Gets a vector.
HRESULT GetVector( D3DXHANDLE hParameter, 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 larger than the source vector, only the initial components of the destination vector will be filled, and the remaining components will be set to zero.
Header: Declared in D3dx9shader.h.