
+      c.up.set(0, 0, 1); // Z-up world (right-handed, structure convention)
+      c.position.set(2, -3, 2);
+    }
+    this.camera = this.perspCamera;
+
+    this.controls = new OrbitControls(this.camera, this.renderer.domElement);
+    this.controls.enableDamping = true;
+    // Pan in the ground (XY) plane, not the screen plane — keeps elevation
+    // constant when panning along a road/rail alignment between turntable spins.
+    this.controls.screenSpacePanning = false;
+
+    this.scene.background = new THREE.Color(0xcfcfcf);
+    const hemi = new THREE.HemisphereLight(0xffffff, 0x444444, 1.2);
+    hemi.position.set(0, 0, 1); // sky toward +Z
+    this.scene.add(hemi);
+    const dir = new THREE.DirectionalLight(0xffffff, 1.0);
+    dir.position.set(2, -3, 5); // from above (+Z) and front
+    this.scene.add(dir);
+
+    // Warm the shared singleton loaders so KTX2 detectSupport(renderer) runs at
+    // init; loadModel() reuses the same singletons for GLB/GLTF.
+    getLoaders(this.renderer);
+    this.gate = createHydrationGate(preview);
+
+    window.addEventListener('resize', this.onResize);
+    this.onResize();
+    this.animate();
+    this.gate.markWebGLReady();
+  }
+
+  /** Path A — server asset (SSR placeholder already shown by host page). */
+  loadServerAsset(url: string): void {
+    showProgress(this.progress);
+    loadModel(url, this.renderer, (loaded, total) => {
+      setProgress(this.progress, (loaded / total) * 100);
+    }).then(
+      (obj) => this.onLoaded(obj, isYUp(url)),
+      (err) => {
+        hideProgress(this.progress);
+        this.onError('Failed to load server asset.');
+        console.error('[hmwebviewer] server asset load failed', err);
+      },
+    );
+  }
+
+  /**
+   * Path B — local file (Drag & Drop). Blob URL revoked on both paths.
+   * `sidecars` carries companion files dropped alongside (e.g. a .mtl for OBJ);
+   * the blob: URL can't resolve them, so their text is read and passed inline.
+   */
+  loadLocalFile(file: File, sidecars: File[] = []): void {
+    showProgress(this.progress);
+    const mtlFile = sidecars.find((f) => /\.mtl$/i.test(f.name));
+    const texFiles = sidecars.filter((f) => /\.(png|jpe?g|bmp|gif|webp|tga)$/i.test(f.name));
+    let url: string | null = null;
+    const isObj = extOf(file.name) === 'obj';
+    // OBJLoader builds one giant string; past ~V8 max string length (~1GB of
+    // text) it fails. Route large OBJ through the streaming parser instead.
+    const huge = isObj && file.size > 300 * 1024 * 1024;
+    const run = async (): Promise<THREE.Object3D> => {
+      const mtlText = mtlFile ? await mtlFile.text() : undefined;
+      // Small/medium OBJ: recenter in float64 BEFORE OBJLoader quantizes to
+      // float32 (objRecenter.ts). Huge OBJ recenters inside the streaming parser.
+      const source = (isObj && !huge)
+        ? await recenterObjFile(file, (l, t) => setProgress(this.progress, (l / t) * 100))
+        : file;
+      url = URL.createObjectURL(source);
+      return loadModel(
+        url,
+        this.renderer,
+        (loaded, total) => setProgress(this.progress, (loaded / total) * 100),
+        file.name,
+        { mtlText, texFiles, stream: huge },
+      );
+    };
+    run()
+      .then(
+        (obj) => this.onLoaded(obj, isYUp(file.name)),
+        (err) => {
+          hideProgress(this.progress);
+          this.onError('Failed to load file (corrupt or unsupported?).');
+          console.error('[hmwebviewer] local file load failed', err);
+        },
+      )
+      .finally(() => { if (url) URL.revokeObjectURL(url); });
+  }
+
+  private onLoaded(obj: THREE.Object3D, yUp = false): void {
+    if (this.current) {
+      this.scene.remove(this.current);
+      this.disposeObject(this.current);
+    }
+    this.current = obj;
+    if (yUp) obj.rotateX(Math.PI / 2); // Y-up source → Z-up world
+    this.scene.add(this.current);
+    this.frameObject(this.current);
+    this.applyOutlineState();
+    hideProgress(this.progress);
+    this.gate.markModelLoaded();
+    // observable hook for perf smoke tests (tools/perf-smoke.mjs)
+    window.dispatchEvent(new CustomEvent('hmw:ready', { detail: performance.now() }));
+  }
+
+  private frameObject(obj: THREE.Object3D): void {
+    const box = new THREE.Box3().setFromObject(obj);
+    const size = box.getSize(new THREE.Vector3());
+    const center = box.getCenter(new THREE.Vector3());
+    const maxDim = Math.max(size.x, size.y, size.z) || 1;
+    const fovRad = (this.fov * Math.PI) / 180;
+    const dist = (maxDim / 2) / Math.tan(fovRad / 2) * 2;
+    const near = Math.max(maxDim / 1000, 0.01); // adaptive: fixed far=1000 clips large models
+    const far = (dist + maxDim) * 4;
+    const aspect = this.aspect;
+    const dir = new THREE.Vector3(1, -1, 0.8).normalize(); // iso view, Z up
+    const pos = center.clone().addScaledVector(dir, dist);
+
+    this.perspCamera.position.copy(pos);
+    this.perspCamera.aspect = aspect;
+    this.perspCamera.near = near;
+    this.perspCamera.far = far;
+    this.perspCamera.lookAt(center);
+    this.perspCamera.updateProjectionMatrix();
+
+    // Ortho frustum half-height matches the perspective apparent size at `dist`,
+    // so toggling projection doesn't jump the model scale.
+    const halfH = dist * Math.tan(fovRad / 2);
+    this.orthoCamera.position.copy(pos);
+    this.orthoCamera.top = halfH;
+    this.orthoCamera.bottom = -halfH;
+    this.orthoCamera.left = -halfH * aspect;
+    this.orthoCamera.right = halfH * aspect;
+    this.orthoCamera.zoom = 1;
+    this.orthoCamera.near = near;
+    this.orthoCamera.far = far;
+    this.orthoCamera.lookAt(center);
+    this.orthoCamera.updateProjectionMatrix();
+
+    this.controls.target.copy(center);
+    this.controls.update();
+  }
+
+  /** Re-frame the current model to fit the view (Zoom Fit button). */
+  fitView(): void {
+    if (this.current) this.frameObject(this.current);
+  }
+
+  private applyOutlineState(): void {
+    this.clearOutline();
+    if (this.outlineOn && this.current) this.buildOutline(this.current);
+  }
+
+  /**
+   * Build a feature-edge outline (EdgesGeometry, 30° threshold) — the object's
+   * silhouette + sharp creases as black lines, far sparser than a wireframe.
+   * Built lazily; one-time cost can be seconds on very large meshes.
+   */
+  private buildOutline(obj: THREE.Object3D): void {
+    obj.updateMatrixWorld(true);
+    const group = new THREE.Group();
+    const mat = new THREE.LineBasicMaterial({ color: 0x1a1a1a });
+    obj.traverse((node) => {
+      const mesh = node as THREE.Mesh;
+      if (!mesh.isMesh || !mesh.geometry) return;
+      const seg = new THREE.LineSegments(new THREE.EdgesGeometry(mesh.geometry, 30), mat);
+      mesh.matrixWorld.decompose(seg.position, seg.quaternion, seg.scale);
+      group.add(seg);
+    });
+    this.outline = group;
+    this.scene.add(group);
+  }
+
+  private clearOutline(): void {
+    if (!this.outline) return;
+    this.scene.remove(this.outline);
+    this.outline.traverse((node) => {
+      const seg = node as THREE.LineSegments;
+      if (seg.geometry) seg.geometry.dispose();
+    });
+    const m = (this.outline.children[0] as THREE.LineSegments | undefined)?.material;
+    if (m && !Array.isArray(m)) m.dispose();
+    this.outline = null;
+  }
+
+  /** Toggle the object outline overlay (테두리 button). */
+  toggleOutline(): boolean {
+    this.outlineOn = !this.outlineOn;
+    this.applyOutlineState();
+    return this.outlineOn;
+  }
+
+  /** Switch between perspective and orthographic projection, preserving the view. */
+  setProjection(mode: 'persp' | 'ortho'): void {
+    if (mode === this.projection) return;
+    const target = this.controls.target;
+    const from = this.camera;
+    const fovRad = (this.fov * Math.PI) / 180;
+    const offset = from.position.clone().sub(target);
+    const dist = offset.length() || 1;
+    const aspect = this.aspect;
+
+    if (mode === 'ortho') {
+      const halfH = dist * Math.tan(fovRad / 2);
+      this.orthoCamera.position.copy(from.position);
+      this.orthoCamera.up.copy(from.up);
+      this.orthoCamera.top = halfH;
+      this.orthoCamera.bottom = -halfH;
+      this.orthoCamera.left = -halfH * aspect;
+      this.orthoCamera.right = halfH * aspect;
+      this.orthoCamera.zoom = 1;
+      this.orthoCamera.near = from.near;
+      this.orthoCamera.far = from.far;
+      this.orthoCamera.lookAt(target);
+      this.orthoCamera.updateProjectionMatrix();
+      this.camera = this.orthoCamera;
+    } else {
+      // Place the perspective camera so apparent size matches the ortho view.
+      const orthoHalfH = this.orthoCamera.top / this.orthoCamera.zoom;
+      const d = orthoHalfH / Math.tan(fovRad / 2);
+      this.perspCamera.position.copy(target).add(offset.setLength(d));
+      this.perspCamera.up.copy(from.up);
+      this.perspCamera.aspect = aspect;
+      this.perspCamera.near = from.near;
+      this.perspCamera.far = from.far;
+      this.perspCamera.lookAt(target);
+      this.perspCamera.updateProjectionMatrix();
+      this.camera = this.perspCamera;
+    }
+    this.projection = mode;
+    this.controls.object = this.camera;
+    this.controls.update();
+  }
+
+  private disposeObject(obj: THREE.Object3D): void {
+    const texUrls = obj.userData?.__texUrls as string[] | undefined;
+    if (texUrls) texUrls.forEach((u) => URL.revokeObjectURL(u));
+    obj.traverse((node) => {
+      const mesh = node as THREE.Mesh;
+      if (mesh.geometry) mesh.geometry.dispose();
+      const mat = mesh.material;
+      if (Array.isArray(mat)) mat.forEach((m) => this.disposeMaterial(m));
+      else if (mat) this.disposeMaterial(mat);
+    });
+  }
+
+  private disposeMaterial(mat: THREE.Material): void {
+    for (const v of Object.values(mat)) {
+      if (v instanceof THREE.Texture) v.dispose();
+    }
+    mat.dispose();
+  }
+
+  private get aspect(): number {
+    const w = this.container.clientWidth || window.innerWidth;
+    const h = this.container.clientHeight || window.innerHeight;
+    return w / h;
+  }
+
+  private onResize = (): void => {
+    const w = this.container.clientWidth || window.innerWidth;
+    const h = this.container.clientHeight || window.innerHeight;
+    this.renderer.setSize(w, h, false);
+    const aspect = w / h;
+    this.perspCamera.aspect = aspect;
+    this.perspCamera.updateProjectionMatrix();
+    const halfH = this.orthoCamera.top || 1;
+    this.orthoCamera.left = -halfH * aspect;
+    this.orthoCamera.right = halfH * aspect;
+    this.orthoCamera.updateProjectionMatrix();
+  };
+
+  private animate = (now: number = performance.now()): void => {
+    if (this.disposed) return;
+    this.raf = requestAnimationFrame(this.animate);
+    this.fps.sample(now);
+    this.adaptive.update(this.fps.fps());
+    this.controls.update();
+    this.renderer.render(this.scene, this.camera);
+  };
+
+  dispose(): void {
+    if (this.disposed) return;
+    this.disposed = true;
+    cancelAnimationFrame(this.raf);
+    this.raf = 0;
+    window.removeEventListener('resize', this.onResize);
+    this.controls.dispose();
+    this.clearOutline();
+    if (this.current) this.disposeObject(this.current);
+    this.current = null;
+    this.fps.el.remove();
+    this.renderer.dispose();
+    this.renderer.forceContextLoss();
+    this.renderer.domElement.remove();
+    this.scene.clear();
+  }
+
+  /** Orbit the camera to azimuth (radians) around the model — used by tools/prerender.mjs. */
+  rotateTo(azimuth: number): void {
+    if (!this.current) return;
+    const offset = new THREE.Vector3().subVectors(this.camera.position, this.controls.target);
+    const radius = Math.max(offset.length(), 1e-3);
+    const phi = Math.acos(THREE.MathUtils.clamp(offset.y / radius, -1, 1));
+    const target = this.controls.target;
+    this.camera.position.set(
+      target.x + radius * Math.sin(phi) * Math.sin(azimuth),
+      target.y + radius * Math.cos(phi),
+      target.z + radius * Math.sin(phi) * Math.cos(azimuth),
+    );
+    this.camera.lookAt(target);
+    this.controls.update();
+    this.renderer.render(this.scene, this.camera);
+  }
+}

