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Choice of triangulation transformer

  • 18 March 2024
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I’m doing a project where I have to generate and compare multiple DTM TIN-models. In regards to this, I wonder:


  1. Is there a difference between TINGenerator and Surfacemodeller in regards to how the triangulation algorithms work?
  1. How does the triangulation algorithm(s) work, in more depth than that it is delaunay triangulation?
  1. ​​​​​​​Are there any other transformers/methods to produce TINs in FME?
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Best answer by hkingsbury 18 March 2024, 20:02

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hkingsbury
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  1. As you mentioned, they both use Delaunay triangulation
    https://docs.safe.com/fme/html/FME-Form-Documentation/FME-Transformers/Transformers/tingenerator.htm
    https://docs.safe.com/fme/html/FME-Form-Documentation/FME-Transformers/Transformers/surfacemodeller.htm

    Under the surface I would imagine they both use the Triangulation Factory
    https://docs.safe.com/fme/html/FME_FactFunc/doc_pages/triangulationfactory.txt
  2. The wikipedia article on Delaunay triangulation explains how the algorithm works
    https://en.wikipedia.org/wiki/Delaunay_triangulation
  3. They’re the two transformers you’d use to make a TIN
Check out the Abley FME Firesides on Youtube: https://www.youtube.com/@ableyltd

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