[vtkusers] How can I set points on a contourline?

[-Daniel-]

Hi,

I want to set points on a vtkActor, which create with
vtkCutter->vtkPolyDataMapper->vtkActor. The result is an actor as a line
respectively contour.

<http://vtk.1045678.n5.nabble.com/file/n5730196/vtk_pointOnContour.jpg> 

I thought it would be easy to solve by convert this actor in a vtkPolyData
and then pick out the points. But this don't work.
How can I set points on this actor-line?




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