[Paraview] Opacity Issues

Mon Jun 27 06:06:13 EDT 2016

Switching to the old peeling implementation did the trick, no more issues and yes I am using remote rendering via pvserver.

[Beschreibung: Beschreibung: Description : cid:image001.png at 01CF0B8F.DB7831F0]
Łukasz Paluszek
Airbus Helicopters
Aerodynamics Department (ETGA)
86607 Donauwörth
Germany
Tel.: +49 (90) 671 8231
Fax.: +49 (90) 671 9122
Lukasz.Paluszek at airbus.com<mailto:Lukasz.Paluszek at airbus.com>

From: David Lonie [mailto:david.lonie at kitware.com]
Sent: 24 June 2016 21:22
To: Paluszek, Lukasz
Cc: paraview at paraview.org
Subject: Re: [Paraview] Opacity Issues

On Fri, Jun 24, 2016 at 2:15 PM, David Lonie <david.lonie at kitware.com<mailto:david.lonie at kitware.com>> wrote:
On Fri, Jun 24, 2016 at 1:10 PM, Paluszek, Lukasz <lukasz.paluszek at airbus.com<mailto:lukasz.paluszek at airbus.com>> wrote:
It doesn’t happen all the time, I suppose you need a fairly large surface dataset. I managed to reproduce the problem on a wavelet source (attached state file), try increasing the number of elements if you do not see any artifacts. I have bult Paraview from source on OpenSuse 13.1 but also cross-checked with the Linux binaries from Paraview.org and had same issues. There was no problem with the osmesa-llvm flavor though.

I couldn't reproduce this here on arch linux with a newer nVidia driver (367.27), so I'm suspicious that this is a driver bug that's affecting the new depth peeling implementation.

Since you're building from source, can you try editing VTK/Rendering/OpenGL2/vtkOpenGLRenderer.cxx, and change line 322

if (dualDepthPeelingSupported)

to

if (false)

in DeviceRenderTranslucentPolygonalGeometry, recompile using the OpenGL2 backend, and let me know if the issue goes away? I suspect it will since both the OpenGL1 backend and OpenGL2 mesa/llvm do not use the new code.

I'll put together a patch to force the older peeling implementation via an environment variable to make the work-around easier to apply.

Patch is here: https://gitlab.kitware.com/vtk/vtk/merge_requests/1589

By the way, are you running paraview with remote rendering via pvserver? I was just made aware of a similar issue with remote rendering and depth peeling.

Dave

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