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|shapeName||Name of the blend shape to add a frame to.|
|frameWeight||Weight for the frame being added.|
|deltaVertices||Delta vertices for the frame being added.|
|deltaNormals||Delta normals for the frame being added.|
|deltaTangents||Delta tangents for the frame being added.|
Adds a new blend shape frame.
If blend shape name does not exist, then a new blend shape is created. Blend shape frames can only be added to a new bland shape, or the last blend shape. Usually there will be a single frame for a blend shape, but the range of blending [0-100%] may be split into multiple frames. Weight is assumed to be 100% when a shape only has one frame. Frame must be added in an increasing weight order for blend shapes having multiple frames.
deltaTangents arrays must be of size = Mesh.vertexCount. Substract Mesh vertices, normals or tangents to convert from frame full vectors to get deltas.
deltaTangents may be set to null if there are no normals or tangents for a frame.
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