[osg-users] performance issues with RTT

Fabian Bützow buetz at uni-koblenz.de
Mon Sep 8 03:12:23 PDT 2008


im also working on RTT prerender stuff,
and i experienced the same FRAME_BUFFER_OBJECT-slow-down-the system as 
Im also running a windows system.

However, my goals a slightly different from yours, but i am suffering 
from low frame rates as well. I want to do image pre-processing of a 
live camera image. The camera img is attached to a screen filling 
rectangle and rendered with a fragment shader. The output texture is 
input of the next RTT step.

I'm wondering if the low framerates are caused by insufficient hardware, 
programming mistakes or osg itself ;)

There are 6 RTT steps (640x480), each with 9 texture look-ups a fragment 
(filter mask) and very simple noise processing. I'm running an Opteron 
2,21 Ghz, 1GB RAM, Geforce 8400 GS. I achieve (incl camera image 
grabbing) <8fps.

Do you think this is ok, or should the system be working faster?


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