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I am trying to fix this game asset's UVs. I have pinned UV islands which I do not want to move. But the rest of the UVs I want to unpack (again) into the same UV area without overlapping them. If I could get a similar texel density that would be a plus. If there is a plugin that would allow me to draw a square of where to pack UV islands/ where not to pack that would be ideal. I have the UV-packer plugin but that does not seem to be able to do it. I am using Blender 3.6 or 4.0

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When I try to pack islands with the pinned UVs locked it still overlaps:

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New Blender has an option to preserve the position of the islands when packing with pinning them with UV > Pin. Also the UV-Packer respects the pinned islands.

enter image description here

If it is just for a square to pack the new geometry into or the problem is with the UDIMs you can separate it into a new mesh pack it on its own and then joint the meshes. UDIMs are XY offsets by 1 for groups of UVs.

Can work them one by one using packing to the active UDIM.

enter image description here

Or use pack to Original bound box. But I guess you have to eyeball it.

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I believe for free there is no option to pack islands to existing island across all UDIMs maximizing the area automatically. But looks like UVPackmaster can do that.

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  • $\begingroup$ New Blender as in 4.0? $\endgroup$
    – Ben R
    Dec 15, 2023 at 18:35
  • $\begingroup$ I have it on 4.0 Beta. builder.blender.org/download/daily $\endgroup$
    – unwave
    Dec 15, 2023 at 18:55
  • $\begingroup$ I tried "pack islands" with "lock pinned islands" checked and it did not move my pinned islands but it still overlapped them $\endgroup$
    – Ben R
    Dec 15, 2023 at 19:03
  • $\begingroup$ Are the pinned islands also selected? $\endgroup$
    – unwave
    Dec 15, 2023 at 19:09
  • $\begingroup$ Yes. I pinned the islands, then, I unwrapped the non-pinned UVs from my original post (to fix their UVs). Then I selected everything and did the pack islands command (with pinned locked). $\endgroup$
    – Ben R
    Dec 15, 2023 at 19:15

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