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Hi there,<br /><br />I use vtkActor's (vtkSphereSource-> vtkPolyDataMapper-> vtkActor), which lie on a surface.<br />How can I create a contour line between two of these actors?<br /><br />In an older post (Tue May 8 2012), I used vtkContourWidget, vtkPolygonalSurfacePointPlacer and vtkPolygonalSurfaceContourLineInterpolator to display a contour. <br />But the contour lines are not on the surface. (Please look at the older post.)<br /><br /><br />Thanks<br /><br />Daniel
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