HRESULT AddVertex(D3DVALUE x, D3DVALUE y, D3DVALUE z);
Adds a vertex to a Direct3DRMFace object.
·Returns D3DRM_OK if successful, or an error otherwise. For a list of possible return codes, see Direct3D Retained-Mode Return Values.
x, y, and z
The x, y, and z components of the position of the new vertex.