Unlock the index buffer.
HRESULT UnlockIndexBuffer();
None.
If the method succeeds, the return value is D3D_OK. If the method fails, the return value can be one of the following: D3DERR_INVALIDCALL, E_OUTOFMEMORY.
The index buffer is usually locked, written to, and then unlocked for reading.
Header: Declared in D3dx9mesh.h.