Loads the given matrix into the current matrix.
HRESULT LoadMatrix( CONST D3DXMATRIX * pMat );
If the method succeeds, the return value is D3D_OK. If the method fails, the return value can be D3DERR_INVALIDCALL.
Note that this method does not add an item to the stack; rather, it replaces the current matrix with the supplied matrix.
Header: Declared in D3dx9math.h.