Blender - Grid Layout - Layout/Preserve Duplicated Objects UVs (UDIMS SUPPORTED)

https://www.youtube.com/watch?v=imlCXE-xNFI&ab_channel=NickHodgson

This addon is designed to preserve repeating objects UVs and unstack them into a clean layout. The addon will create vertical columns of stacking, and once that reaches capacity, it will shift over horizontally and start packing another column if required. If the texel density/number of objects exceed 1 UDIM tile, the addon will continue stacking in the next UDIM over (or move to the UDIM row above when a 1x10 UDIM grid is reached). 
Features

-UnStack Objects: UVs to automatically layout and preserve repeating objects UVs with one click.

-Stack Objects UVs: (this feature works on an object level, you cannot stack selected components, only objects that have the same UV bounding box, its only purpose  is to bring the UVs of each object back together in case you want to edit the UVs before unstacking again)

-Copy and paste texel density between objects: Ensure that the texel density is consistent between objects

What separates this addon from others is that it respects UDIM boundaries and unstacks both vertically and horizontally. No other addon on the market is capable of this. 

In big VFX studios, most pipelines do not support overlapping UVs. Not only that, but artists often have to deal with HUNDREDS of UDIMS on a single asset. This means organisation is extremely important. Since this addon ensures that objects spanning multiple UDIM sets are identical, it allows texture artists to copy and paste textures between UDIM tiles, saving countless hours in the texturing process (and obviously the UV layout process). 

With one click you can layout all of your repeating UVs in a very clean organised way.

Instructions:

The ideal way to use this addon is to pre UV the object that you are duplicating/instancing around your scene. When you want to UV, set your texel density (texel density tools included with addon) and run the unstack tool. If you need to make any alterations to your UVs after unstacking, use the stack tool to bring the UVs back on top of each other before  unstacking again.

Both the "Stack" and UnStack" operations work based on bounding boxes so make sure you have the same texel density across all your objects to get expected results.

Thank you for your support - Please rate the addon if you find it useful