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

[Berti Krüger]

Hello everyone.

In my project i have a standard 3D STL triangle surface mesh where i need to select all vertices which lie inside a region (polygon) defined by a closed polyline created by an user interaction using the vtkContourWidget:

[cid:6bce5125-0cf4-43a0-962c-cc9dd5a593f1]

[cid:dc6cff08-ee3c-4c70-bea2-9e44a8578c05]


Paraview has a similiar feature called "select points with polygon" or "select cells with polygon":


[cid:4238abb5-92ec-41d2-a435-867a45d1a7cb]


At the end of the process i want to create a polygon mesh which has the shape of the vtkContourWidget polygon selection contour line and which lies like a sticker or texture on the the given stl mesh surface.


If anybody can help me with ideas / suggestions / hints / pointers on how to accomplish this with vtk i would be glad.



Thank you very much in advance,


Berti

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