workinf_Blender_Wasm/docs/status/W-073.md

W-073 Status

status: in_progress
task: 定义 Blender 三角面简化和 LOD 协议

web/protocol/simplify.ts now defines versioned SimplifyProfile, SimplifyResult and LODManifest contracts. The profile validator keeps the Blender modifier modes separate:

• COLLAPSE requires ratio in (0, 1] and supports triangle budget, vertex-group weighting/inversion, triangulate, symmetry axis and tolerance.
• UNSUBDIV requires a positive integer iterations and rejects collapse or dissolve-only parameters.
• DISSOLVE_PLANAR requires angleLimit in [0, PI], with explicit boundary delimit flags and dissolve-boundary handling.

The parser also enforces non-negative source revisions and error codes for missing vertex groups, unsupported cross-mode fields, invalid budgets and LOD manifests whose triangle budgets do not decrease. A browser E2E test covers a valid collapse profile, a two-level manifest and the missing-vertex-group failure.

The common profile now carries an explicit attributePolicy (PRESERVE/RECOMPUTE_NORMALS/DROP) and a validated SkinSimplifyPolicy with maximum influences, minimum weight, maximum position error and shape-key handling. Vertex-group and symmetry-only fields are conditionally optional, so the TypeScript contract and runtime validator no longer disagree when those features are disabled.

The protocol is now exercised end-to-end by the native/WASM command path: decimateMesh validates sourceMeshRevision, returns a new SceneIR revision, and the browser-facing smoke checks topology counts, index bounds and attribute buffer lengths. Native Blender/WASM golden parity for all parameter combinations remains part of W-079; implementation of the declared skin policy remains W-076.