//ToDo : учет associate model?
// GlobalTransform of the bone at the binding moment.
//
// (Comments from fbxcluster.h)
// Transformation matrices. A link has three transformation matrices:
// - Transform refers to the global initial transform of the geometry node(geometry is the attribute of the node) that contains the link node.
// - TransformLink refers to global initial transform of the link(bone) node.
// - TransformAssociateModel refers to the global initial transform of the associate model.
//
// For example, given a mesh binding with several bones(links), Transform is the global transform
// of the mesh at the binding moment, TransformLink is the global transform of the bone(link)
// at the binding moment, TransformAssociateModel is the global transform of the associate model
// at the binding moment.
FbxAMatrix GetInitialTransform()
{
if (cluster == null)
{
return(FbxMath.EvaluateGlobalTransform(Node));
}
//Each cluster is associated with a FbxNode (bone)
//cluster.GetLink().GetUniqueID() == Node.GetUniqueID();
//??? Учитывать ли AxisSystem?
//??? Не совсем понятны отличаи globalMeshTransform == skin.GetGeometry().GetNode().EvaluateGlobalTransform(), от cluster.GetTransformMatrix()
//matrix associated with the geometry node containing the link. (global transform of the mesh at the binding moment)
FbxAMatrix globalMeshInitialTransform = new FbxAMatrix();
cluster.GetTransformMatrix(globalMeshInitialTransform);
//Get matrix associated with the link node (bind pose, bone transform) at the binding moment
FbxAMatrix boneInitialTransform = new FbxAMatrix();
cluster.GetTransformLinkMatrix(boneInitialTransform);
//Дополнительная матрица которую cluster ассоциирует с Node - Трансформация в момент привязки.
//bind pose matrix that is local for the mesh = Inverse(TransformMatrix) * TransformLinkMatrix
FbxAMatrix localBindPose = (globalMeshInitialTransform.mul(geometryOffset).Inverse()).mul(boneInitialTransform);
//globalMeshTransform * Inverse(globalMeshInitialTransform) * boneInitialTransform
return(globalMeshTransform.mul(geometryOffset).mul(localBindPose));
}
