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</o:shapelayout></xml><![endif]--></head><body lang=DE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Dear vtk-users,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US>I have derived a class „MyPolyDataMapper” from vtkOpenGLPolyDataMapper to implement my own mapper behavior. However, I have noticed that after I closed the vtkRenderWindow it can (!) happen that nothing is rendered. If I simplified the method “RenderPiece(vtkRenderer * renderer, vtkActor * actor)” to following function body:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US>void MyPolyDataMapper::RenderPiece( vtkRenderer * renderer, vtkActor * actor )<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US>{<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US> this->vtkOpenGLPolyDataMapper::RenderPiece( renderer, actor );<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US>} <o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US>Nevertheless, the behavior is the same. In that case, when I change, e.g., the poly data input. The rendering occurs. I think I didn’t update the mapper in an appropriate way. I have looked into the source code of “vtkOpenGLPolyDataMapper” to get an clue of how to do that but I didn’t found something yet. So, can somebody give me an hint what the reason for this behavior can be. Note, it doesn’t appear every time I close and open the vtkRenderWindow but sometimes.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US>Thanks in advance, Rocco<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US> <o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>