Use first offsetMatrix for a bone (there may be multiple) and calculate using offsetOfParent * inverseRootOffset * rootOffset * inverseOffset
(cherry picked from commit a8eae976dda39ad28f9aa235e1e6ba34715ac48a)
# Conflicts:
# Code/Tools/SceneAPI/FbxSceneBuilder/Importers/AssImpTransformImporter.cpp
For bone nodes, the Transform is computed by multiplying the parent offsetMatrix by the inverse of the node's offsetMatrix
Note that this currently disables the LimitBoneWeights option since that results in the removal of bone nodes that are not attached to a mesh.
Without the bones there is no way to retrieve the offsetMatrix, so the Transform cannot be computed correctly
Fixes LYN-3755
* Helios - LYN-3250 - Fixed morph targets for meshes that had multiple materials (#374)
Fixed morph targets for meshes that had multiple materials and were split by AssImp: Recombined them into one mesh in the O3DE scene graph, so the behavior would match FBX SDK.
amzn-mike
Steve Pham
AMZN-stankowi
alexpete