Implement GLTFCubicSplineInterpolant #936
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Korijn
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This PR implements the CubicSpline interpolation algorithm as specified in the glTF standard.
Additional Notes:
In glTF, unlike other animation track data, for animation tracks using CUBICSPLINE interpolation, each input element corresponds to three output elements: an in-tangent, a spline vertex, and an out-tangent.
ref: https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#interpolation-cubic
You can view the InterpolationTest use case in the
gltf_viewer.pyexample.