[Paraview] Polyhedral Cells: Rendering Problem with OpenGL...
Joachim Pouderoux
joachim.pouderoux at kitware.com
Mon Oct 31 08:54:52 EDT 2016
Surprisingly I have not been able to reproduce the issue with ParaView
5.2rc2/OpenGL2.
For the Slice filter, the "Triangulate the slice" option is turned ON by
default.
Then ParaView polygonal data representation has a "Triangulate" advanced
option that is turned OFF by default but you could need if data is not
triangulated.
J.
*Joachim Pouderoux*, PhD
*Technical Expert - Scientific Computing Team*
*Kitware SAS <http://www.kitware.fr>*
2016-10-26 9:23 GMT-04:00 Ken Martin <ken.martin at kitware.com>:
> Basically it is OpenGL, in that OpenGL doesn't automatically tessellate
> concave polygons. Making VTK always examine every polygon to determine if
> it is concave would be a performance hit for everyone, so we leave it up
> to developers to use a triangle filter if they need it.
>
> Thanks
> Ken
>
> On Tue, Oct 18, 2016 at 9:11 AM, Stefan Melber <Stefan.Melber at dlr.de>
> wrote:
>
>> 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>
>> 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*
>>> _/_/
>>> _/ _/ Deutsches Zentrum für Luft-
>>> _/_/_/_/_/_/_/_/_/_/ und Raumfahrt e.V. (DLR)
>>> _/ _/ _/ _/
>>> _/ _/ _/ _/ German Aerospace Center
>>> _/_/_/_/_/_/_/_/_/_/ Institute of Aerodynamics
>>> _/ _/ _ _ and Flow Technology
>>> _/_/ | \ | |_| Transport Aircraft Branch
>>> _/ |_/ |_ | \
>>> Lilienthalplatz 7
>>> Fields of activities: 38108 Braunschweig
>>> Germany
>>> o Numerical Windtunnel Simulation
>>> o Aero-Acoustic Windtunnel Design Phone : +49 531/295-2836
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>>> o Visualization Techniques
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>>>
>>>
>>> ================================================================
>>>
>>>
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>>
>>
>> --
>> Ken Martin PhD
>> Chairman & CFO
>> Kitware Inc.
>> 28 Corporate Drive
>> Clifton Park NY 12065
>> 518 371 3971
>>
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>>
>>
>
>
> --
> Ken Martin PhD
> Chairman & CFO
> Kitware Inc.
> 28 Corporate Drive
> Clifton Park NY 12065
> 518 371 3971
>
> This communication, including all attachments, contains confidential and
> legally privileged information, and it is intended only for the use of the
> addressee. Access to this email by anyone else is unauthorized. If you are
> not the intended recipient, any disclosure, copying, distribution or any
> action taken in reliance on it is prohibited and may be unlawful. If you
> received this communication in error please notify us immediately and
> destroy the original message. Thank you.
>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at http://www.kitware.com/
> opensource/opensource.html
>
> Please keep messages on-topic and check the ParaView Wiki at:
> http://paraview.org/Wiki/ParaView
>
> Search the list archives at: http://markmail.org/search/?q=ParaView
>
> Follow this link to subscribe/unsubscribe:
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