Unlocks a rectangle on a cube texture resource.
HRESULT UnlockRect( D3DCUBEMAP_FACES FaceType, UINT Level );
If the method succeeds, the return value is D3D_OK. If the method fails, the return value can be: D3DERR_INVALIDCALL.
Header: Declared in D3d9.h.
IDirect3DCubeTexture9::AddDirtyRect, IDirect3DCubeTexture9::LockRect