Reference Code: https://gitlab.kitware.com/vtk/vtk/blob/fab8892a7fdf812bfaca623d0e8f982ffcc96a5b/IO/Geometry/Testing/Python/TestFLUENTReader.py
https://lorensen.github.io/VTKExamples/site/Python/IO/WriteSTL/
Reference books: Zhang Xiaodong, Luo Fire Spirit edited by VTK.
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