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Hello Everybody,

I have spend my last week to understand the process of UV's/UDIM, and... check a lot of forum to find a solution to my problem... and nothing.

I have a 3D Model of a puppet (3D Sculpting) import in Houdini in different object (Eyes, arms, legs.. etc). Very basic. I grouped each part and merge them.
I worked on the UV. Mainly with "UV Flatten" nodes, and some AutoUV.
I finish this part (not.. the most accurate work but.. this is for the idea)
And i placed a UVLayout. Fixed Scale, UDIM activated. Perfect.

But.. One thing i don't understand is.. : How can i say to "UVLayout" node, to make UDIM island for Legs, arms, eyes, etc.. ? 
'Cause actually, for example, my UDIM 1001 have a one leg, and one arm
UDIM 1002 have the eyes, and one ear, etc...
I tried to play with the Columns or Scale too.

So.. i can use this to paint them into substance for example. it works. 
But once i want to re-import my texture (base color, normal, etc..) into my houdini material node... it's not working the way i want.
For sure.. If i import my UDIM1001 in my material node, for the LEG Group, my arms will be affected too.

So.. i thought.. If i try to make ONE UDIM ISLAND per Object (Legs, arms, etc) .. I can paint, and re-import my material into houdini, per group,  without any problem.. 

I hope i'm clear.
I think i don't use the right way to do this.

Here's is my .HIPLC project under if you want to check and if it can help.

Thank you!

Main_Character.hiplc

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Just a little update if someone ask the same question.
Finally, i find the solution by myself.
Not... too complicated.

I tried to use only 1x UV Layout node to place each geo group into one UDIM (1001, 1002, etc..)
But.. it doesn't work. 

What's working is to use 1x UV Layout per Geo Group.
ARMS_GROUP --> UV LAYOUT ARMS | UDIM1001
LEGS_GROUP --> UV LAYOUT LEGS | UDIM1002
Etc..

So... yeah.. beginner's question, but happy to found it.

Thank you
 

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Hi Fakit,

i have same issue and also beginner's question. Have a dummy object split in 3 Parts each on different UDIM tile. Also added some color IDs that I would need in quixel mixer. My problem is that I'm not sure how to export that and get the color IDs with UDIM tiles.

Any ideas?

I have attached hiplc so it would be great if you can check it.

Thanks!

Mladen.

uv_RnD_v03.hiplc

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