[vtkusers] Iso curve visualize

[chensiqi]

Hi, VTKers.
 
I wanna visualize the zero value iso curve of a distance map overlaid on the map, ( the zero levelset curve ).  The problem is I can only see the distance map. If I rotate or zoom, even a little bit, then I can clearly see the iso curve is actually there.  Why can't I visualize it at the first place?
 
I use vtkContourFilter to extract the iso curve, add it to the vtkPolyDataMapper, then VtkActor. 
Distance map is added to vtkImageActor.
 
Thanks
Siqi
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