[vtkusers] Help on selecting voxels inside a vtkImplicitFunction

[Robin Zhao]

Hi, Dear vtk guys,

I met some difficulties on selecting voxels inside a user defined implicit
function.

I have studied vtkExtractGeometry, but its output is unstructured grid.

I also studied vtkSelection which seems not to support vtkImplicitFunction.

Are there any possible methods to do it in the framework of vtk,
or do I need to do it by myself.

Cheers
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