[vtkusers] Extracting the zero levelset curve in VTK

[Arne Hansen]

Hello. In the ITK package there is a filter called
itk::ZeroCrossingImageFilter which is able to extract the zero-levelset
curve in a levelset.
I need to be able to do this in vtk, so my question is if there is a similar
method in VTK that can be used for this purpose. Thank you in advance.
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