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  1. On default cube, add a new vertex group, call it Group, leave it empty.

  2. On default cube, add geometry nodes modifier and bevel modifier. Make bevel modifier use the vertex group.

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  1. In geometry nodes add attribute fill node, use Group attribute and set it to 1. Magically, the cube will now get beveled.

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  1. Replace the original geometry with a mesh primitive, for example a different cube. Weirdly, the cube is no longer beveled.

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How can I assign vertices of a mesh primitive to a vertex group? I have checked the spreadsheet and it looks like the vertices are actually in the vertex group, but the bevel modifier does not react to it.

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Dalibor-P
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    Looks like there is no way to initialize actual vertex groups on instanced geometry. I'd say it is a current limitation of the system – Gorgious Jul 01 '21 at 09:18
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    I agree with Gorgious. AFAIK there is no way to do it now. – Chris Jul 01 '21 at 09:23
  • The thought crossed my mind too. Oh well. – Dalibor-P Jul 01 '21 at 09:25
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    If anybody's interested, this is known issue, with some work being done on it; see https://developer.blender.org/T88334 . Basically, in 2.93 GN is using instancing code to improve performance, but the instancing doesn't allow for full mesh properties. At least, that's my amateur understanding. – Nathan Jul 01 '21 at 15:44

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