kimminsungandClaude Opus 4.8
a71790070d
Three.js viewer supporting glb/gltf/obj/fbx/dae/ifc/ply via both server (SSR) and drag&drop (CSR) paths. - Streaming OBJ parser (src/viewer/objStream.ts) for files past the V8 max string length (>~1GB text) that OBJLoader can't handle; indexed geometry, per-vertex color from MTL Kd, float64 recenter baked in. - In-viewer float64 recenter (objRecenter.ts) for huge CAD/survey coordinates (~1e8) so float32 vertex buffers keep precision (no cracked faces). - Z-up right-handed world; Y-up formats rotated on load. - OBJ+MTL+texture drag&drop (LoadingManager URL-modifier maps dropped images). - OrbitControls ground-plane panning (road/rail alignment workflow). - UI: Zoom Fit, perspective/orthographic toggle, feature-edge outline. - DoubleSide for CAD OBJ; PLY mesh + point-cloud support. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
77 lines
3.0 KiB
Markdown
77 lines
3.0 KiB
Markdown
# 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.
|