Method Interpolate

trinity/Curves/Tr2BoneMatrixCurve.cpp:123–152

-------------------------------------------------------------------------------------- Description: Supposedly interpolates between two keys. This function doesn't actually do that, though. If there is no skinned object or bone, it returns the identity matrix. If there is a skinned object, this multiplies the bone transform for the cached joint by the skinned object's world transform. Arguments:

//   The matrix result of the 'interpolation'
// --------------------------------------------------------------------------------------
Matrix* Tr2BoneMatrixCurve::Interpolate( Matrix* out, Tr2MatrixKey* /*startKey*/, Tr2MatrixKey* /*endKey*/ )
{
	if( !m_skinnedObject || m_bone.empty() )
	{
		*out = XMMatrixIdentity();
		return out;
	}

	if( m_skeletonTag != m_skinnedObject->GetSkeletonTag() )
	{
		m_cachedJoint = m_skinnedObject->GetBoneIndex( m_bone );
		if( m_cachedJoint != ~0u )
		{
			m_skeletonTag = m_skinnedObject->GetSkeletonTag();
		}
	}

	const Matrix* m = m_skinnedObject->GetBoneTransform( m_cachedJoint );
	if( m )
	{
		// We've got the bone in local space, now we need to multiply it
		// by our skinned object's world transform.
		*out = XMMatrixMultiply( XMMatrixMultiply( m_transform, *m ), m_skinnedObject->GetTransform() );
	}
	else
	{
		*out = XMMatrixIdentity();
	}
	return out;
}