Sets a vector.
HRESULT SetVector( D3DXHANDLE hParameter, CONST D3DXVECTOR4* pVector );
If the method succeeds, the return value is D3D_OK. If the method fails, the return value can be D3DERR_INVALIDCALL.
If the destination vector is smaller than the source vector, the additional components of the source vector will be ignored.
Header: Declared in D3dx9shader.h.