i attached a quick Blenders geometry node example that packs all same mat ID UV islands in sort of automated style as rows. it uses material id index to shift UV in U direction each in 1 . So each UV islands having mat ID 1 shifts to 1 , islands with matID2 shifts to 2 etc. They all scales back to 0-1 in the end . I have 4…
I asked chat GPT to make me script using same idea. Packing matID as UDIMs pattern 4x4 first then normalize for selected objects . Took it seconds and it understand the idea quicker than a typical programmer adding extra helpful features I have not even thought about like working with 12 materials and doing 4x3 pattern .…