Adds a matrix to the stack.
HRESULT Push();
None.
If the method succeeds, the return value is D3D_OK. If the method fails, the return value can be D3DERR_INVALIDCALL.
This method increments the count of items on the stack by 1, duplicating the current matrix. The stack will grow dynamically as more items are added.
Header: Declared in D3dx9math.h.