GetTransform() costly?

Graphics and GPU Programming Programming

Started by DarkZoulz March 25, 2006 12:08 AM

0 comments, last by circlesoft 18 years, 1 month ago

106

Author

March 25, 2006 12:08 AM

Is it a heavy operation to get and set transformation matrices in D3D? I mean, can I throughout the engine use a device->GetTransform(D3DTS_WORLD, &matrix) to retrieve the world transform, or should I store it locally and get that copy every time I need it?

circlesoft

1,178

March 25, 2006 01:27 AM

SetTransform() is pretty costly, as this entails a state change - GetTransform(), not so much. Remember that if you have a pure device, you can't use most IDirect3DDevice::Get*() calls. Generally, it is more flexible (and better design) to store the transforms yourself. Otherwise, you could be calling GetTransform() multiple times per frame, ect.