[vtkusers] Nonrectangular selection of points (vertices) or cells (triangles) on a mesh surface (paraview like)

[David E DeMarle]

Hello,

The VTK level implementation behind ParaView's polygon selection feature is
exercised/demonstrated by
Rendering/Core/Testing/Cxx/TestPolygonSelection.cxx. You can follow that to
see how a VTK enabled app can make a non rectangular selection.

With that selection you might either extract a subset surface offset it a
bit and change the appearance, or use the preserve topology feature of
selection to make a shallow copy of the original mesh with a new array that
identifies the selected primitives, and use that array as input to the
coloration of the whole to modify its appearance.

David E DeMarle
Kitware, Inc.
Principal Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909
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