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<div class="moz-cite-prefix">Hi Martin,<br>
<br>
i tried the triangle filter in all cases - and yes - i works in
all three cases. <br>
<br>
So is this "problem" of concave polygons inside VTK or in OpenGL?
<br>
<br>
Best regards,<br>
<br>
Stefan<br>
</div>
<blockquote
cite="mid:CANXz0SajZXhxG+oC0k1Tby2nuNhRrzNVnE5dJpQnd3g9+h+MPw@mail.gmail.com"
type="cite">
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<div dir="ltr">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.</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Tue, Oct 18, 2016 at 2:20 AM, Stefan
Melber <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:Stefan.Melber@dlr.de" target="_blank">Stefan.Melber@dlr.de</a>></span>
wrote:<br>
<blockquote class="gmail_quote">
<div> Hi,<br>
<br>
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<br>
<br>
VTK_RENDERING_BACKEND = OpenGL<br>
<br>
a cut looks like error.opengl.v5_1_2.png - there is a
wrong shading and some facets coming from the wrong
starting point.<br>
<br>
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).<br>
<br>
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.<br>
<br>
Best regards,<br>
<br>
Stefan<br>
<br>
<br>
System:<br>
o OpenSuse Tumbleweed <br>
o Kernel: 4.7.6-1<br>
o Linux 64 bit<br>
o NVidia Quadro 4000 / NV Driver v367.44<br>
<br>
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-- <br>
<div class="gmail_signature" data-smartmail="gmail_signature">Ken
Martin PhD
<div>Chairman & CFO<br>
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