Hi - quick topic (I hope): I am refactoring my C++ directx9 game that makes use of an ID3DXMatrixStack in its scene node tree rendering traversal. I am trying to eliminate all references to the old D3DXMath library replacing all with XNA Math/DirectXMath to use SSE. Firstly: is there an equivalent XNA Math Matrix Math structure? - there doesn't appear to be so, so failing that would you give some suggestions for replacement implementation - and what might be normal? From what I see any solution seems to require an aligned XMMATRIX structure member... if I am to pick-up the SSE performance gain. Thanks vm.