[vtkusers] Why vtkTriangleFilter does not work ?

[bxb1280]

Drear All:
  I use the following steps to generate the "pure" triangle meshes from 
3d vtkImageData, but found that there are serveral lines in the polydata.

 vtkmarchingcubes->SetInput(vtkImageData->Getoutput());
 vtkTriangleFilter->SetInput(vtkmarchingcubes->Getoutput());
 vtkTriangleFilter->PassVertsOff();
 vtkTriangleFilter->PassLinesOff();
 vtkQuadricDecimation->SetInput(vtkTriangleFilter->Getoutput());
 vtkCleanPolyData->SetInput(vtkQuadricDecimation->Getoutput());
 vtkTriangleFilter->SetInput(vtkCleanPolyData->Getoutput());
 vtkTriangleFilter->PassVertsOff();
 vtkTriangleFilter->PassLinesOff();
 ...save the data to files

the document said there should no lines and vertices in triangle meshes 
if setting the PassLinesOff() and PassVertsOff(),but it does not work at all!
I use Ansys software to import the polydata, it said "the line 18 is used 1 times,
please check the data" 
Can anybody tell me how to obtain the "pure" triangle meshes?,that is no additional 
lines and vertices in the mesh.
 Thanks a lot!

kenny wang
 				
　　　　　　　　　　　　　　bxb1280
　　　　　　　　　　　　　　bxb1280 at sina.com
　　　　　　　　　　　　　　　　　2003-09-12