[vtkusers] How can I create a contour line?

[ich_daniel at habmalnefrage.de]

Hi there,

I use vtkActor's (vtkSphereSource-> vtkPolyDataMapper-> vtkActor), which 
lie on a surface.
How can I create a contour line between two of these actors?

In an older post (Tue May 8 2012), I used vtkContourWidget, 
vtkPolygonalSurfacePointPlacer and 
vtkPolygonalSurfaceContourLineInterpolator to display a contour. 
But the contour lines are not on the surface. (Please look at the older 
post.)


Thanks

Daniel    
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