<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.2600.0" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV>
<DIV>Hello,</DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV>About vtkPolyData : </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV>I thought vtkPolyData was able to clip properly a polydata</DIV>
<DIV>and to create new triangles when needed.</DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV>It seems with my results that it is not the case, because my</DIV>
<DIV>vtkClipPolyData output holes when it should not.</DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV>I use it with selection loop, to extract pieces such as city area</DIV>
<DIV>on a Digital elevation/terrain model. The elevation model</DIV>
<DIV>being complete on the study area, I expected the area extracted </DIV>
<DIV>to be exactly the city area in 3D.</DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV>instead it output some triangles which does not match correctly</DIV>
<DIV>borders, creating holes for example between city areas.</DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV>Do you have any clue about how to correct this ?</DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV>Thanks in advance</DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV>Sebastien MARAUX</DIV></DIV></BODY></HTML>