That was not intended to be a solution, but rather a diagnostic. My guess is that there are precision errors in the rasterization when the viewport is shifted. Could you restore vtkIceTRenderManager and try the attached patch to IceT?
-Ken On 12/10/09 12:26 PM, "burlen" <[email protected]> wrote: Hi Ken, it seems to have solved the problems. I say that with fingers crossed, I haven't seen holes any since your suggested changes, where before I was seeing them quite often, popping up from time to time. Burlen Moreland, Kenneth wrote: > Hmm. It is possible that the "floating viewport" feature of IceT could > be causing troubles with precision. Could you try adding > > icetDisable(ICET_FLOATING_VIEWPORT); > > > somewhere in the vtkIceTRenderManager::UpdateIceTContext() method and > see if the problem goes away? > > -Ken > > > On 12/7/09 10:11 AM, "burlen" <[email protected]> wrote: > > Hi Ken, > For that figure you mention I turned on "surface with edges" to > show the > cell size better. Sorry I can see how that could be confusing. But > just > to clarify, there aren't actually any holes in the surface. > > Here is another zoom in of the same area where "surface with edges" is > off and you can see that there are no holes. > http://nashi-submaster.ucsd.edu/movies/PV/bug-zoom.png > > Now I also have hit a case where after running through D3 I got a hole > at the process boundary. this run had 80 processes, the surface shown > has dimensions of 5.5 x 10 units with 1500 x 2727quads with side > 0.0036 > units. > http://nashi-submaster.ucsd.edu/movies/PV/bug-d3.png > > I am only seeing this with the small quads and in parallel at process > boundaries. > > Burlen > > > Moreland, Kenneth wrote: > > Burlen, > > > > For the zoom in, you say there are no holes/lines, but in the image I > > see a grid of lines. It looks like you have a bunch of little quads > > with spacing in between them. Is this the case? If so, then the > "hole" > > artifacts you see on the bottom of the screen are probably simply > > aliasing artifacts. They are places where the pixel happens to align > > right where the gap is. > > > > I can't think of an easy way around this (other than to modify your > > data to remove the gaps, if that makes sense). Anti-aliasing > > techniques such as oversampling or smoothing would probably fix the > > problem, but they would also break the parallel rendering so they are > > no good. > > > > -Ken > > > > > > On 12/5/09 12:18 AM, "burlen" <[email protected]> wrote: > > > > its ugly but I get a lot better performance by splitting the work up > > dynamically with a small grain size. in the run shown below there are > > only 16 processes but there are a whole lot of process boundaries. > > > > I was able to reproduce it on a second system today. > > > > these holes are pretty non-deterministic in where they show up. > moving > > the camera they can show up in different places. Which makes sense if > > this is related to some parallel rendering/finite precision issue > with > > all those process boundaries. The small size of the quads are also a > > factor, because I didn't ever notice it before when using larger > > quads. > > > > I saved the data as a legacy file and opening it on my desktop > > there are > > no issues, so its definitely a parallel only issue. Also running > > through > > D3 seems to fix it, but the issue may still be there because with the > > minimal number of process boundaries its much less likely to get the > > camera in just the right position. > > > > Berk Geveci wrote: > > > Ouch. That's very distributed :-) Does the problem go away when you > > > decrease the number of partitions? > > > > > > On Thu, Dec 3, 2009 at 10:55 AM, burlen <[email protected]> > > wrote: > > > > > >> I'm seeing lines where the background shows through a surface > > polydata of > > >> quads. When I zoom into the region to investigate the holes are > > gone. Moving > > >> the image around the holes appear in different places. They > > depend on camera > > >> position. In this surface there are 2.5E6 quads. the area is > > 10x16 units and > > >> the number of quads is 1250x2000. each quad has 0.008 units on a > > side. I > > >> hadn't seen the holes before going to this higher resolution. > > It's likely > > >> that the hole is near a process boundary, in my polydata filter > > each process > > >> adds his quads to his output polydata, in this run the quads are > > distributed > > >> in strips of 512 as needed. > > >> > > >> 3 holes/lines in bottom half of the image (black background > > shows through): > > >> http://nashi-submaster.ucsd.edu/movies/PV/bug.png > > >> > > >> zoom in no holes/lines: > > >> http://nashi-submaster.ucsd.edu/movies/PV/bug-zoom-2.png > > >> > > >> process boundaries (from process id filter): > > >> http://nashi-submaster.ucsd.edu/movies/PV/bug-procs.png > > >> > > >> Should PV be able to handle a polydata distributed like this? > > >> > > >> > > >> > > >> _______________________________________________ > > >> 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 > > >> > > >> > > > > _______________________________________________ > > 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
IceTHoles.patch
Description: IceTHoles.patch
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