Models, glTF & 3D
Evidence basis: source-verified at the pinned commit. Claims on this page were checked by reading the CNA source at commit 3b43bd86; unless a sentence says otherwise, nothing here was built or executed.
Model and mesh runtime types, glTF import, GPU vertex packing, skinning and animation, the CNJ model toolchain and glTF conformance evidence.
Pages in this group
- Model, ModelMesh and ModelMeshPart: the runtime graph and its draw contract — What Model::Draw and ModelMesh::Draw do, the invariants a loaded graph supplies, what copies share, the five model content routes and the collection rules, at this snapshot.
- The glTF import core: parser boundary, scene graph and extraction — How CNA's shared glTF import core parses, validates, flattens the scene, groups meshes, extracts materials and reports losses, and what its runtime and offline front ends share.
- Vertex packing: the glTF stride ABI, index widths and topology — The eleven canonical vertex strides, how a glTF primitive's layout is chosen, typed versus raw upload, index narrowing, the seven topologies, tangents, mirroring and the hard limits the bytes impose.
- Skinning, animation and morph targets on a Model — SkinningData and AnimationPlayer semantics, the three glTF skin index spaces, the D8 root prefix, clip resampling, rigid scene-node clips and CPU morph blending, at this snapshot.
- The CNJ model toolchain: gltf_to_cnj, the Model envelope and sidecars — What cna_tool_gltf_to_cnj writes, the per-type version-2 Model envelope, which descriptor and sidecar rules the .cnj reader enforces or trusts, route parity and the dual-texture occlusion remap.
- glTF conformance: corpus, oracle ladder and evidence — The pinned glTF specification, the 148-asset generated corpus, the L0-L7 oracle ladder, renderer-owned pixel campaigns, the Khronos comparisons, the defect ledger and the milestone statuses.