<DIV>Dear VTK users,<BR> I constructed some polygonal data and visualized these polylines. But I<BR>got the following error and warning messages <BR> <BR>ERROR: In ..\..\Filtering\vtkPolyLine.cxx, line 102<BR>vtkPolyLine (05A503E0): Coincident points in polyline...can't compute<BR>normals<BR> <BR>Warning: In ..\..\Graphics\vtkTubeFilter.cxx, line 217<BR>vtkTubeFilter (059619B8): Could not generate normals for line. Skipping to<BR>next.<BR><BR> I would be grateful to anyone who can explain the possible reason(s)<BR>that cause these errors and warnings and How can I isolate or determine the<BR>location of these coincident points in polygonal data ?</DIV>
<DIV> </DIV>
<DIV>Best regards!<BR></DIV>