Hi Carsten, I tested my code on a second computer and I get the same sort of artifacts (they vary, every time I start my application).
Regards, Keyan On 10 Nov 2011, at 19:07, Carsten Neumann wrote: > 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 ------------------------------------------------------------------------------ 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
