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I'm trying to use vertex group to instance an object in geometry node, for example, a table with his legs. But don't work

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2 Answers 2

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Edit: I think that Gabriel's suggestion of using the "point separate" node is a more flexible solution.

Each vertex has a weight from each vertex group available attribute:

If we create a cube with a vertex group lid, each vertex gets a new attribute "lid" that contains the vertex weight:

vertex group highlighted

Then we can multiply the scale of each point by this vertex weight and create our instances on all vertices:

Instanced icospheres on vertex group

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  • $\begingroup$ I cannot seem to find some of these Geo Nodes in v3.0 -- any hints? $\endgroup$
    – james_t
    Jan 4, 2022 at 23:29
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The above answer still keeps the instances with 0 scale, so if you use that in an object with a more complex geometry you will get lots of instances, resulting in an unresponsive viewport.

I found using a "pont separate" node instead solves the issue, you use the vertex group as mask and the "geometry 2" output gives you only the vertex group. enter image description here

In my image I have an inverted U bike rack which have 2 vertex groups consisting of a single vertex on each side each, I used it to put bikes in the racks with particle systems, but geometry nodes make it much more controllable, now I can orientate the bikes as I want :D

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  • $\begingroup$ Good solution. It also works if the first node is the default "Group Input" instead of "Object Info". $\endgroup$
    – Kei MURATAGAWA
    Jun 19, 2021 at 13:08
  • $\begingroup$ This feels like a better solution than mine. Nice catch, Gabriel! $\endgroup$
    – Rob Syme
    Jun 22, 2021 at 17:42

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