alphafetusandClaude Sonnet 5
9a93c0d189
Meshes now track per-primitive submesh ranges (index range + source material index) instead of one flat index range each. glTF meshes get one submesh per primitive; OBJ meshes get a single default submesh until .mtl loading exists. MeshRegistry rewrites these into offsets into its shared index buffer, and the renderer issues one draw call per submesh so each can later be bound to its own material. Also fixes app.rs to match the current MeshRegistry API (load_scene instead of the removed from_scene, and Option-wrapped buffers). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01986QNHM1cUsnRskKvBbbuo