# WBV2-P3-004 status

- task: `WBV2-P3-004`
- parent: `WBV2-P3-003`
- parity: `IO.GLB_ROUNDTRIP`
- implementationClass: `LOCAL_EXACT`
- status: `done`
- fixture: `tests/files/web/generated/WBV2-P3-004-IO.GLB_ROUNDTRIP.blend`

## Evidence

- Blender desktop and WASM/Main expose the same bounded GLB roundtrip graph: one mesh with 8 vertices, 12 triangles, one UV layer, one morph target, one two-bone skin, one packed image, and one animation.
- Export/import preserves mesh, skin, morph, image, and animation semantics exactly; the emitted GLB is 7,540 bytes with `glTF` magic.
- Malformed GLB, external image URI, and over-budget input are rejected by the bounded importer. Blender save/reopen remains exact.

## Commands

- `build_blender_5.2.0/bin/blender -b --factory-startup --python tools/web/generated/WBV2-P3-004.py -- tests/files/web/generated/WBV2-P3-004-IO.GLB_ROUNDTRIP.blend`
- `build_blender_5.2.0/bin/blender -b --factory-startup --python tools/web/check-wbv2-p3-004-desktop.py -- tests/files/web/generated/WBV2-P3-004-IO.GLB_ROUNDTRIP.blend tests/golden/WBV2-P3-004/glb-desktop-report.json`
- `node --check tools/web/check-generated-gap.mjs`
- `npm --prefix web run test:generated-gap -- --task WBV2-P3-004`
- `node tools/web/check-generated-gap.mjs --task WBV2-P3-004`
- `node tools/web/check-task-context.mjs --task WBV2-P3-004 --write`

## Handoff

- nextTask: `WBV2-P3-005`
- queue mutation: allowed after manifest and parent hash validation