I keep messing with this but I can''t get it right. If I want to transform an object about it''s local coord. by rx, ry, and rz how do I set up the world matrix for g_pd3dDevice->SetTransform(D3DTS_WORLD, &matWorld); I tried creating a matX, matY, matZ and then doing a matWorld = matY * mat_x * matZ; but it doesn''t come out right. It always ends up rotating incorrectly.