GetTransform() costly?

DarkZoulz · 2006-03-25T00:08:19+00:00

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?

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.

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