|Microsoft DirectX 9.0|
Unlock the vertex buffer.
If the method succeeds, the return value is D3D_OK.
If the method fails, the return value can be one of the following values.
D3DERR_INVALIDCALL The method call is invalid. For example, a method's parameter may have an invalid value. E_OUTOFMEMORY Microsoft?Direct3D?could not allocate sufficient memory to complete the call.
The vertex buffer is usually locked, written to, and then unlocked for reading.