[Paraview] Polyhedral Cells: Rendering Problem with OpenGL...

[Stefan Melber]

Hi Martin,

i tried the triangle filter in all cases - and yes - i works in all 
three cases.

So is this "problem" of concave polygons inside VTK or in OpenGL?

Best regards,

       Stefan
> 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.Melber at dlr.de 
> <mailto:Stefan.Melber at 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
>
>
>
>     ================================================================
>
>                          _/ *Dr. Stefan Melber-Wilkending*
>                        _/_/
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>
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> Kitware Inc.
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