I am trying to figure out how to attribute multiples materials to a same object. During my experimentation I found some things. At first I was trying to put manually each materiel and set an ID, one by one...but I found out you can use the multi/channel material and set the ID there. Faster this way I guess.
Now my question is: On my edit/poly objects I can bring a UVW map on a SET ID 1, then another one on SET ID2 (Or channel). Is it better to not collapse all those UVW maps ? Because I tried once and it screw everything when I tried to add another UVW map (After the collapse). Or you only collapse those when everything is finished ?
The second question: I had an object that had 5 instances that were in 2 groups. I was texturing the first one, no problem. At one moment I collapsed my UVW map, and after that any changes on the first object didn't reflect on the other ones...Is that a bug or a normal behavior of the collapse option ?