Some useful patterns

VOID SetMouseCursor(DWORD pClient, D3DXVECTOR3 *Position)
{
	D3DXMATRIX View, iView;
	D3DXVECTOR3 Distance;

	pDevice->GetTransform(D3DTS_VIEW, &View);

	D3DXMatrixInverse(&iView, NULL, &View);
	D3DXVec3Subtract(&Distance, Position, &D3DXVECTOR3(iView._41, iView._42, iView._43));


	*(FLOAT *)(pClient + Offset_Yaw) = (FLOAT)atan2(-Distance.y, sqrt(Distance.x * Distance.x + Distance.z * Distance.z));
	*(FLOAT *)(pClient + Offset_Pitch) = (FLOAT)atan2(Distance.x, Distance.z);
}