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[dazz777]

Hi,

Here are some of the keywords that could help you in the search of a solution to combine multiple meshes in one:
- Mesh boolean operations
- CSG Constructive solid geometry
Those are basically techniques to combine and subtract meshes with/from each other

Here is a Unity asset I found that has CSG in it
https://www.youtube.com/watch?v=KjfMWICV-3U

Maybe there are other assets like this one in the "modeling" category of the asset store
https://assetstore.unity.com/tools/modeling

If you can't find a ready made unity asset, then maybe looking for a c# implementation of boolean operations will yield satisfying results. Otherwise, you might have to save your meshes into mesh files, use an external application (which removes the constraint of finding a solution implemented with c#) to do the combining, then import the result back into unity.

I hope this helps

Thanks for the pointers, I'll certainly look into them.