apps/viewer-3d/src/viewer/adaptiveQuality.ts

@@ -0,0 +1,85 @@
+import * as THREE from "three";
+
+/**
+ * Adaptive-quality controller.
+ *
+ * The single highest-leverage, lowest-risk runtime knob in this codebase is
+ * renderer.setPixelRatio: it re-allocates the drawing buffer to
+ * floor(clientSize * pixelRatio) without touching CSS layout (onResize already
+ * uses updateStyle=false), so there is zero reflow. We walk a tiered ladder of
+ * pixel-ratio steps with hysteresis (asymmetric down/up thresholds + sustained
+ * windows) so the tier cannot oscillate around the 60fps line.
+ *
+ * Antialias is deliberately NOT touched: it is fixed at WebGLRenderer
+ * construction and changing it would force a new context + KTX2 detectSupport,
+ * violating the singleton-loader invariant in src/viewer/loaders.ts.
+ */
+
+const TIER_MIN = 0;
+const TIER_MAX = 4;
+// Sustained-sample windows (in frames at ~60fps): ~1s down, longer to recover.
+const DOWN_FRAMES = 60;
+const UP_FRAMES = 180;
+const DOWN_FPS = 60;
+const UP_FPS = 72;
+
+export interface AdaptiveQuality {
+  /** Feed the current rolling-average fps; may step the tier. */
+  update(avgFps: number): void;
+  /** Current tier index (0 = best). */
+  tier(): number;
+}
+
+export interface AdaptiveQualityOptions {
+  /** Override the tier-0 (best) pixel ratio. Default min(devicePixelRatio, 2). */
+  baseRatio?: number;
+}
+
+/** Create the controller and apply tier 0 immediately. */
+export function createAdaptiveQuality(
+  renderer: THREE.WebGLRenderer,
+  opts: AdaptiveQualityOptions = {},
+): AdaptiveQuality {
+  const base = opts.baseRatio ?? Math.min(window.devicePixelRatio, 2);
+  // Ladder of pixel ratios, highest quality first. Tier 0 = capped DPR.
+  const ratios = [base, 1.5, 1, 0.75, 0.5];
+
+  let tier = 0;
+  let below = 0;
+  let above = 0;
+
+  renderer.setPixelRatio(ratios[tier]);
+
+  function applyTier(next: number): void {
+    tier = next;
+    below = 0;
+    above = 0;
+    const pr = ratios[tier];
+    renderer.setPixelRatio(pr);
+    console.info(`[hmwebviewer] adaptive quality -> tier ${tier} (pr=${pr})`);
+  }
+
+  return {
+    update(avgFps: number): void {
+      // Ignore warm-up / unmeasured frames.
+      if (avgFps <= 0) return;
+
+      if (avgFps < DOWN_FPS) {
+        below++;
+        above = 0;
+        if (below >= DOWN_FRAMES && tier < TIER_MAX) applyTier(tier + 1);
+      } else if (avgFps > UP_FPS) {
+        above++;
+        below = 0;
+        if (above >= UP_FRAMES && tier > TIER_MIN) applyTier(tier - 1);
+      } else {
+        // Dead band: reset both so transient blips don't accumulate.
+        below = 0;
+        above = 0;
+      }
+    },
+    tier(): number {
+      return tier;
+    },
+  };
+}

apps/viewer-3d/src/viewer/hydration.ts

@@ -0,0 +1,35 @@
+// SSR -> CSR hydration gate. Fades the WebP placeholder to the Three.js canvas
+// ONLY after BOTH the WebGL context is ready AND the model is loaded.
+// Firing on just one condition = empty-canvas flash (race). Idempotent.
+
+export interface HydrationGate {
+  markWebGLReady(): void;
+  markModelLoaded(): void;
+}
+
+export function createHydrationGate(preview: HTMLImageElement): HydrationGate {
+  let webglReady = false;
+  let modelLoaded = false;
+  let fired = false;
+
+  function maybeFire(): void {
+    if (fired || !(webglReady && modelLoaded)) return;
+    fired = true;
+    preview.style.opacity = '0';
+    window.setTimeout(() => {
+      preview.classList.add('hidden');
+      preview.style.display = 'none';
+    }, 500);
+  }
+
+  return {
+    markWebGLReady() {
+      webglReady = true;
+      maybeFire();
+    },
+    markModelLoaded() {
+      modelLoaded = true;
+      maybeFire();
+    },
+  };
+}

apps/viewer-3d/src/viewer/loaders.ts

@@ -0,0 +1,26 @@
+import * as THREE from 'three';
+import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader.js';
+import {
+  DRACOLoader,
+  DRACO_GLTF_CONFIG,
+} from 'three/examples/jsm/loaders/DRACOLoader.js';
+import { KTX2Loader } from 'three/examples/jsm/loaders/KTX2Loader.js';
+
+export interface ViewerLoaders {
+  gltf: GLTFLoader;
+  draco: DRACOLoader;
+  ktx2: KTX2Loader;
+}
+
+// 여러 DRACOLoader/KTX2Loader instance를 만들면 충돌할 수 있으므로 하나를 공유합니다.
+// decoder URL은 Three.js import가 생성하는 version 일치 hashed asset을 사용합니다.
+let _cache: ViewerLoaders | null = null;
+
+export function getLoaders(renderer: THREE.WebGLRenderer): ViewerLoaders {
+  if (_cache) return _cache;
+  const draco = new DRACOLoader().setDecoderPath(DRACO_GLTF_CONFIG);
+  const ktx2 = new KTX2Loader().detectSupport(renderer);
+  const gltf = new GLTFLoader().setDRACOLoader(draco).setKTX2Loader(ktx2);
+  _cache = { gltf, draco, ktx2 };
+  return _cache;
+}

