UDIM and Material slots

Support Basics & Interface
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1

I have a character that has been retopo, UV unwrapped with UDIMS. How do I assign individual material slot to the individual UDIMS? i.e, material slots 1 (i.e., head) to correspond only to UDIM slot 1001…etc…etc…

i’m trying to assign individual vertex from the model and from the UV editor but thats not working…

2

If you want to have 1 material correlate to 1 UDIM tile then you have to pack the head - in your example - to the 1001 UDIM tile and assign a separate material only to the head like ‘Head’.

UDIMS and Materials don’t have to be connected / separated, you can have 1 material that spread across 2 or 3 UDIMS also. You just have to make sure to assign that material to whatever Mesh or Vertex group you need the material to appear on.

3

I think you have to think the other way round… not:

But:

How do i also assign UDIMs to another material (for the same model) ?

Because when for example just assigning a new material (here for the top face)… then there are no UDIM’s at all (here using a simple UV as color for presentational purpose…)

UDIM’s are part of the “image-mapping-setup” and not of the material setup per se.

4

I don’t know if there is a function to separate UDIM.

gdfgd
gdfgd1770×882 218 KB

But it seems that you can create a UDIM mask and use it.
If you use 4 UVs in UDIM, you can simply separate it into a mask image using RGB.
But if you use more colors, you will need to use a node that can separate colors.