I'm not sure if this is your issue, but you might try using a triangle
filter on your data. For OpenGL we do not guarantee correct rendering of
concave polygons. The triangle filter will convert a concave polygon into
convex triangles which should render correctly.

On Tue, Oct 18, 2016 at 2:20 AM, Stefan Melber <stefan.mel...@dlr.de> wrote:

> Hi,
>
> i found a rendering problem with cuts through polyhedral cells depending
> on which rendering backend is used. For example in PV 5.1.2 compiled with
>
> VTK_RENDERING_BACKEND = OpenGL
>
> a cut looks like error.opengl.v5_1_2.png - there is a wrong shading and
> some facets coming from the wrong starting point.
>
> Switching to OpenGL2 everything is fine (error.opengl2.v5_1_2.png). This
> problem is the same with ParaView 5.2.0RC1 and OpenGL or OpenGL2 - however
> there seems to be an additional (smaller) problem using OpenGL2: there are
> some lines drawn outside of the shell - see error.opengl2.v5_2_0rc1.png
> (cutted on a different position).
>
> The example cell is for testing is attached as "error.vtk" - cut e.g. in
> x-direction on different positions to get the described effects.
>
> Best regards,
>
>        Stefan
>
>
> System:
> o OpenSuse Tumbleweed
> o Kernel: 4.7.6-1
> o Linux 64 bit
> o NVidia Quadro 4000 / NV Driver v367.44
>
>
>
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>
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>
>
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>
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