apps/viewer-3d/src/viewer/modelLoader.ts

@@ -0,0 +1,307 @@
+import * as THREE from 'three';
+import { publicAssetUrl } from '../runtimeBase';
+import { getLoaders } from './loaders';
+
+/**
+ * Multi-format model loader dispatch.
+ *
+ * GLB/GLTF go through the shared singleton loaders (loaders.ts — Draco + KTX2).
+ * OBJ/FBX/Collada use three's example loaders, lazily imported as separate Vite
+ * chunks so they never bloat the initial bundle. IFC uses web-ifc (single-thread
+ * wasm under /web-ifc/, no COOP/COEP headers required).
+ *
+ * Every branch resolves to a plain THREE.Object3D ready to scene.add — the
+ * caller (ThreeDViewer.onLoaded) does not need to know the source format.
+ */
+export type SupportedExt = 'glb' | 'gltf' | 'obj' | 'fbx' | 'dae' | 'ifc' | 'ply';
+
+export const ACCEPT_EXT: SupportedExt[] = ['glb', 'gltf', 'obj', 'fbx', 'dae', 'ifc', 'ply'];
+
+const EXT_RE = /\.(glb|gltf|obj|fbx|dae|ifc|ply)$/i;
+
+/** Extract the supported extension from a file name / URL, or null. */
+export function extOf(name: string): SupportedExt | null {
+  const m = EXT_RE.exec(name);
+  return m ? (m[1].toLowerCase() as SupportedExt) : null;
+}
+
+type ProgressCb = (loaded: number, total: number) => void;
+
+// Lazy single instances for the example loaders — avoids re-import churn on
+// repeat loads. NOT the Draco/KTX2 singletons (no shared-loader constraint here).
+type OBJLoaderT = import('three/examples/jsm/loaders/OBJLoader.js').OBJLoader;
+type FBXLoaderT = import('three/examples/jsm/loaders/FBXLoader.js').FBXLoader;
+type ColladaLoaderT = import('three/examples/jsm/loaders/ColladaLoader.js').ColladaLoader;
+type PLYLoaderT = import('three/examples/jsm/loaders/PLYLoader.js').PLYLoader;
+
+let _obj: OBJLoaderT | null = null;
+let _fbx: FBXLoaderT | null = null;
+let _dae: ColladaLoaderT | null = null;
+let _ply: PLYLoaderT | null = null;
+
+async function getOBJ(): Promise<OBJLoaderT> {
+  if (_obj) return _obj;
+  const { OBJLoader } = await import('three/examples/jsm/loaders/OBJLoader.js');
+  return (_obj = new OBJLoader());
+}
+
+async function getFBX(): Promise<FBXLoaderT> {
+  if (_fbx) return _fbx;
+  const { FBXLoader } = await import('three/examples/jsm/loaders/FBXLoader.js');
+  return (_fbx = new FBXLoader());
+}
+
+async function getCollada(): Promise<ColladaLoaderT> {
+  if (_dae) return _dae;
+  const { ColladaLoader } = await import('three/examples/jsm/loaders/ColladaLoader.js');
+  return (_dae = new ColladaLoader());
+}
+
+async function getPLY(): Promise<PLYLoaderT> {
+  if (_ply) return _ply;
+  const { PLYLoader } = await import('three/examples/jsm/loaders/PLYLoader.js');
+  return (_ply = new PLYLoader());
+}
+
+function normalizePlyAttributes(geometry: THREE.BufferGeometry): void {
+  for (const name of ['position', 'normal', 'uv', 'color']) {
+    const attribute = geometry.getAttribute(name);
+    if (!attribute || !(attribute.array instanceof Float64Array)) continue;
+    geometry.setAttribute(
+      name,
+      new THREE.Float32BufferAttribute(
+        new Float32Array(attribute.array),
+        attribute.itemSize,
+        attribute.normalized,
+      ),
+    );
+  }
+}
+
+/**
+ * Load any supported model URL and resolve to a scene-addable Object3D.
+ * `nameHint` carries the real file name for ext detection when `url` is a
+ * blob: URL (drag & drop) — blob URLs have no extension.
+ */
+export interface LoadOpts {
+  /** Raw .mtl text for OBJ loads (drag & drop supplies it; blob: URLs can't
+   *  resolve the sibling mtllib). Color-only MTLs apply without any texture fetch. */
+  mtlText?: string;
+  /** Image files dropped alongside an OBJ+MTL (textures the MTL's map_* lines
+   *  reference). Their blob: URLs are mapped onto the requested texture names so
+   *  textures resolve without a server. */
+  texFiles?: File[];
+  /** Parse the OBJ via the streaming parser (objStream.ts) instead of OBJLoader.
+   *  Set for files too large for OBJLoader's single-string parse (>~300MB). */
+  stream?: boolean;
+}
+
+export async function loadModel(
+  url: string,
+  renderer: THREE.WebGLRenderer,
+  onProgress?: ProgressCb,
+  nameHint?: string,
+  opts?: LoadOpts,
+): Promise<THREE.Object3D> {
+  const ext = extOf(nameHint ?? url) ?? extOf(url);
+  const onXhr = (xhr: ProgressEvent): void => {
+    if (onProgress && xhr.total > 0) onProgress(xhr.loaded, xhr.total);
+  };
+
+  switch (ext) {
+    case 'glb':
+    case 'gltf': {
+      const { gltf } = getLoaders(renderer);
+      return new Promise<THREE.Object3D>((resolve, reject) => {
+        gltf.load(url, (g) => resolve(g.scene), onXhr, (err) => reject(err));
+      });
+    }
+    case 'obj': {
+      if (opts?.stream) {
+        const { loadObjStreaming } = await import('./objStream');
+        return loadObjStreaming(url, opts.mtlText, onProgress);
+      }
+      const loader = await getOBJ();
+      const texUrls: string[] = [];
+      // Apply dropped .mtl (color-only) if present; otherwise clear any materials
+      // left on the singleton loader from a previous load.
+      if (opts?.mtlText) {
+        const { MTLLoader } = await import('three/examples/jsm/loaders/MTLLoader.js');
+        const manager = new THREE.LoadingManager();
+        if (opts.texFiles && opts.texFiles.length) {
+          // Map each dropped image's blob: URL onto the texture name the MTL
+          // references (by basename), so map_Kd etc. resolve without a server.
+          const byName = new Map<string, string>();
+          for (const f of opts.texFiles) {
+            const u = URL.createObjectURL(f);
+            texUrls.push(u);
+            byName.set(f.name.toLowerCase(), u);
+          }
+          manager.setURLModifier((u) => {
+            const base = decodeURIComponent((u.split(/[\\/]/).pop() ?? '')).toLowerCase();
+            return byName.get(base) ?? u;
+          });
+        }
+        const mc = new MTLLoader(manager).parse(opts.mtlText, '');
+        mc.preload();
+        loader.setMaterials(mc);
+      } else {
+        (loader as unknown as { materials: unknown }).materials = null;
+      }
+      return new Promise<THREE.Object3D>((resolve, reject) => {
+        loader.load(
+          url,
+          (group) => {
+            group.traverse((node) => {
+              const mat = (node as THREE.Mesh).material;
+              if (!mat) return;
+              (Array.isArray(mat) ? mat : [mat]).forEach((m) => {
+                // CAD OBJ faces often have inconsistent winding; backface culling
+                // tears flat surfaces. Render double-sided.
+                m.side = THREE.DoubleSide;
+                const map = (m as THREE.MeshPhongMaterial).map;
+                if (map) map.colorSpace = THREE.SRGBColorSpace; // color textures are sRGB
+              });
+            });
+            // Texture blob: URLs live with the object; revoked on dispose.
+            if (texUrls.length) group.userData.__texUrls = texUrls;
+            resolve(group);
+          },
+          onXhr,
+          (err) => reject(err),
+        );
+      });
+    }
+    case 'fbx': {
+      const loader = await getFBX();
+      return new Promise<THREE.Object3D>((resolve, reject) => {
+        loader.load(url, (group) => resolve(group), onXhr, (err) => reject(err));
+      });
+    }
+    case 'dae': {
+      const loader = await getCollada();
+      return new Promise<THREE.Object3D>((resolve, reject) => {
+        loader.load(
+          url,
+          (result) => {
+            if (!result) {
+              reject(new Error('Collada loader returned no scene'));
+              return;
+            }
+            resolve(result.scene);
+          },
+          onXhr,
+          (err) => reject(err),
+        );
+      });
+    }
+    case 'ply': {
+      const loader = await getPLY();
+      return new Promise<THREE.Object3D>((resolve, reject) => {
+        loader.load(
+          url,
+          (geometry) => {
+            normalizePlyAttributes(geometry);
+            const hasColor = geometry.hasAttribute('color');
+            if (geometry.index) {
+              // Triangle mesh
+              if (!geometry.hasAttribute('normal')) geometry.computeVertexNormals();
+              const mat = new THREE.MeshStandardMaterial({
+                color: 0xffffff,
+                vertexColors: hasColor,
+                metalness: 0.0,
+                roughness: 1.0,
+                side: THREE.DoubleSide,
+              });
+              resolve(new THREE.Mesh(geometry, mat));
+            } else {
+              // No faces → point cloud
+              const mat = new THREE.PointsMaterial({
+                color: 0xffffff,
+                vertexColors: hasColor,
+                size: 1,
+                sizeAttenuation: false,
+              });
+              resolve(new THREE.Points(geometry, mat));
+            }
+          },
+          onXhr,
+          (err) => reject(err),
+        );
+      });
+    }
+    case 'ifc':
+      return loadIfc(url, onProgress);
+    default:
+      throw new Error('Unsupported model format: ' + url);
+  }
+}
+
+let _ifcApi: import('web-ifc').IfcAPI | null = null;
+
+/** Parse an .ifc into a Group via web-ifc (single-thread wasm, no COOP/COEP). */
+async function loadIfc(url: string, onProgress?: ProgressCb): Promise<THREE.Object3D> {
+  try {
+    const WebIFC = await import('web-ifc');
+    if (!_ifcApi) {
+      _ifcApi = new WebIFC.IfcAPI();
+      _ifcApi.SetWasmPath(publicAssetUrl('web-ifc/'), true);
+      await _ifcApi.Init(undefined, true);
+    }
+    const api = _ifcApi;
+
+    const res = await fetch(url);
+    if (!res.ok) throw new Error('fetch ' + res.status);
+    const buf = await res.arrayBuffer();
+    if (onProgress) onProgress(1, 1);
+    const data = new Uint8Array(buf);
+
+    const modelID = api.OpenModel(data, { COORDINATE_TO_ORIGIN: true });
+    if (modelID < 0) throw new Error('OpenModel returned -1');
+
+    const group = new THREE.Group();
+    const matrix = new THREE.Matrix4();
+    try {
+      api.StreamAllMeshes(modelID, (mesh) => {
+        const placedCount = mesh.geometries.size();
+        for (let i = 0; i < placedCount; i++) {
+          const placed = mesh.geometries.get(i);
+          const geom = api.GetGeometry(modelID, placed.geometryExpressID);
+          const verts = api.GetVertexArray(geom.GetVertexData(), geom.GetVertexDataSize());
+          const indices = api.GetIndexArray(geom.GetIndexData(), geom.GetIndexDataSize());
+          geom.delete();
+
+          // Interleaved [posX,posY,posZ, normX,normY,normZ] — stride 6.
+          const interleaved = new THREE.InterleavedBuffer(verts, 6);
+          const bg = new THREE.BufferGeometry();
+          bg.setAttribute('position', new THREE.InterleavedBufferAttribute(interleaved, 3, 0));
+          bg.setAttribute('normal', new THREE.InterleavedBufferAttribute(interleaved, 3, 3));
+          bg.setIndex(new THREE.BufferAttribute(indices, 1));
+
+          const c = placed.color;
+          const mat = new THREE.MeshStandardMaterial({
+            color: new THREE.Color(c.x, c.y, c.z),
+            metalness: 0.0,
+            roughness: 1.0,
+            side: THREE.DoubleSide,
+          });
+          if (c.w < 1) {
+            mat.transparent = true;
+            mat.opacity = c.w;
+          }
+
+          const three = new THREE.Mesh(bg, mat);
+          matrix.fromArray(placed.flatTransformation);
+          three.applyMatrix4(matrix);
+          group.add(three);
+        }
+      });
+    } finally {
+      api.CloseModel(modelID);
+    }
+    return group;
+  } catch (err) {
+    const msg = err instanceof Error ? err.message : String(err);
+    throw new Error('IFC load failed: ' + msg);
+  }
+}

apps/viewer-3d/src/viewer/objRecenter.ts

@@ -0,0 +1,96 @@
+/**
+ * In-viewer float64 recenter for OBJ files with huge absolute coordinates
+ * (CAD/survey, ~1e8). Done at LOAD time, before OBJLoader quantizes to float32.
+ *
+ * Why here and not after parse: WebGL vertex buffers are float32; at ~1e8 the
+ * float32 ulp is 16-64 units, so vertices snap to that grid, merge, and faces
+ * crack. Subtracting the bbox center from the *source text* (float64) keeps
+ * coords small (~±3e4) so float32 holds full detail — no preprocessed files,
+ * no shader-side double emulation (RTE/two-float), which a single offset of
+ * this magnitude makes unnecessary (relative precision after centering ~3e-5
+ * vs float32 ~1e-7).
+ *
+ * Streamed in two passes (bbox, then rewrite) to keep memory bounded on the
+ * 100-200MB OBJ files this targets.
+ */
+
+const V = 118; // 'v'
+const SP = 32; // ' '
+const RECENTER_THRESHOLD = 1e4; // models nearer the origin than this are left as-is
+
+/** Yield LF-normalized lines from a Blob's stream without buffering the whole file. */
+async function* lines(blob: Blob): AsyncGenerator<string> {
+  const reader = blob.stream().pipeThrough(new TextDecoderStream()).getReader();
+  let buf = '';
+  for (;;) {
+    const { done, value } = await reader.read();
+    if (done) break;
+    buf += value;
+    let i: number;
+    while ((i = buf.indexOf('\n')) >= 0) {
+      let ln = buf.slice(0, i);
+      if (ln.charCodeAt(ln.length - 1) === 13) ln = ln.slice(0, -1); // strip CR
+      yield ln;
+      buf = buf.slice(i + 1);
+    }
+  }
+  if (buf.length) yield buf;
+}
+
+function fmt(n: number): string {
+  return Number.isInteger(n) ? String(n) : String(Math.round(n * 1000) / 1000);
+}
+
+/**
+ * Return an origin-centered copy of `file` as a Blob, or the original `file`
+ * unchanged when it already sits near the origin (small models pay only the
+ * cheap first-pass scan). The returned Blob carries the same OBJ text minus a
+ * per-file integer offset on every `v` line; vn/f/usemtl/mtllib are verbatim.
+ */
+export async function recenterObjFile(
+  file: File,
+  onProgress?: (loaded: number, total: number) => void,
+): Promise<Blob> {
+  // Two streamed passes (bbox, then rewrite) over the file's bytes; report
+  // progress across both, throttled so the DOM isn't touched per line.
+  const total = file.size * 2;
+  let read = 0, tick = 0;
+  const report = (line: string): void => {
+    read += line.length + 1;
+    if (onProgress && (++tick & 0x3fff) === 0) onProgress(read, total); // every ~16k lines
+  };
+
+  let xmin = Infinity, ymin = Infinity, zmin = Infinity;
+  let xmax = -Infinity, ymax = -Infinity, zmax = -Infinity;
+  for await (const line of lines(file)) {
+    report(line);
+    if (line.charCodeAt(0) !== V || line.charCodeAt(1) !== SP) continue;
+    const p = line.split(/\s+/);
+    const x = +p[1], y = +p[2], z = +p[3];
+    if (x < xmin) xmin = x; if (x > xmax) xmax = x;
+    if (y < ymin) ymin = y; if (y > ymax) ymax = y;
+    if (z < zmin) zmin = z; if (z > zmax) zmax = z;
+  }
+  if (!Number.isFinite(xmin)) return file; // no vertices — let OBJLoader handle it
+
+  const cx = (xmin + xmax) / 2, cy = (ymin + ymax) / 2, cz = (zmin + zmax) / 2;
+  if (Math.hypot(cx, cy, cz) < RECENTER_THRESHOLD) return file;
+
+  const ox = Math.round(cx), oy = Math.round(cy), oz = Math.round(cz);
+  const enc = new TextEncoder();
+  const parts: BlobPart[] = [];
+  let out = '';
+  for await (const line of lines(file)) {
+    report(line);
+    if (line.charCodeAt(0) === V && line.charCodeAt(1) === SP) {
+      const p = line.split(/\s+/);
+      out += `v ${fmt(+p[1] - ox)} ${fmt(+p[2] - oy)} ${fmt(+p[3] - oz)}\n`;
+    } else {
+      out += line + '\n';
+    }
+    if (out.length > (1 << 23)) { parts.push(enc.encode(out)); out = ''; } // flush ~8MB
+  }
+  if (out) parts.push(enc.encode(out));
+  if (onProgress) onProgress(total, total);
+  return new Blob(parts, { type: 'text/plain' });
+}

