Rendering 2 copies of scene

Pawel Hernik (pawel++at++beskid0.ai.com.pl)
Thu, 8 May 1997 11:19:17 GMT

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We have following problem:
Our VisSim application must render 2 exact copy of scene. On second screen
only overlay buffer changes. Our system: OnyxRE2, 2RM, 4CPU, 2++at++1280x1024. How todo it fast? We tried to copy all rendered screen space from one place in
framebuffer to another but it is very slow (via rectcopy), probably slower than
render scene once again but without culling and geometry calculations. How to
do it in Performer? I mean rendering the same scene 2 times in different places
in framebuffer (for 2 screens) but without double culling?
How does exactly work rectcopy (or glCopyPixels)? Does it copy only within
framebuffer or use temporary host memory? If only RM memory is copied
why it is as slow :(

Thanx in advance,
Pawel

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