UV Layout: Pin some shells and layout the rest around those?

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Hi!

I have 2 geos I'm combining together. The Green are UVs I want to keep intact, the pink UVs are the ones I need to layout inside all the available spaces. I tried a bunch of settings in the UV Layout sop but it never works.

Any ideas?

-Olivier
Edited by olivierth - Aug. 24, 2025 13:02:46

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Houdini_UV_Packing_Pins_01.JPG (111.5 KB)

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...The best I could find is the setting Pack into: Islands From Second Input. It does exactly the opposite of what I want. I packs INSIDE instead of OUTSIDE.

I could create a geo that would be the opposite (with booleans) and pack into that but I'd like a faster method since I'll be doing this on thousands of shapes and layouts.

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Make a group for your pink geo. Set the UV Layout to only run over that group (so the green geo isn't modified). Select the option: "Avoid Packing Over Non-Group Islands".
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