apps/viewer-3d/src/viewer/objStream.ts

@@ -0,0 +1,143 @@
+import * as THREE from 'three';
+
+/**
+ * Streaming OBJ parser for files too large for OBJLoader.
+ *
+ * OBJLoader builds one giant string of the whole file; past ~512MB-1GB of text
+ * that exceeds the V8 max string length and fails (empty geometry). This parses
+ * the file in two streamed passes (count, then fill) so it never holds the whole
+ * text, building an INDEXED BufferGeometry (positions indexed by vertex, normals
+ * computed). Memory stays ~O(vertices + triangles) of typed arrays.
+ *
+ * Trade-offs vs OBJLoader (acceptable for huge structural CAD exports):
+ *  - smooth (computed) normals, not per-face-corner — hard edges soften.
+ *  - per-vertex color from the active material's Kd (one draw call, no textures).
+ *  - float64 recenter baked in (huge absolute coords don't crack float32).
+ */
+
+const SP = 32; // ' '
+const V = 118; // 'v'
+const F = 102; // 'f'
+const U = 117; // 'u' (usemtl)
+const RECENTER_THRESHOLD = 1e4;
+
+async function* streamLines(url: string): AsyncGenerator<string> {
+  const resp = await fetch(url);
+  if (!resp.ok || !resp.body) throw new Error('fetch failed: ' + resp.status);
+  const reader = resp.body.pipeThrough(new TextDecoderStream()).getReader();
+  let buf = '';
+  for (;;) {
+    const { done, value } = await reader.read();
+    if (done) break;
+    buf += value;
+    let i: number;
+    while ((i = buf.indexOf('\n')) >= 0) {
+      let ln = buf.slice(0, i);
+      if (ln.charCodeAt(ln.length - 1) === 13) ln = ln.slice(0, -1); // strip CR
+      yield ln;
+      buf = buf.slice(i + 1);
+    }
+  }
+  if (buf.length) yield buf;
+}
+
+function parseMtlColors(text: string): Map<string, [number, number, number]> {
+  const map = new Map<string, [number, number, number]>();
+  let cur = '';
+  for (const raw of text.split('\n')) {
+    const line = raw.trim();
+    if (line.startsWith('newmtl ')) cur = line.slice(7).trim();
+    else if (cur && line.startsWith('Kd ')) {
+      const p = line.split(/\s+/);
+      map.set(cur, [+p[1], +p[2], +p[3]]);
+    }
+  }
+  return map;
+}
+
+export async function loadObjStreaming(
+  url: string,
+  mtlText?: string,
+  onProgress?: (loaded: number, total: number) => void,
+): Promise<THREE.Object3D> {
+  // PASS 1 — count vertices + triangles, accumulate bbox in float64.
+  let nV = 0, nTri = 0;
+  let xmin = Infinity, ymin = Infinity, zmin = Infinity;
+  let xmax = -Infinity, ymax = -Infinity, zmax = -Infinity;
+  for await (const line of streamLines(url)) {
+    const c0 = line.charCodeAt(0);
+    if (c0 === V && line.charCodeAt(1) === SP) {
+      nV++;
+      const p = line.split(/\s+/);
+      const x = +p[1], y = +p[2], z = +p[3];
+      if (x < xmin) xmin = x; if (x > xmax) xmax = x;
+      if (y < ymin) ymin = y; if (y > ymax) ymax = y;
+      if (z < zmin) zmin = z; if (z > zmax) zmax = z;
+    } else if (c0 === F && line.charCodeAt(1) === SP) {
+      let corners = 0;
+      const p = line.split(/\s+/);
+      for (let k = 1; k < p.length; k++) if (p[k]) corners++;
+      if (corners >= 3) nTri += corners - 2;
+    }
+  }
+  if (nV === 0) throw new Error('OBJ has no vertices');
+
+  const cx = (xmin + xmax) / 2, cy = (ymin + ymax) / 2, cz = (zmin + zmax) / 2;
+  const far = Math.hypot(cx, cy, cz) >= RECENTER_THRESHOLD;
+  const ox = far ? Math.round(cx) : 0, oy = far ? Math.round(cy) : 0, oz = far ? Math.round(cz) : 0;
+
+  // PASS 2 — fill typed arrays.
+  const positions = new Float32Array(nV * 3);
+  const index = new Uint32Array(nTri * 3);
+  const colorMap = mtlText ? parseMtlColors(mtlText) : null;
+  const colors = colorMap && colorMap.size ? new Float32Array(nV * 3) : null;
+  let vi = 0, ii = 0;
+  let cr = 0.8, cg = 0.8, cb = 0.8;
+  const total = nV + nTri; let done = 0;
+
+  for await (const line of streamLines(url)) {
+    const c0 = line.charCodeAt(0), c1 = line.charCodeAt(1);
+    if (c0 === V && c1 === SP) {
+      const p = line.split(/\s+/);
+      positions[vi * 3] = +p[1] - ox;
+      positions[vi * 3 + 1] = +p[2] - oy;
+      positions[vi * 3 + 2] = +p[3] - oz;
+      vi++;
+      if ((++done & 0x3ffff) === 0) onProgress?.(done, total);
+    } else if (c0 === F && c1 === SP) {
+      const p = line.split(/\s+/);
+      const vs: number[] = [];
+      for (let k = 1; k < p.length; k++) {
+        if (!p[k]) continue;
+        const slash = p[k].indexOf('/');
+        let idx = parseInt(slash >= 0 ? p[k].slice(0, slash) : p[k], 10);
+        idx = idx < 0 ? nV + idx : idx - 1; // negative = relative; OBJ is 1-based
+        vs.push(idx);
+      }
+      if (colors) for (const v of vs) { colors[v * 3] = cr; colors[v * 3 + 1] = cg; colors[v * 3 + 2] = cb; }
+      for (let t = 1; t + 1 < vs.length; t++) { // fan triangulate
+        index[ii++] = vs[0]; index[ii++] = vs[t]; index[ii++] = vs[t + 1];
+      }
+      if ((++done & 0x3ffff) === 0) onProgress?.(done, total);
+    } else if (c0 === U && line.startsWith('usemtl ')) {
+      const c = colorMap?.get(line.slice(7).trim());
+      if (c) { cr = c[0]; cg = c[1]; cb = c[2]; }
+    }
+  }
+
+  const geom = new THREE.BufferGeometry();
+  geom.setAttribute('position', new THREE.BufferAttribute(positions, 3));
+  if (colors) geom.setAttribute('color', new THREE.BufferAttribute(colors, 3));
+  geom.setIndex(new THREE.BufferAttribute(index, 1));
+  geom.computeVertexNormals();
+  onProgress?.(total, total);
+
+  const mat = new THREE.MeshStandardMaterial({
+    color: colors ? 0xffffff : 0xcccccc,
+    vertexColors: !!colors,
+    metalness: 0.0,
+    roughness: 1.0,
+    side: THREE.DoubleSide,
+  });
+  return new THREE.Mesh(geom, mat);
+}

apps/viewer-3d/tools/README.md

@@ -0,0 +1,76 @@
+# tools/ — Offline asset pipeline
+
+Offline tooling for preparing 3D assets served by the hmwebviewer. Nothing here
+ships to the browser at runtime; these produce the optimized assets and
+pre-rendered placeholders that the viewer consumes.
+
+## preprocess.mjs — Draco + KTX2 compression
+
+Compresses a `.glb`/`.gltf` into a single self-contained `.optimized.glb` using
+[gltf-transform](https://gltf-transform.dev/): Draco for geometry, KTX2/Basis
+Universal for textures, in one pass. Output loads directly in the viewer's
+`GLTFLoader` (with `DRACOLoader` + `KTX2Loader` wired on the shared loader).
+
+### Install (once)
+
+These dev dependencies are **not** in `package.json` yet. Run before first use:
+
+```bash
+npm install -D @gltf-transform/core @gltf-transform/functions \
+                @gltf-transform/extensions @gltf-transform/cli
+```
+
+The CLI package provides the KTX2 encoder wiring. gltf-transform fetches the
+platform basis encoder automatically on first KTX2 run (network needed once).
+
+### Usage
+
+```bash
+node tools/preprocess.mjs <input.glb> [output.glb] [--draco-bits N] [--ktx2|--no-ktx2]
+```
+
+- Default output: `<input>.optimized.glb` (e.g. `model.glb` → `model.optimized.glb`).
+- `--draco-bits N` — position quantization bits, 8..16 (default **14**). Lower =
+  smaller file, lossier geometry. Tune per asset.
+- `--ktx2` / `--no-ktx2` — texture encoding toggle (default **on**).
+
+Prints before/after byte sizes and reduction %.
+
+### Outputs
+
+- Compressed GLBs land in [`samples/`](../samples/) (`samples/*.optimized.glb`).
+- Pre-rendered WebP placeholders land in [`public/previews/`](../public/previews/)
+  (`*.webp`) — see the pre-render section below.
+
+If a required package is missing at runtime, the script prints the install
+command above and exits non-zero (no silent skip).
+
+## Sample assets
+
+Place source `.glb` files under `samples/` (suggested split: small / medium /
+large). Compress with `preprocess.mjs` and commit the `.optimized.glb` outputs.
+Samples are not committed yet — to be added when a sample asset is available.
+
+## Pre-render pipeline (360° animated WebP placeholder)
+
+For Path A (server asset) the server ships a pre-rendered 360° turntable so the
+page shows motion instantly while the real model decodes in the background.
+Output: `public/previews/<asset>.webp` (animated, with alpha).
+
+**Status: to be implemented when a sample asset is available.** Two options:
+
+1. **Blender headless CLI (preferred).** Camera parented to an empty at the
+   model origin, Z axis 0→360° keyframed over N frames. Render frames:
+   ```bash
+   blender -b scene.blend -o //frame_### -f 1..N -F PNG
+   ```
+   Assemble to animated WebP (alpha) or WebM VP9 via ffmpeg:
+   ```bash
+   ffmpeg -framerate 24 -i frame_%03d.png -loop 0 -plays 0 out.webp
+   ```
+
+2. **Puppeteer + headless three.js (fallback).** Spin a minimal three.js page,
+   rotate the model, and call `page.screenshot({ type: 'webp' })` per rotation
+   step. Stitch frames into an animated WebP.
+
+Both options need a committed sample asset first; blocked on P4-2.

