Need Help: Exporting UV Layouts from UDIM Tiles

[Pte Jack]

I've been trying to export some UV Layouts from a model that I've combined all the mesh together into a single object and created UDIM tiles for the materials. When I use the Export UV Layout function of the UV Editor, it doesn't matter what I have selected, whether I have ALL UVs selected or not, all I'm getting is a PNG of Tile 1.

As UDIMs are new in 2.83 I have to ask,

"Have UDIMs been thought through and implemented to the point of being able to get these layouts out of Blender, is it a feature that yet to be developed and added, will it ever be possible or am I missing something in my attempts to get them?"

https://steamcommunity.com/sharedfiles/filedetails/?id=2145885317

Thanks gang!

[Blender Release Team]

Have you checked https://docs.blender.org/manual/en/latest/modeling/meshes/uv/workflows/udims.html ?

Right, I missed the part where you said you're using uv layout export

[Blender Release Team]

At the moment you'll have to do some manual work to get all these exported.

The manual says on the page I linked:

Currently, existing textures cannot be added to a tile, to fill a tile with an existing texture you first must:

* Create the desired tiles.
* Save the image.
* Replace the saved image file with the desire texture by deleting the file and replacing it with a new image file, keeping the old file name. Or by opening the image in another application and modifying the contents of the image.

This essentially means you have to export the uv layout for each island separately. Then integrate back into the UDIM texture. A bit of a bummer yes :/

[Pte Jack]

Thanks for the reply BRT...

Yup, I've look at that, however it doesn't get into exporting UV layouts. Then there's this

https://developer.blender.org/T74325 (Someone pointed me here)

Looks like it's been a problem for a while and is still on the TODO list.

I don't think it's possible right now (without writing some kind of script or finding an add-on if one exists).

I've even tried to set up material nodes to see if I could fudge something with a UV Bake, but other than the texture coords node there's nothing to trick Blender into looking at tiles unless you have some sort of image texture set to UDIM Tiles and pointed to a specific UDIM tile for it to look at in the first place. (the UV bake results in Tile 1 output only to a texture.)

Added while you were sending your second response. Sorry about that, chief...

[Blender Release Team]

Good you found the tracker. Indeed, still open (as quite many other UDIM related bits and pieces: task T72390 over at developer dot blender dot org)

[Pte Jack]

Again, thanks for your response BRT, but if you were linking me to a different place, your link was removed.

[Blender Release Team]

Meh, I hadn't realized links get removed. Not very useful. Edited my response with a stupid workaround.

[Pte Jack]

Yeah, anything Steam might think maybe a malicious outside link gets removed. Mediafire is a big one that gets the treatment. It actually shocked me that the developer site at blender(dot)org would be affected because blender.org usually works. (Might be something you can clear up with your Steam Contact Rep)

[Blender Release Team]

Maybe the release account needs some extra time to gain 'reputation' ¯\_(ツ)_/¯