[vtkusers] How to select a surface area

[agerlach]

Just to make sure I understand what you are looking for: You want to load a
.stl and then interactively select a region such that you can compute on the
selected region only.

Look into the following pipeline:

vtkImageTracerWidget -> vtkSelectPolyData -> vtkClipPolyData.

The output of vtkClipPolyData will be the region contained within the
"traced" area from vtkImageTracerWidget.

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