I'm guessing that this is a z-buffer precision issue. The nVidia card must be using a higher precision z-buffer or doing something else that is preventing the z-fighting that appears to be happening in the Mesa implementation.
-Ken On 1/18/10 11:47 AM, "burlen" <[email protected]> wrote: Yes, that is the case. There are 200 lines , each a single cell , and the pvtp reader splits them up fairly evenly amongst processes to begin with. D3 is moving stuff around but it doesn't noticeably change the result. Moreland, Kenneth wrote: > Looking at the mesa-artifacts-decomp.png image, it appears that you > have many tubes that are coincident (or at least close to coincident). > There might be z-buffer resolution problems. What happens if you run > the geometry through D3? > > -Ken > > > On 1/15/10 10:28 AM, "burlen" <[email protected]> wrote: > > FYI, I re-organized the images illustrating the bug, and made a > comparison of nvidia to mesa rendering on two cases 1) the > artifacts 2) > the parallel inconsistency, and removed the older images. > > 1) > > http://nashi-submaster.ucsd.edu/movies/PV/tube-filter-artifact/mesa-artifacts.png > > http://nashi-submaster.ucsd.edu/movies/PV/tube-filter-artifact/nvidia-no-artifacts-decomp.png > > 2) > > http://nashi-submaster.ucsd.edu/movies/PV/tube-filter-artifact/mesa-artifacts-decomp.png > > http://nashi-submaster.ucsd.edu/movies/PV/tube-filter-artifact/nvidia-no-artifacts.png > > burlen wrote: > > So you are right these are artifacts not holes. Nasty looking ones at > > that. zooming in enough makes the artifacts receded toward the egdes > > of the tube. After some experimentation I'm finding that this has > > something to do with mesa. It is reproducible only when using mesa. > > Hardware rendering works fine, no artifacts. > > > > There also looks to be two things going on, 1) the artifacts, 2) > > inconsistent selection of the visible faces on parallel runs. > This is > > shown here: > > > http://nashi-submaster.ucsd.edu/movies/PV/tube-filter-artifact/decomp-8-procs.png > > > > > > I was using PV on this cluster fine back in dec to make very similar > > figures with stream tubes and didn't see any of these issues... > > > > I added the dataset to reproduce to the bug report. > > > > Moreland, Kenneth wrote: > >> It could be a rendering artifact. What happens when you zoom into > >> the problem area? > >> > >> -Ken > >> > >> > >> On 1/14/10 12:24 AM, "burlen" <[email protected]> wrote: > >> > >> Any ideas as to why tubes from the tube filter aren't closed > >> surfaces > >> now? screenshot: > >> http://public.kitware.com/Bug/view.php?id=10139 > >> > >> _______________________________________________ > >> Powered by www.kitware.com > >> > >> Visit other Kitware open-source projects at > >> http://www.kitware.com/opensource/opensource.html > >> > >> Please keep messages on-topic and check the ParaView Wiki at: > >> http://paraview.org/Wiki/ParaView > >> > >> Follow this link to subscribe/unsubscribe: > >> http://www.paraview.org/mailman/listinfo/paraview > >> > >> > >> > >> > >> **** Kenneth Moreland > >> *** Sandia National Laboratories > >> *********** *** *** *** email: [email protected] > >> ** *** ** phone: (505) 844-8919 > >> *** web: http://www.cs.unm.edu/~kmorel > <http://www.cs.unm.edu/%7Ekmorel> > >> <http://www.cs.unm.edu/%7Ekmorel> > >> > > > > > > > > **** Kenneth Moreland > *** Sandia National Laboratories > *********** > *** *** *** email: [email protected] > ** *** ** phone: (505) 844-8919 > *** web: http://www.cs.unm.edu/~kmorel > <http://www.cs.unm.edu/%7Ekmorel> > **** Kenneth Moreland *** Sandia National Laboratories *********** *** *** *** email: [email protected] ** *** ** phone: (505) 844-8919 *** web: http://www.cs.unm.edu/~kmorel
_______________________________________________ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView Follow this link to subscribe/unsubscribe: http://www.paraview.org/mailman/listinfo/paraview
