# W1 web viewer report

Implemented in `Standalone/Tools/webviewer/`: a localhost-only Python server, a standard-library VFMSH001/002 to GLB converter, a pinned Three.js viewer with desktop/touch flight, speed, lighting/fog, wireframe/normal colours, stats, mesh selection, and A/B switching. See the tool README for commands and use limits.

Converted three existing meshes (source bytes → GLB bytes; conversion time):

| Mesh | Bytes | Convert | Warm local read (5 reads, mean) |
|---|---:|---:|---:|
| `capture-sw-far-v20-settled-surface` | 62,304 → 63,548 | 1.995 ms | 0.010 ms |
| `fi-floor-v20-lod4-focus` | 113,076 → 109,612 | 4.061 ms | 0.015 ms |
| `capture-fi-mouth` | 63,932 → 62,100 | 2.102 ms | 0.017 ms |

Verified: all three GLB v2 headers/chunks, JSON, vertex/normal/index buffer lengths, finite vertex data, in-range indices, and expected tile/triangle metadata; Node syntax check passed for the inline viewer module. The local read timings are warm filesystem reads, not browser decode or network timings.

Not verified: server startup and visual mesh loading in a browser. Starting `server.py --port 18765` reached socket bind and failed with `PermissionError: [Errno 1] Operation not permitted` in this execution sandbox; the attempt is logged in `Saved/Linux/w1/webviewer-server.log`. No headless browser was found. Thus GLB structure is validated, but visual rendering and in-browser load timing still need a run outside this sandbox. The server code binds explicitly to `127.0.0.1` and has no host override.