38 lines
2.1 KiB
Markdown
38 lines
2.1 KiB
Markdown
# W-074 Status
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status: in_progress
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task: 编译并复用 Blender Decimate 实现
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`web_engine_decimate.cpp` now wraps Blender's native BMesh decimate entry points
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(`BM_mesh_decimate_collapse`, `BM_mesh_decimate_unsubdivide` and
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`BM_mesh_decimate_dissolve`) behind the local `web_engine_decimate_apply`
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two-pass C ABI. The wrapper accepts triangle buffers, returns required output
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capacities on the first call, and leaves the input mesh untouched.
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`web_engine_apply_command` now accepts `decimateMesh` with a versioned
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`SimplifyProfile`, validates the source revision, calls the native wrapper, and
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replaces the evaluated SceneIR mesh topology. The command allocates output from
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the input upper bounds and evaluates Decimate once; it does not run the
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modifier twice merely to query exact capacities. Normals are recomputed from
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the result, BMFace material indices are retained, and UV/float-color corners
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are transferred by the W-076 policy layer. Collapse now accepts boundary and
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non-manifold triangle meshes through the same BMesh bridge. The blend reader
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reconstructs corner vertices from `.corner_edge` and `.edge_verts` only after
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validating every face cycle, so it never treats edge indices as vertex indices.
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`npm run test:topology-collapse` independently opens and collapses an open quad,
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an open n-gon and a three-face shared-edge mesh; malformed cycles remain
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`summary-only`.
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The WebEngine CMake target exports the ABI symbol and links a small archive-file
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group containing Blender BMesh, CustomData-capable BKernel objects, DNA/BLO,
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local zlib/zstd and allocator support; this avoids pulling the desktop
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editor/image dependency graph into the WASM module.
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The local artifact is installed in both `web/app/public/vendor/blender/` and
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`web/app/src/vendor/blender/`, with the manifest SHA-256 updated. The native
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smoke covers all three modes, Collapse topology reduction, revision sequencing,
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SceneDelta and normal/UV/material attribute lengths. The browser regression
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suite covers the same local WASM command path, including native command,
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preview and isolated LOD workers. Modifier-stack transactions and full
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skin/seam/sharp preservation remain W-075/W-076.
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