[Paraview] Opacity Issues

[David Lonie]

On Fri, Jun 24, 2016 at 1:10 PM, Paluszek, Lukasz <
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.

Dave
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