Hello Keyan, On 11/09/2011 01:48 AM, Keyan wrote: > I tried to add a usleep, but the behavior didn't change, therefore, I > uploaded a screenshot to picpaste
hmm, not sure why sleeping would make a difference. The order in which things (shadow map and scene) are rendered for the first time are relevant, not so much the timing of these operations. The GPU can only do one thing at a time anyway which that serializes operations, luckily we don't have race conditions on the GPU in the way you get them on CPUs yet ;) > http://www.picpaste.com/ace364df969ce68907ae34d443b55312.jpg > > The artifacts are stable, i.e. they don't change while the simulation is > running, or lets say, some movie is playing in quicktime (i use mac os x). > > I use the coordinate system of the physics engine, therefore, the ground > plate is z = 0, and upwards in the scene is z>0, downwards is z<0. The camera > is located higher than the walking machine, hence, i looks into negative z > direction. if i rotate the camera towards positive z-axis, the artifacts > disappear, and don't show up anymore. > > It happens with any shadow mode (I tried them all, with different smoothness > parameters). hmm, those artefacts don't look like they would come from the shadow mapping [1], for that I would have expected "random" black splotches or something along those lines. The only time I've seen artefacts like those in the image was when I had a graphics card that was about to die and the memory chips started failing. Do you see artefacts with any other OpenGL programs? Are your drivers up to date? Cheers, Carsten [1] It may well be that enabling shadows triggers this for you, because that causes the scene to be rendered into an FBO instead of the application frame buffer, so the memory touched is quite different with shadows than without. ------------------------------------------------------------------------------ RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ Opensg-users mailing list Opensg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/opensg-users
