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I would like to ask how to expand or erode vertex group which is setting by alpha of texture. If there are non-destructive system it will be best. Thank you very much.

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I'm not exactly sure what your asking but you could use a displacement modifier with a texture attached. Then extrude all the vertices out and delete them. If that's what your asking.

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    $\begingroup$ I would like somethink like this: blender.stackexchange.com/questions/76497/… but with vertex group. I cant select vertexes by alpha and then expand the selection ... A) maybe it can be done with alpha itself, but i dont know how to joint compositing erode/diletate node to txture slot. B) or I must use vertex weight edit then collapse it(apply) and after that select vertices by edit mode > select vertext group and psuh ctrl and +. But i would like to find more automated or controlled solution. $\endgroup$
    – MRL
    Commented Jan 31, 2018 at 11:02
  • $\begingroup$ I'd suggest add that to your question @MRL $\endgroup$
    – brockmann
    Commented Oct 12, 2020 at 9:18
  • $\begingroup$ You can use a vertex weight edit modifier, modulated by a texture specified in the modifier; with the texture set up to use an image. I'm not sure exactly what you're after, so I couldn't tell you more-- just that it sounds like that's what you should be looking at. $\endgroup$
    – Nathan
    Commented Jun 13, 2021 at 3:51

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