#blender

The division of labor for authoring s&box animation with agents: the owner authors hero poses in the Animate studio, agents build the motion around them against a numeric definition of done, and the owner taste-gates frames, never live sessions. Covers the pose-to-pose synthesis pattern, numeric acceptance, and the sequence-time traps that break freeze-at-end logic.

Two-stage flow: Blender headless emits Y-up OBJ, then pure Python writes vmats/vmdls and a C# model catalog.

bpy.ops.wm.obj_export can reorder face lines across runs on the same mesh: diff the manifest, not the raw OBJ bytes.

Census tris × instances first: silhouette fails before UVs; inject usemtl after scripted OBJ export.

Forge delivery job errors out but the build stage's previewGlbUrl stays downloadable: recover the GLB through Blender into your standard delivery shape instead of re-spending.

CC0 kits import like any OBJ+vmdl; city kits share colormap.png, nature kits need per-color vmats, and facing is a per-model yaw guess.

Blender +X becomes world −Y after OBJ import; yaw +90° faces +X, and Blender +Y rotation tips the +X edge down.

Transfer rest-delta rotations parent-relative (not world): avoid the forward-hunch bug and never transform_apply scale on Mixamo armatures.

Bone-heat auto-weights fail on AI meshes. Use scripted geodesic (along-surface) weights, then FBX + animated vmdl.

Scenes never load raw OBJ/GLB: always wrap with a .vmdl and remap materials under both bare and .vmat names.

Default −Z/Y axes, bake_space_transform, no leaf bones, X/Z bone axes, mesh FBX + per-clip armature FBX; scale via ScaleAndMirror 0.3937.