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I am instancing shapes on the points of a mesh, assigning each instance an index, which I then put into the group output to be used in the shader to make each instance a different colour.

I am doing this by capturing the Index (I have tried ID as well) before realising the instances, and this is working fine.

enter image description here

enter image description here

The problem comes after I am applying the boolean, which makes sense to me since I am modifying the instances and new geometry is being created, but I would still like to be able to have each instance be one solid colour. Instead, it looks like the new geometry is created with differing Indexes than what I would expect based on the attribute I am capturing. Is there some way to reapply the Index that I have captured? See the images for the output I am getting.

enter image description here

enter image description here

Apologies if any of my terminology is incorrect, I am still learning.

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  • $\begingroup$ Hi, could you share your blend file? Would make it much easier to understand and develop the setup. You can use blend-exchange.com if you want. Thanks. $\endgroup$
    – Kuboå
    Commented Nov 23, 2022 at 17:08
  • $\begingroup$ Sure @Kuboå, you can find it here: blend-exchange.com/b/6AYnqJbo $\endgroup$
    – David Welman
    Commented Nov 23, 2022 at 17:18
  • $\begingroup$ Don't have much time atm so I'll have to come back to this later if no one else answers, but from a cursory first look I wondered if capturing the attribute after the boolean operation (as Mesh Island Index rather than normal Index) would work for you? i.imgur.com/0UPgG7d.png Or do you need to do it before because of some other reason? $\endgroup$
    – Kuboå
    Commented Nov 23, 2022 at 17:30
  • $\begingroup$ That was it, thank you! No I didn't need it before for any reason, still learning so I had no idea Mesh Island was an option. You rock, thanks for the help! $\endgroup$
    – David Welman
    Commented Nov 23, 2022 at 17:51

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