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 <[email protected]>: > 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 <[email protected]> > 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 <[email protected]> >> 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 >>> o Numerical Optimization Fax. .: +49 531/295-2914 >>> o Visualization Techniques >>> o High-Lift Aerodynamics Email : [email protected] >>> o Glider-Aerodynamics Web ..: http://www.dlr.de/AS >>> >>> >>> ================================================================ >>> >>> >>> _______________________________________________ >>> 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: >>> http://public.kitware.com/mailman/listinfo/paraview >>> >>> >> >> >> -- >> 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. >> >> >> > > > -- > 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: > http://public.kitware.com/mailman/listinfo/paraview > >
_______________________________________________ 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: http://public.kitware.com/mailman/listinfo/paraview
