Hi there, Is there a way in grasshopper that can generate a 3d concave hull? The example here shows the slabs of a building and a mesh is the desired output from the outside points? Any ideas are appreciated. Thanks in advance :smiley: [Skjermbilde (60)] 3d Concave hull question.gh (63.0 KB)

If the nodes (Points) are “suitable” (a big thing that one) there’s various ways like using parallel *Ball Pivot (blame IBM Labs for that) or Marching Cubes, Crust, CoCone algos and the likes. If on the other hand your nodes are not that “ideal” there’s also various ways. Yoo can also “wrap” your o…

Thank you for your kind response, I tried the ball pivot method and it did not yield good results. maybe K2 could offer some better reuslts. I guess I have to look into methods online and try to integrate that into GH. Thanks

If you’re trying to wrap points not solids I’d suggest looking at alpha shapes. I remember Laurent posted some 3d implementation: [image] Alpha Shape 3D Grasshopper Here is an implementation of 3D alpha shape, it is using 3D DelaunayCell (standard GH component ??). https…

[image] ahmadalhiyali: good results As I said the “spread” of the points (i.e. are they “evenly” distributed ?) affects BP/MC results. Plus there’s the quality of the code (Bernardini et all just outlined the idea - implementaion is another animal). That said I’ve seen some free indicative at…

3d Concave hull

Grasshopper

ahmadalhiyali (Mikael) August 31, 2021, 12:22pm 6

Hi @DanielPiker

I have tried that method and the result I get is an invalid mesh! Do you have any ideas why could that be ?

Alpha shape 3d.gh (52.7 KB)

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3d Concave hull

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