apps/viewer-3d/tools/adaptive-smoke.mjs

@@ -0,0 +1,95 @@
+#!/usr/bin/env node
+/**
+ * tools/adaptive-smoke.mjs — empirically trigger the adaptive-quality downstep.
+ *
+ * Loads a heavy sample in headless Chrome (software GL = slow) + applies a CDP
+ * CPU throttle so the REAL measured fps sustains < 60. Captures the genuine
+ * `[hmwebviewer] adaptive quality -> tier N (pr=..)` console logs emitted by
+ * src/viewer/adaptiveQuality.ts, plus the live #.fps overlay text. Proves the
+ * <60fps → optimize path fires on real frame measurement (no logic patched).
+ *
+ * USAGE: node tools/adaptive-smoke.mjs [--url URL] [--asset PATH] [--throttle N] [--seconds S]
+ */
+import puppeteer from 'puppeteer-core';
+import { existsSync } from 'node:fs';
+
+const CHROME_CANDIDATES = [
+  'C:/Program Files/Google/Chrome/Application/chrome.exe',
+  'C:/Program Files (x86)/Google/Chrome/Application/chrome.exe',
+  'C:/Program Files (x86)/Microsoft/Edge/Application/msedge.exe',
+];
+function findBrowser() {
+  if (process.env.PUPPETEER_EXECUTABLE_PATH && existsSync(process.env.PUPPETEER_EXECUTABLE_PATH)) return process.env.PUPPETEER_EXECUTABLE_PATH;
+  for (const p of CHROME_CANDIDATES) if (existsSync(p)) return p;
+  return null;
+}
+
+function parseArgs(argv) {
+  const a = argv.slice(2);
+  let url = 'http://127.0.0.1:4173', asset = '/samples/ABeautifulGame.ktx2.glb', throttle = 6, seconds = 25;
+  for (let i = 0; i < a.length; i++) {
+    if (a[i] === '--url') url = a[++i];
+    else if (a[i] === '--asset') asset = a[++i];
+    else if (a[i] === '--throttle') throttle = Number(a[++i]);
+    else if (a[i] === '--seconds') seconds = Number(a[++i]);
+  }
+  return { url, asset, throttle, seconds };
+}
+
+const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
+
+async function main() {
+  const o = parseArgs(process.argv);
+  const exe = findBrowser();
+  if (!exe) { console.error('[adaptive-smoke] No Chrome/Edge found.'); process.exit(1); }
+
+  const browser = await puppeteer.launch({
+    executablePath: exe,
+    headless: 'new',
+    args: ['--no-sandbox', '--use-gl=swiftshader', '--enable-webgl', '--ignore-gpu-blocklist'],
+  });
+  const page = await browser.newPage();
+
+  const tierLogs = [];
+  page.on('console', (m) => {
+    const t = m.text();
+    if (t.includes('adaptive quality')) { tierLogs.push(t); console.log('  LOG ' + t); }
+  });
+
+  await page.evaluateOnNewDocument(() => {
+    window.__hmwReady = null;
+    window.addEventListener('hmw:ready', (e) => { window.__hmwReady = e.detail; });
+  });
+
+  const target = o.url + '?model=' + o.asset;
+  console.log('[adaptive-smoke] ' + target + '  throttle=' + o.throttle + 'x  watch=' + o.seconds + 's  browser=' + exe);
+  await page.goto(target, { waitUntil: 'domcontentloaded', timeout: 30000 });
+  await page.waitForFunction('window.__hmwReady != null', { timeout: 60000 });
+  console.log('[adaptive-smoke] model loaded; applying CPU throttle + watching fps...');
+
+  const client = await page.target().createCDPSession();
+  await client.send('Emulation.setCPUThrottlingRate', { rate: o.throttle });
+
+  const start = Date.now();
+  while (Date.now() - start < o.seconds * 1000) {
+    await sleep(2000);
+    const state = await page.evaluate(() => {
+      const el = document.querySelector('.fps');
+      return { fps: el ? el.textContent : '(no overlay)', pr: window.__viewer ? undefined : undefined };
+    });
+    console.log('  t+' + Math.round((Date.now() - start) / 1000) + 's  overlay=' + state.fps + '  tierSteps=' + tierLogs.length);
+    if (tierLogs.length >= 3) break; // enough proof
+  }
+
+  await browser.close();
+
+  console.log('\n[adaptive-smoke] tier-change log lines captured: ' + tierLogs.length);
+  tierLogs.forEach((l) => console.log('  ' + l));
+  if (tierLogs.length === 0) {
+    console.error('[adaptive-smoke] NO downstep observed — fps stayed >=60 (raise --throttle or use a heavier asset).');
+    process.exit(2);
+  }
+  console.log('[adaptive-smoke] PASS — adaptive quality degraded on sustained <60fps.');
+}
+
+main().catch((e) => { console.error('[adaptive-smoke] Fatal: ' + (e && e.stack ? e.stack : e)); process.exit(1); });

apps/viewer-3d/tools/copy-decoders.mjs

@@ -0,0 +1,30 @@
+// IFC single-thread WASM을 public/에 staging합니다.
+// `npm install`의 postinstall에서 자동 실행되며 반복 실행해도 같은 결과를 만듭니다.
+import {
+  chmodSync,
+  copyFileSync,
+  existsSync,
+  mkdirSync,
+  rmSync,
+} from 'node:fs';
+import { dirname, resolve } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const root = resolve(__dirname, '..');
+
+// 현재 IFC 경로는 COOP/COEP가 필요 없는 single-thread WASM만 사용합니다.
+const ifcEntry = fileURLToPath(import.meta.resolve('web-ifc'));
+const ifcSrcDir = dirname(ifcEntry);
+const ifcDest = resolve(root, 'public/web-ifc');
+if (existsSync(ifcSrcDir)) {
+  rmSync(ifcDest, { force: true, recursive: true });
+  mkdirSync(ifcDest, { recursive: true });
+  const src = resolve(ifcSrcDir, 'web-ifc.wasm');
+  const dest = resolve(ifcDest, 'web-ifc.wasm');
+  copyFileSync(src, dest);
+  chmodSync(dest, 0o644);
+  console.log(`[copy-decoders] ${src} -> ${dest}`);
+} else {
+  console.warn('[copy-decoders] web-ifc not installed yet — skipping IFC wasm.');
+}

apps/viewer-3d/tools/dnd-smoke.mjs

@@ -0,0 +1,84 @@
+#!/usr/bin/env node
+/**
+ * tools/dnd-smoke.mjs — CSR (Path B / drag&drop) load smoke.
+ *
+ * The per-format perf-smoke only exercised Path A (?model=). This drives the
+ * REAL local-file path: fetch each sample into a File, hand it to
+ * window.__viewer.loadLocalFile(file) (exactly what the dropzone does), and wait
+ * for hmw:ready. Catches the blob:-URL-has-no-extension class of bug.
+ *
+ * USAGE: node tools/dnd-smoke.mjs [--url URL] [--asset /samples/x ...]
+ *   (run `npm run build && npm run preview` first)
+ */
+import puppeteer from 'puppeteer-core';
+import { existsSync } from 'node:fs';
+
+const CHROME_CANDIDATES = [
+  'C:/Program Files/Google/Chrome/Application/chrome.exe',
+  'C:/Program Files (x86)/Google/Chrome/Application/chrome.exe',
+  'C:/Program Files (x86)/Microsoft/Edge/Application/msedge.exe',
+];
+function findBrowser() {
+  if (process.env.PUPPETEER_EXECUTABLE_PATH && existsSync(process.env.PUPPETEER_EXECUTABLE_PATH)) return process.env.PUPPETEER_EXECUTABLE_PATH;
+  for (const p of CHROME_CANDIDATES) if (existsSync(p)) return p;
+  return null;
+}
+function parseArgs(argv) {
+  const a = argv.slice(2); let url = 'http://127.0.0.1:4173'; const assets = [];
+  for (let i = 0; i < a.length; i++) {
+    if (a[i] === '--url') url = a[++i]; else if (a[i] === '--asset') assets.push(a[++i]);
+  }
+  if (!assets.length) assets.push('/samples/Box.glb', '/samples/Duck.glb', '/samples/Avocado.glb', '/samples/Cube.obj', '/samples/Cube.fbx', '/samples/Cube.dae', '/samples/Cube.ifc');
+  return { url, assets };
+}
+
+async function dropOne(page, base, asset) {
+  await page.goto(base, { waitUntil: 'domcontentloaded', timeout: 30000 });
+  await page.waitForFunction('window.__viewer != null', { timeout: 15000 });
+  try {
+    const res = await page.evaluate(async (assetPath) => {
+      const name = assetPath.split('/').pop();
+      const resp = await fetch(assetPath);
+      if (!resp.ok) return { ok: false, err: 'fetch ' + resp.status };
+      const blob = await resp.blob();
+      const file = new File([blob], name, { type: blob.type || 'application/octet-stream' });
+      const ready = new Promise((resolve) => {
+        const onErr = (e) => resolve({ ok: false, err: 'viewer error: ' + (e.detail || 'unknown') });
+        window.addEventListener('hmw:ready', () => resolve({ ok: true }), { once: true });
+        // surface our own onError via console; also time out below
+        window.__dndTimeout = setTimeout(() => resolve({ ok: false, err: 'timeout (no hmw:ready)' }), 20000);
+      });
+      window.__viewer.loadLocalFile(file);
+      return ready;
+    }, asset);
+    return { asset, ...res };
+  } catch (e) {
+    return { asset, ok: false, err: (e && e.message) || String(e) };
+  }
+}
+
+async function main() {
+  const o = parseArgs(process.argv);
+  const exe = findBrowser();
+  if (!exe) { console.error('[dnd-smoke] No Chrome/Edge found.'); process.exit(1); }
+  const browser = await puppeteer.launch({ executablePath: exe, headless: 'new', args: ['--no-sandbox', '--use-gl=swiftshader', '--enable-webgl', '--ignore-gpu-blocklist'] });
+  const page = await browser.newPage();
+  const errs = [];
+  page.on('console', (m) => { const t = m.text(); if (t.includes('load failed') || t.includes('Failed to load')) errs.push(t); });
+
+  console.log('[dnd-smoke] CSR drag&drop path, base=' + o.url);
+  const results = [];
+  for (const asset of o.assets) {
+    process.stdout.write('  drop ' + asset + ' ... ');
+    const r = await dropOne(page, o.url, asset);
+    results.push(r);
+    console.log(r.ok ? 'OK' : 'FAIL (' + r.err + ')');
+  }
+  await browser.close();
+
+  const failed = results.filter((r) => !r.ok);
+  console.log('\n[dnd-smoke] ' + (results.length - failed.length) + '/' + results.length + ' passed');
+  if (failed.length) { console.error('[dnd-smoke] FAILURES: ' + failed.map((f) => f.asset).join(', ')); process.exit(1); }
+  console.log('[dnd-smoke] all local drops load.');
+}
+main().catch((e) => { console.error('[dnd-smoke] Fatal: ' + (e && e.stack ? e.stack : e)); process.exit(1); });

