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.mel...@dlr.de <mailto: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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