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I have instances on points and some manipulations with them, so that the instance meshes are geometrically different. Is there a way to apply Convex Hull on each instance separately, or on realized geometries? Maybe using Mesh Island or Accumulate Field?

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  • $\begingroup$ Thinking from the right side, since Convex Hull node outputs a single hull, how would you then combine an arbitrary number of geometries with a constant (unlike in Chris'es answer) setup of nodes... I don't see a way. $\endgroup$ May 10, 2022 at 10:50
  • $\begingroup$ Wouldn't a Geometry to Instances (plural) node be nice... grouping by some attribute (typically, mesh-island) $\endgroup$
    – Robin Betts
    May 10, 2022 at 11:09

1 Answer 1

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yes, you can use this node setup:

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node group:

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result:

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starting geometry:

just a subdivided cube:

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result:

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Note: you have to add as many nodegroups-nodes as you have mesh islands minus 1.

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    $\begingroup$ The way I read it, it applies convex hull only on the first cube, no? And the node layout depends on the number of islands? I'd multiply the middle points positions by x < 1 to make it clearly concave, and then test. $\endgroup$ May 10, 2022 at 9:41
  • $\begingroup$ you are totally right...i forgot the convex hull node in the nodegroup...sorry. i updated my answer $\endgroup$
    – Chris
    May 10, 2022 at 9:44

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