EarendelArc 8ef1461cb8 glTF2: Preserve interpolation type and CubicSpline tangent data in animation keys (#6543) ...

fix(gltf2): preserve interpolation type and CubicSpline tangents

The glTF2 importer previously ignored the mInterpolation field and discarded
CubicSpline tangent data, leading to incorrect animation playback.

- Implement MapInterpolation() to map glTF2 interpolation types to Assimp.
- Set mInterpolation for all aiVectorKey and aiQuatKey instances.
- For CUBICSPLINE samplers, store [in-tangent, value, out-tangent] triplets
  (N x 3 keys) instead of discarding tangents.
- Fixes rendering consistency for InterpolationTest.glb where STEP, LINEAR,
  and CUBICSPLINE rows previously rendered identically.

Affected channels: mPositionKeys, mRotationKeys, mScalingKeys.

Co-authored-by: Kim Kulling <kimkulling@users.noreply.github.com>

2026-02-26 15:33:03 +01:00

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