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<p class="MsoNormal"><span lang="EN-US">We recently switched our FEA application from vtk7.1 and the OpenGL backend to using 8.1 and the new OpenGL2 backend.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">With 7.1 we could make off-screen images from the gui application using a
<i>temporary</i> off-screen render window, temporarily moving renderers from the GUI render window to the off-screen render window, render the image and then move all renderers back to the GUI render window.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">With vtk8.1 and OpenGL2 this causes OpenGL errors.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I reproduced this with the attached script which on vtk8.1.1 and the current head leads to an openGL error:
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">ERROR: In path-to/VTK-master/Rendering/OpenGL2/vtkOpenGLPolyDataMapper.cxx, line 1814<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">vtkOpenGLPolyDataMapper (0x273dc00): failed after UpdateShader 1 OpenGL errors detected<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> 0 : (1282) Invalid operation<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">When the script is run with a global off-screen render window things work out fine.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Is my approach wrong (temporary render window, moving renderers to it temporarily) or is this a bug?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks for your help!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#C00000;mso-fareast-language:NL">DIANA FEA BV
<o:p></o:p></span></b></p>
<p class="MsoNormal"><i><span lang="EN-US" style="font-size:8.0pt;font-family:"Arial",sans-serif;mso-fareast-language:NL">Software Developers and Analysis Consultants for Civil and Geotechnical Engineering
<o:p></o:p></span></i></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:NL"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;mso-fareast-language:NL">Delftechpark 19a, 2628XJ, Delft, The Netherlands<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;mso-fareast-language:NL">Tel: +31 88 34262 15 (Direct) Tel: +31 88 34262 00 (Switchboard) Fax: +31 88 34262 99<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;mso-fareast-language:NL"><a href="http://dianafea.com/"><span style="color:blue">http://dianafea.com</span></a>
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<p class="MsoNormal"><o:p> </o:p></p>
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