apps/viewer-3d/tools/girder-smoke.mjs

@@ -0,0 +1,78 @@
+#!/usr/bin/env node
+/**
+ * Diagnostic: load a huge OBJ (+mtl) through the REAL drag&drop path in headless
+ * Chrome, capture console ([recenter]/[hmw] bbox) and a screenshot. Confirms
+ * whether the in-viewer recenter ran and whether faces crack.
+ *
+ * USAGE: node tools/girder-smoke.mjs [--url http://localhost:3333] [obj] [mtl]
+ */
+import puppeteer from 'puppeteer-core';
+import { existsSync } from 'node:fs';
+import { resolve } from 'node:path';
+
+const CHROME = [
+  'C:/Program Files/Google/Chrome/Application/chrome.exe',
+  'C:/Program Files (x86)/Google/Chrome/Application/chrome.exe',
+  'C:/Program Files (x86)/Microsoft/Edge/Application/msedge.exe',
+].find((p) => existsSync(p));
+
+const args = process.argv.slice(2);
+let url = 'http://localhost:3333';
+const files = [];
+for (let i = 0; i < args.length; i++) {
+  if (args[i] === '--url') url = args[++i];
+  else files.push(args[i]);
+}
+if (files.length === 0) {
+  files.push('samples/GirderObjs/part01.obj', 'samples/GirderObjs/part01.mtl');
+}
+const paths = files.map((f) => resolve(f));
+for (const p of paths) if (!existsSync(p)) { console.error('missing', p); process.exit(1); }
+
+const browser = await puppeteer.launch({
+  executablePath: CHROME,
+  headless: 'new',
+  args: ['--no-sandbox', '--use-gl=swiftshader', '--enable-webgl', '--ignore-gpu-blocklist',
+    '--disable-dev-shm-usage', '--window-size=1400,900'],
+});
+const page = await browser.newPage();
+await page.setViewport({ width: 1400, height: 900 });
+page.on('console', (m) => console.log('  [browser]', m.text()));
+page.on('pageerror', (e) => console.log('  [pageerror]', e.message));
+
+await page.evaluateOnNewDocument(() => {
+  window.__hmwReady = null;
+  window.addEventListener('hmw:ready', (e) => { window.__hmwReady = e.detail; });
+});
+
+console.log('goto', url);
+await page.goto(url, { waitUntil: 'domcontentloaded', timeout: 30000 });
+await page.waitForSelector('#file-input', { timeout: 10000 });
+
+const input = await page.$('#file-input');
+console.log('uploading', paths.join(', '));
+await input.uploadFile(...paths);
+await page.evaluate(() => document.getElementById('file-input')
+  .dispatchEvent(new Event('change', { bubbles: true })));
+
+console.log('waiting for hmw:ready (up to 240s)...');
+const t0 = Date.now();
+try {
+  await page.waitForFunction('window.__hmwReady != null', { timeout: 240000, polling: 1000 });
+  console.log('READY in', ((Date.now() - t0) / 1000).toFixed(1) + 's');
+} catch {
+  console.log('TIMEOUT after', ((Date.now() - t0) / 1000).toFixed(1) + 's — capturing anyway');
+}
+
+await new Promise((r) => setTimeout(r, 1500));
+await page.screenshot({ path: resolve('girder-smoke.png') });
+console.log('screenshot -> girder-smoke.png (full)');
+
+// Medium zoom (reproduce user's close inspection) via OrbitControls wheel.
+await page.mouse.move(700, 450);
+for (let i = 0; i < 14; i++) { await page.mouse.wheel({ deltaY: -200 }); await new Promise((r) => setTimeout(r, 20)); }
+await new Promise((r) => setTimeout(r, 1000));
+await page.screenshot({ path: resolve('girder-zoom.png') });
+console.log('screenshot -> girder-zoom.png (zoomed in)');
+
+await browser.close();

apps/viewer-3d/tools/perf-smoke.mjs

@@ -0,0 +1,117 @@
+#!/usr/bin/env node
+/**
+ * tools/perf-smoke.mjs — Perceived-load smoke test for hmwebviewer (PLAN P5-3).
+ *
+ * Launches headless Chrome via puppeteer-core (uses the system Chrome; no
+ * Chromium download). For each sample asset it loads `?model=<asset>` and
+ * measures wall time from navigation-start to the viewer's `hmw:ready` event
+ * (dispatched in ThreeDViewer.onLoaded). Asserts < 3000ms perceived.
+ *
+ * USAGE
+ *   node tools/perf-smoke.mjs [--url http://127.0.0.1:4173] [--asset /samples/Box.glb ...]
+ *
+ * Defaults: url = http://127.0.0.1:4173 (vite preview); assets = the sample set.
+ * Run `npm run build && npm run preview` first (or `npm run dev` on its port).
+ *
+ * Browser auto-detected: Chrome, then Edge, then PUPPETEER_EXECUTABLE_PATH.
+ */
+import puppeteer from 'puppeteer-core';
+import { existsSync } from 'node:fs';
+
+const CHROME_CANDIDATES = [
+  'C:/Program Files/Google/Chrome/Application/chrome.exe',
+  'C:/Program Files (x86)/Google/Chrome/Application/chrome.exe',
+  'C:/Program Files (x86)/Microsoft/Edge/Application/msedge.exe',
+];
+
+function findBrowser() {
+  if (process.env.PUPPETEER_EXECUTABLE_PATH && existsSync(process.env.PUPPETEER_EXECUTABLE_PATH)) {
+    return process.env.PUPPETEER_EXECUTABLE_PATH;
+  }
+  for (const p of CHROME_CANDIDATES) if (existsSync(p)) return p;
+  return null;
+}
+
+function parseArgs(argv) {
+  const args = argv.slice(2);
+  let url = 'http://127.0.0.1:4173';
+  const assets = [];
+  for (let i = 0; i < args.length; i++) {
+    if (args[i] === '--url') url = args[++i];
+    else if (args[i] === '--asset') assets.push(args[++i]);
+    else if (args[i] === '-h' || args[i] === '--help') return { help: true };
+  }
+  if (assets.length === 0) {
+    assets.push('/samples/Box.glb', '/samples/Duck.glb', '/samples/Duck.optimized.glb', '/samples/Avocado.glb');
+  }
+  return { url, assets };
+}
+
+const THRESHOLD_MS = 3000;
+
+async function measureAsset(browser, baseUrl, asset) {
+  const page = await browser.newPage();
+  await page.evaluateOnNewDocument(() => {
+    window.__hmwReady = null;
+    window.addEventListener('hmw:ready', (e) => { window.__hmwReady = e.detail; });
+  });
+  const target = baseUrl + '?model=' + asset;
+  const t0 = Date.now();
+  try {
+    await page.goto(target, { waitUntil: 'domcontentloaded', timeout: 30000 });
+    await page.waitForFunction('window.__hmwReady != null', { timeout: 30000 });
+    const data = await page.evaluate(() => ({ readyPerf: window.__hmwReady, origin: performance.timeOrigin }));
+    const ms = (data.origin + data.readyPerf) - t0;
+    return { asset, ms: Math.round(ms), ok: ms < THRESHOLD_MS };
+  } catch (e) {
+    return { asset, ms: null, ok: false, error: (e && e.message) ? e.message : String(e) };
+  } finally {
+    await page.close();
+  }
+}
+
+async function main() {
+  const opts = parseArgs(process.argv);
+  if (opts.help) {
+    console.error('Usage: node tools/perf-smoke.mjs [--url URL] [--asset PATH ...]');
+    process.exit(0);
+  }
+  const exe = findBrowser();
+  if (!exe) {
+    console.error('[perf-smoke] No Chrome/Edge found. Set PUPPETEER_EXECUTABLE_PATH.');
+    process.exit(1);
+  }
+
+  const browser = await puppeteer.launch({
+    executablePath: exe,
+    headless: 'new',
+    args: ['--no-sandbox', '--use-gl=swiftshader', '--enable-webgl', '--ignore-gpu-blocklist'],
+  });
+
+  console.log('[perf-smoke] base=' + opts.url + '  browser=' + exe);
+  console.log('[perf-smoke] threshold=' + THRESHOLD_MS + 'ms perceived');
+  const results = [];
+  for (const asset of opts.assets) {
+    process.stdout.write('  ' + asset + ' ... ');
+    const r = await measureAsset(browser, opts.url, asset);
+    results.push(r);
+    console.log(r.ms === null ? 'FAIL (' + (r.error || 'timeout') + ')' : (r.ms + 'ms ' + (r.ok ? 'OK' : 'OVER')));
+  }
+  await browser.close();
+
+  console.log('\n[perf-smoke] summary');
+  for (const r of results) {
+    console.log('  ' + r.asset.padEnd(34) + (r.ms === null ? 'FAIL' : (r.ms + 'ms').padEnd(8)) + (r.ok ? 'PASS' : 'FAIL'));
+  }
+  const failed = results.filter((r) => !r.ok);
+  if (failed.length) {
+    console.error('[perf-smoke] ' + failed.length + ' asset(s) over threshold/failed.');
+    process.exit(1);
+  }
+  console.log('[perf-smoke] all within ' + THRESHOLD_MS + 'ms.');
+}
+
+main().catch((e) => {
+  console.error('[perf-smoke] Fatal: ' + (e && e.stack ? e.stack : e));
+  process.exit(1);
+});

apps/viewer-3d/tools/ply-test.mjs

@@ -0,0 +1,65 @@
+#!/usr/bin/env node
+/** Generate an ASCII PLY cube (vertex colors) and load it via the drag&drop path
+ *  in headless Chrome; screenshot to verify PLY support. */
+import puppeteer from 'puppeteer-core';
+import { existsSync, mkdirSync, writeFileSync } from 'node:fs';
+import { resolve } from 'node:path';
+
+const PLY = `ply
+format ascii 1.0
+element vertex 8
+property float x
+property float y
+property float z
+property uchar red
+property uchar green
+property uchar blue
+element face 12
+property list uchar int vertex_indices
+end_header
+-1 -1 -1 255 0 0
+1 -1 -1 0 255 0
+1 1 -1 0 0 255
+-1 1 -1 255 255 0
+-1 -1 1 255 0 255
+1 -1 1 0 255 255
+1 1 1 255 255 255
+-1 1 1 90 90 90
+3 0 1 2
+3 0 2 3
+3 4 5 6
+3 4 6 7
+3 0 4 7
+3 0 7 3
+3 1 5 6
+3 1 6 2
+3 3 2 6
+3 3 6 7
+3 0 1 5
+3 0 5 4
+`;
+const dir = resolve('samples/plytest');
+mkdirSync(dir, { recursive: true });
+writeFileSync(resolve(dir, 'cube.ply'), PLY);
+console.log('asset ->', resolve(dir, 'cube.ply'));
+
+const url = process.argv.includes('--url') ? process.argv[process.argv.indexOf('--url') + 1] : 'http://localhost:3333';
+const CHROME = ['C:/Program Files/Google/Chrome/Application/chrome.exe',
+  'C:/Program Files (x86)/Microsoft/Edge/Application/msedge.exe'].find((p) => existsSync(p));
+const browser = await puppeteer.launch({ executablePath: CHROME, headless: 'new',
+  args: ['--no-sandbox', '--use-gl=swiftshader', '--enable-webgl', '--ignore-gpu-blocklist', '--window-size=900,700'] });
+const page = await browser.newPage();
+await page.setViewport({ width: 900, height: 700 });
+page.on('console', (m) => console.log('  [browser]', m.text()));
+page.on('pageerror', (e) => console.log('  [pageerror]', e.message));
+await page.evaluateOnNewDocument(() => { window.__r = null; addEventListener('hmw:ready', (e) => { window.__r = e.detail; }); });
+await page.goto(url, { waitUntil: 'domcontentloaded', timeout: 30000 });
+await page.waitForSelector('#file-input');
+await (await page.$('#file-input')).uploadFile(resolve(dir, 'cube.ply'));
+await page.evaluate(() => document.getElementById('file-input').dispatchEvent(new Event('change', { bubbles: true })));
+try { await page.waitForFunction('window.__r != null', { timeout: 30000, polling: 500 }); console.log('READY'); }
+catch { console.log('TIMEOUT'); }
+await new Promise((r) => setTimeout(r, 1200));
+await page.screenshot({ path: resolve('ply-test.png') });
+console.log('screenshot -> ply-test.png');
+await browser.close();

