I’m doing a project where I have to generate and compare multiple DTM TIN-models. In regards to this, I wonder: Is there a difference between TINGenerator and Surfacemodeller in regards to how the triangulation algorithms work?How does the triangulation algorithm(s) work, in more depth than that it is delaunay triangulation?Are there any other transformers/methods to produce TINs in FME?

As you mentioned, they both use Delaunay triangulationhttps://docs.safe.com/fme/html/FME-Form-Documentation/FME-Transformers/Transformers/tingenerator.htmhttps://docs.safe.com/fme/html/FME-Form-Documentation/FME-Transformers/Transformers/surfacemodeller.htmUnder the surface I would imagine they both use the Triangulation Factoryhttps://docs.safe.com/fme/html/FME_FactFunc/doc_pages/triangulationfactory.txtThe wikipedia article on Delaunay triangulation explains how the algorithm workshttps://en.wikipedia.org/wiki/Delaunay_triangulationThey’re the two transformers you’d use to make a TIN

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Choice of triangulation transformer

Forum|Forum|1 year ago
March 18, 2024
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anderssonaxel
Contributor

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

Is there a difference between TINGenerator and Surfacemodeller in regards to how the triangulation algorithms work?

How does the triangulation algorithm(s) work, in more depth than that it is delaunay triangulation?

Are there any other transformers/methods to produce TINs in FME?

Best answer by hkingsbury

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
The wikipedia article on Delaunay triangulation explains how the algorithm works
https://en.wikipedia.org/wiki/Delaunay_triangulation
They’re the two transformers you’d use to make a TIN

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