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perf: reduce 3D runtime artifacts (#7)

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lectom
2026-07-29 11:04:42 +09:00
parent fc2871ce4c
commit 0c656808e0
20 changed files with 148 additions and 309 deletions
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apps/viewer-3d/CLAUDE.md
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@@ -25,7 +25,7 @@ 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**: CDN by default; copy WASM to `public/draco` + `public/basis` if offline/CSP required. Pin decoder version to the three.js version in use.
- **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.