sss udim is not generated

[Alessandro Padovani]

daz studio 4.15, blender 2.93, commit 2a7a27d

It seems the udim tiles for sss are not generated.

steps:

1. import G8F
2. save local textures
3. make udim materials

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[Alessandro Padovani]

This also makes merge materials essentially not working with udims because we get different maps for sss, instead of the same udim map.

[Thomas Larsson]

Fixed in last commit. Now most skin materials merge, but not face and torso for some reason.

[Thomas Larsson]

Now the merging is fixed. It turned out that some group nodes had different names even though they contained the same node tree.

[Alessandro Padovani]

Commit 1e9a95c seems to work fine, thank you Thomas for the nice update on udims. This also fixes #381 so I’ll resolve both.