<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=DE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi David,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>To be honest I did not check your code very carefully, but from what you write, I had once a similar problem with some concave poly data. Googling I found some older threads reporting similar issues of incorrect displaying some concave poly data. They recommended to apply a vtkTriangleFilter before sending the data to the mapper, and in my case that did the trick.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hope this helps,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Daniel<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Von:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> vtkusers-bounces@vtk.org [mailto:vtkusers-bounces@vtk.org] <b>Im Auftrag von </b>David Doria<br><b>Gesendet:</b> Mittwoch, 13. Juli 2011 20:50<br><b>An:</b> vtkusers@vtk.org<br><b>Betreff:</b> [vtkusers] Strange vtkPolygon behavior<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>The following code creates a contour, and then attempts to create a polygon on the same points to "fill in" the contour:<o:p></o:p></p></div><p class=MsoNormal><a href="http://codepad.org/OxnvsZe6">http://codepad.org/OxnvsZe6</a><o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>The contour looks as expected in Paraview, but the polygon is broken (there are overlapping triangles, etc). I also tried adding the points in the reverse order (as you can see in PolygonFromContourClockwise vs PolygonFromContourCounterClockwise), but that doesn't seem to be the problem.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>The last point is not repeated (as per the documentation's requirement) and there are no self intersections.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Can anyone see where I am going wrong?<o:p></o:p></p></div><div><p class=MsoNormal><br clear=all>Thanks,<br><br>David<o:p></o:p></p></div></div></body></html>