apps/viewer-3d/tools/preprocess.mjs

@@ -0,0 +1,192 @@
+#!/usr/bin/env node
+/**
+ * tools/preprocess.mjs — Offline GLB optimization for hmwebviewer.
+ *
+ * SCOPE: GLB/glTF ONLY (gltf-transform pipeline). Other formats shipped as
+ * samples (OBJ/DAE/FBX/IFC) are NOT processed here — they are consumed raw by
+ * their respective three.js loaders; no offline Draco/KTX2 step applies.
+ *
+ * Compresses a glTF/GLB with Draco (geometry) + WebP texture compression in one
+ * pass using gltf-transform. Output is a single self-contained .optimized.glb
+ * ready for the viewer's GLTFLoader (+ DRACOLoader).
+ *
+ * KTX2/Basis texture encoding is NOT done here — it needs the `toktx` platform
+ * encoder (KTX-Software 4.3+). gltf-transform exposes it via the CLI `etc1s`
+ * (lossy, smaller) or `uastc` (higher quality) commands, e.g.:
+ *     gltf-transform etc1s <out.optimized.glb> <out.ktx2.glb>
+ * Install KTX-Software from https://github.com/KhronosGroup/KTX-Software first.
+ * Runtime: the viewer's KTX2Loader decodes these at load (verified with the
+ * Khronos ABeautifulGame KTX2+Draco sample — 626ms perceived load).
+ *
+ * USAGE
+ *   node tools/preprocess.mjs <input.glb> [output.glb] [--draco-bits N] [--texture FMT]
+ *
+ *   --draco-bits N   Position quantization bits (default 14). 8..16; lower=smaller/lossier.
+ *   --texture FMT    Texture re-encode: webp (default) | jpeg | png | none.
+ *
+ * OUTPUT
+ *   Default output = input with `.optimized.glb` suffix. Prints before/after
+ *   byte sizes + reduction %.
+ *
+ * INSTALL (these are devDependencies now; if absent the script prints the
+ * install command and exits non-zero — no silent skip):
+ *   npm install -D @gltf-transform/core @gltf-transform/functions \
+ *                   @gltf-transform/extensions @gltf-transform/cli
+ */
+
+async function loadDeps() {
+  let core, fns, ext;
+  try {
+    core = await import('@gltf-transform/core');
+    fns = await import('@gltf-transform/functions');
+    ext = await import('@gltf-transform/extensions');
+  } catch (e) {
+    const msg = (e && e.message) ? e.message : String(e);
+    console.error('[preprocess] Missing required package: ' + msg);
+    console.error('[preprocess] Install the toolchain with:');
+    console.error(
+      '  npm install -D @gltf-transform/core @gltf-transform/functions ' +
+        '@gltf-transform/extensions @gltf-transform/cli'
+    );
+    process.exit(1);
+  }
+  return { core, fns, ext };
+}
+
+const TEXTURE_FORMATS = ['webp', 'jpeg', 'png', 'none'];
+
+function parseArgs(argv) {
+  const args = argv.slice(2);
+  if (args.length === 0 || args[0] === '-h' || args[0] === '--help') {
+    return { help: true };
+  }
+  const positional = [];
+  let dracoBits = 14;
+  let texture = 'webp';
+  for (let i = 0; i < args.length; i++) {
+    const a = args[i];
+    if (a === '--draco-bits') {
+      const v = Number(args[++i]);
+      if (!Number.isInteger(v) || v < 8 || v > 16) {
+        throw new Error('--draco-bits must be an integer 8..16');
+      }
+      dracoBits = v;
+    } else if (a === '--texture') {
+      const v = String(args[++i]).toLowerCase();
+      if (!TEXTURE_FORMATS.includes(v)) {
+        throw new Error('--texture must be one of: ' + TEXTURE_FORMATS.join(', '));
+      }
+      texture = v;
+    } else if (a.startsWith('--')) {
+      throw new Error('Unknown option: ' + a);
+    } else {
+      positional.push(a);
+    }
+  }
+  if (positional.length === 0) {
+    throw new Error('Missing <input.glb>');
+  }
+  const input = positional[0];
+  let output = positional[1];
+  if (!output) {
+    output = input.replace(/\.glb$/i, '') + '.optimized.glb';
+  }
+  return { input, output, dracoBits, texture };
+}
+
+function usage() {
+  console.error(
+    'Usage: node tools/preprocess.mjs <input.glb> [output.glb] [--draco-bits N] [--texture webp|jpeg|png|none]'
+  );
+}
+
+async function main() {
+  const opts = parseArgs(process.argv);
+  if (opts.help) {
+    usage();
+    return;
+  }
+
+  const { core, fns, ext } = await loadDeps();
+  const { WebIO } = core;
+  const { quantize, dedup, weld, draco, textureCompress, prune } = fns;
+  const { KHRDracoMeshCompression, EXTTextureWebP } = ext;
+
+  const { promises: fs } = await import('node:fs');
+  const path = await import('node:path');
+
+  const inputPath = path.resolve(opts.input);
+  const outputPath = path.resolve(opts.output);
+
+  let inputBytes;
+  try {
+    inputBytes = await fs.readFile(inputPath);
+  } catch (e) {
+    console.error('[preprocess] Cannot read input "' + inputPath + '": ' + e.message);
+    process.exit(1);
+  }
+  const beforeSize = inputBytes.byteLength;
+
+  // Draco encoder must be handed to the extension as a registered dependency.
+  const draco3d = await import('draco3d');
+  const dracoEncoder = await draco3d.createEncoderModule();
+  const io = new WebIO()
+    .registerExtensions([KHRDracoMeshCompression, EXTTextureWebP])
+    .registerDependencies({ 'draco3d.encoder': dracoEncoder });
+
+  let doc;
+  try {
+    doc = await io.readBinary(inputBytes);
+  } catch (e) {
+    console.error('[preprocess] Failed to parse glTF: ' + e.message);
+    process.exit(1);
+  }
+
+  const transforms = [];
+  transforms.push(dedup());
+  transforms.push(weld({ tolerance: 1e-4 }));
+  transforms.push(
+    quantize({
+      quantizePosition: opts.dracoBits,
+      quantizeNormal: 10,
+      quantizeTexcoord: 12,
+      quantizeColor: 8,
+    })
+  );
+  transforms.push(prune());
+  transforms.push(
+    draco({
+      encodeSpeed: 5,
+      decodeSpeed: 5,
+      quantizePosition: opts.dracoBits,
+      quantizeNormal: 10,
+      quantizeTexcoord: 12,
+      quantizeColor: 8,
+    })
+  );
+  if (opts.texture !== 'none') {
+    transforms.push(textureCompress({ targetFormat: opts.texture, quality: 8 }));
+  }
+
+  await doc.transform(...transforms);
+
+  const outGLB = await io.writeBinary(doc);
+  await fs.mkdir(path.dirname(outputPath), { recursive: true });
+  await fs.writeFile(outputPath, outGLB);
+  const afterSize = outGLB.byteLength;
+
+  const reduction = beforeSize > 0 ? ((1 - afterSize / beforeSize) * 100) : 0;
+  const fmt = (n) => (n / 1024).toFixed(1) + ' KiB';
+  console.log('[preprocess] ' + path.basename(inputPath) + ' -> ' + path.basename(outputPath));
+  console.log('[preprocess]   before: ' + beforeSize + ' bytes (' + fmt(beforeSize) + ')');
+  console.log('[preprocess]   after:  ' + afterSize + ' bytes (' + fmt(afterSize) + ')');
+  console.log(
+    '[preprocess]   reduction: ' + reduction.toFixed(1) + '%  ' +
+      '(draco-bits=' + opts.dracoBits + ', texture=' + opts.texture + ')'
+  );
+}
+
+main().catch((e) => {
+  console.error('[preprocess] Fatal: ' + (e && e.stack ? e.stack : e));
+  process.exit(1);
+});

apps/viewer-3d/tools/prerender.mjs

@@ -0,0 +1,138 @@
+#!/usr/bin/env node
+/**
+ * tools/prerender.mjs — 360° turntable pre-render → animated WebP placeholder (PLAN P4-3).
+ *
+ * Loads the running viewer (?model=<asset>) in headless Chrome, orbits the
+ * camera one full turn in N steps, screenshots each frame, then assembles the
+ * PNG sequence into an animated WebP via ffmpeg. The result is an SSR
+ * placeholder image that hydrates into the live canvas on load.
+ *
+ * USAGE
+ *   node tools/prerender.mjs --asset /samples/Duck.glb [--frames 36] [--size 512] \
+ *                           [--framerate 20] [--out public/previews/Duck.webp] \
+ *                           [--url http://127.0.0.1:4173]
+ *
+ * Requires: puppeteer-core (installed) + ffmpeg on PATH + the viewer built & served
+ *           (`npm run build && npm run preview`, or `npm run dev`).
+ */
+import puppeteer from 'puppeteer-core';
+import { existsSync, mkdirSync, rmSync } from 'node:fs';
+import { execFileSync } from 'node:child_process';
+import { dirname, resolve } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const root = resolve(__dirname, '..');
+
+const CHROME_CANDIDATES = [
+  'C:/Program Files/Google/Chrome/Application/chrome.exe',
+  'C:/Program Files (x86)/Google/Chrome/Application/chrome.exe',
+  'C:/Program Files (x86)/Microsoft/Edge/Application/msedge.exe',
+];
+function findBrowser() {
+  if (process.env.PUPPETEER_EXECUTABLE_PATH && existsSync(process.env.PUPPETEER_EXECUTABLE_PATH)) {
+    return process.env.PUPPETEER_EXECUTABLE_PATH;
+  }
+  for (const p of CHROME_CANDIDATES) if (existsSync(p)) return p;
+  return null;
+}
+
+function parseArgs(argv) {
+  const a = argv.slice(2);
+  const o = { asset: null, frames: 36, size: 512, framerate: 20, out: null, url: 'http://127.0.0.1:4173' };
+  for (let i = 0; i < a.length; i++) {
+    const k = a[i], v = a[i + 1];
+    if (k === '--asset') { o.asset = v; i++; }
+    else if (k === '--frames') { o.frames = parseInt(v, 10); i++; }
+    else if (k === '--size') { o.size = parseInt(v, 10); i++; }
+    else if (k === '--framerate') { o.framerate = parseInt(v, 10); i++; }
+    else if (k === '--out') { o.out = v; i++; }
+    else if (k === '--url') { o.url = v; i++; }
+    else if (k === '-h' || k === '--help') return { help: true };
+  }
+  if (!o.asset) return { help: true };
+  if (!o.out) {
+    const base = o.asset.split('/').pop().replace(/\.(glb|gltf|obj|fbx|dae|ifc)$/i, '');
+    o.out = 'public/previews/' + base + '.webp';
+  }
+  // Undo MSYS/Git-Bash mangling of leading-slash args (/samples/x.glb -> C:/.../Git/samples/x.glb)
+  o.asset = o.asset.replace(/^.*\/Program Files\/Git\//i, '/');
+  if (!o.asset.startsWith('/')) o.asset = '/' + o.asset;
+  return o;
+}
+
+function ffmpegAvailable() {
+  try { execFileSync('ffmpeg', ['-version'], { stdio: 'ignore' }); return true; }
+  catch { return false; }
+}
+
+async function main() {
+  const opts = parseArgs(process.argv);
+  if (opts.help) {
+    console.error('Usage: node tools/prerender.mjs --asset /samples/Duck.glb [--frames 36] [--size 512] [--framerate 20] [--out public/previews/Duck.webp] [--url URL]');
+    process.exit(opts.asset ? 0 : 1);
+  }
+
+  const exe = findBrowser();
+  if (!exe) { console.error('[prerender] No Chrome/Edge found.'); process.exit(1); }
+  const haveFfmpeg = ffmpegAvailable();
+
+  const baseName = opts.asset.split('/').pop().replace(/\.(glb|gltf|obj|fbx|dae|ifc)$/i, '');
+  const frameDir = resolve(root, '.prerender-frames', baseName);
+  rmSync(frameDir, { recursive: true, force: true });
+  mkdirSync(frameDir, { recursive: true });
+
+  const browser = await puppeteer.launch({
+    executablePath: exe,
+    headless: 'new',
+    args: ['--no-sandbox', '--use-gl=swiftshader', '--enable-webgl', '--ignore-gpu-blocklist'],
+    defaultViewport: { width: opts.size, height: opts.size },
+  });
+  const page = await browser.newPage();
+  page.on('console', (m) => { if (m.type() === 'error') console.error('[page-console]', m.text()); });
+  page.on('pageerror', (e) => console.error('[page-error]', e.message));
+  page.on('requestfailed', (r) => console.error('[req-failed]', r.url(), r.failure()?.errorText));
+  await page.evaluateOnNewDocument(() => {
+    window.__hmwReady = null;
+    window.addEventListener('hmw:ready', (e) => { window.__hmwReady = e.detail; });
+  });
+  await page.goto(opts.url + '?model=' + opts.asset, { waitUntil: 'domcontentloaded', timeout: 30000 });
+  await page.waitForFunction('window.__hmwReady != null', { timeout: 30000 });
+
+  for (let i = 0; i < opts.frames; i++) {
+    const azimuth = (i / opts.frames) * Math.PI * 2;
+    await page.evaluate((az) => window.__viewer && window.__viewer.rotateTo(az), azimuth);
+    const file = resolve(frameDir, 'frame_' + String(i).padStart(3, '0') + '.png');
+    await page.screenshot({ path: file, omitBackground: false });
+  }
+  await browser.close();
+  const { readdirSync } = await import('node:fs');
+  const frameCount = readdirSync(frameDir).filter((f) => f.endsWith('.png')).length;
+  console.log('[prerender] captured ' + frameCount + '/' + opts.frames + ' frames -> ' + frameDir);
+
+  const outAbs = resolve(root, opts.out);
+  mkdirSync(dirname(outAbs), { recursive: true });
+
+  if (!haveFfmpeg) {
+    console.warn('[prerender] ffmpeg not found. Frames left in ' + frameDir);
+    console.warn('[prerender] assemble manually:');
+    console.warn('  ffmpeg -framerate ' + opts.framerate + ' -i ' + frameDir + '/frame_%03d.png -loop 0 ' + outAbs);
+    return;
+  }
+  // Assemble animated WebP. NOTE: libwebp_anim is broken in this ffmpeg build
+  // (outputs 1 frame); -c:v libwebp + -vsync vfr produces correct multi-frame WebP.
+  execFileSync('ffmpeg', [
+    '-y', '-framerate', String(opts.framerate), '-vsync', 'vfr',
+    '-i', resolve(frameDir, 'frame_%03d.png'),
+    '-vf', 'scale=' + opts.size + ':' + opts.size + ':flags=lanczos',
+    '-c:v', 'libwebp', '-loop', '0', '-lossless', '0', '-q:v', '70',
+    outAbs,
+  ], { stdio: 'inherit' });
+  console.log('[prerender] animated WebP -> ' + opts.out);
+  rmSync(frameDir, { recursive: true, force: true });
+}
+
+main().catch((e) => {
+  console.error('[prerender] Fatal: ' + (e && e.stack ? e.stack : e));
+  process.exit(1);
+});

apps/viewer-3d/tools/tex-test.mjs

@@ -0,0 +1,106 @@
+#!/usr/bin/env node
+/**
+ * Generate a textured cube (cube.obj + cube.mtl + checker.png), then load it
+ * through the real drag&drop path (uploadFile of all 3) in headless Chrome and
+ * screenshot — verifies OBJ texture support (map_Kd → dropped image blob URL).
+ *
+ * USAGE: node tools/tex-test.mjs [--url http://localhost:3333]
+ */
+import puppeteer from 'puppeteer-core';
+import { existsSync, mkdirSync, writeFileSync } from 'node:fs';
+import { deflateSync } from 'node:zlib';
+import { resolve } from 'node:path';
+
+// ---- minimal PNG encoder (truecolor RGB, filter 0) ----
+const CRC = (() => {
+  const t = new Uint32Array(256);
+  for (let n = 0; n < 256; n++) { let c = n; for (let k = 0; k < 8; k++) c = c & 1 ? 0xedb88320 ^ (c >>> 1) : c >>> 1; t[n] = c >>> 0; }
+  return (buf) => { let c = 0xffffffff; for (let i = 0; i < buf.length; i++) c = t[(c ^ buf[i]) & 0xff] ^ (c >>> 8); return (c ^ 0xffffffff) >>> 0; };
+})();
+function chunk(type, data) {
+  const len = Buffer.alloc(4); len.writeUInt32BE(data.length, 0);
+  const td = Buffer.concat([Buffer.from(type, 'ascii'), data]);
+  const crc = Buffer.alloc(4); crc.writeUInt32BE(CRC(td), 0);
+  return Buffer.concat([len, td, crc]);
+}
+function checkerPng(size = 64, cell = 8) {
+  const raw = Buffer.alloc((size * 3 + 1) * size);
+  for (let y = 0; y < size; y++) {
+    let o = y * (size * 3 + 1); raw[o++] = 0; // filter byte
+    for (let x = 0; x < size; x++) {
+      const on = ((x / cell | 0) + (y / cell | 0)) & 1;
+      raw[o++] = on ? 255 : 0; raw[o++] = on ? 0 : 255; raw[o++] = 255; // magenta / cyan
+    }
+  }
+  const ihdr = Buffer.alloc(13);
+  ihdr.writeUInt32BE(size, 0); ihdr.writeUInt32BE(size, 4);
+  ihdr[8] = 8; ihdr[9] = 2; // bitdepth 8, colortype 2 (RGB)
+  const sig = Buffer.from([137, 80, 78, 71, 13, 10, 26, 10]);
+  return Buffer.concat([sig, chunk('IHDR', ihdr), chunk('IDAT', deflateSync(raw)), chunk('IEND', Buffer.alloc(0))]);
+}
+
+const OBJ = `mtllib cube.mtl
+v -1 -1 -1
+v 1 -1 -1
+v 1 1 -1
+v -1 1 -1
+v -1 -1 1
+v 1 -1 1
+v 1 1 1
+v -1 1 1
+vt 0 0
+vt 1 0
+vt 1 1
+vt 0 1
+usemtl checker
+f 1/1 2/2 3/3
+f 1/1 3/3 4/4
+f 5/1 6/2 7/3
+f 5/1 7/3 8/4
+f 1/1 5/2 8/3
+f 1/1 8/3 4/4
+f 2/1 6/2 7/3
+f 2/1 7/3 3/4
+f 4/1 3/2 7/3
+f 4/1 7/3 8/4
+f 1/1 2/2 6/3
+f 1/1 6/3 5/4
+`;
+const MTL = `newmtl checker
+Kd 1 1 1
+map_Kd checker.png
+`;
+
+const dir = resolve('samples/textest');
+mkdirSync(dir, { recursive: true });
+writeFileSync(resolve(dir, 'cube.obj'), OBJ);
+writeFileSync(resolve(dir, 'cube.mtl'), MTL);
+writeFileSync(resolve(dir, 'checker.png'), checkerPng());
+console.log('assets ->', dir);
+
+const url = process.argv.includes('--url') ? process.argv[process.argv.indexOf('--url') + 1] : 'http://localhost:3333';
+const CHROME = [
+  'C:/Program Files/Google/Chrome/Application/chrome.exe',
+  'C:/Program Files (x86)/Microsoft/Edge/Application/msedge.exe',
+].find((p) => existsSync(p));
+
+const browser = await puppeteer.launch({
+  executablePath: CHROME, headless: 'new',
+  args: ['--no-sandbox', '--use-gl=swiftshader', '--enable-webgl', '--ignore-gpu-blocklist', '--window-size=900,700'],
+});
+const page = await browser.newPage();
+await page.setViewport({ width: 900, height: 700 });
+page.on('console', (m) => console.log('  [browser]', m.text()));
+page.on('pageerror', (e) => console.log('  [pageerror]', e.message));
+await page.evaluateOnNewDocument(() => { window.__r = null; addEventListener('hmw:ready', (e) => { window.__r = e.detail; }); });
+await page.goto(url, { waitUntil: 'domcontentloaded', timeout: 30000 });
+await page.waitForSelector('#file-input');
+const input = await page.$('#file-input');
+await input.uploadFile(resolve(dir, 'cube.obj'), resolve(dir, 'cube.mtl'), resolve(dir, 'checker.png'));
+await page.evaluate(() => document.getElementById('file-input').dispatchEvent(new Event('change', { bubbles: true })));
+try { await page.waitForFunction('window.__r != null', { timeout: 30000, polling: 500 }); console.log('READY'); }
+catch { console.log('TIMEOUT'); }
+await new Promise((r) => setTimeout(r, 1500));
+await page.screenshot({ path: resolve('tex-test.png') });
+console.log('screenshot -> tex-test.png');
+await browser.close();

apps/viewer-3d/tsconfig.json

@@ -0,0 +1,20 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "useDefineForClassFields": true,
+    "module": "ESNext",
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
+    "skipLibCheck": true,
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "noEmit": true,
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true,
+    "types": ["three", "vite/client"]
+  },
+  "include": ["src", "tools"]
+}

apps/viewer-3d/vite.config.ts

@@ -0,0 +1,16 @@
+import { defineConfig } from 'vite';
+
+export default defineConfig({
+  server: { host: '127.0.0.1', port: 3333, open: false, strictPort: true },
+  build: {
+    target: 'es2022',
+    sourcemap: false,
+    rollupOptions: {
+      output: {
+        manualChunks(id) {
+          if (id.includes('/node_modules/three/')) return 'three';
+        },
+      },
+    },
+  },
+});

dist2/assets/acadrustParser-BLUkSD4E.js

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dist2/assets/acadrustParser-CJeZuNZe.js

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