I was looking at the FSHTool code because I want to know if I can use it in t3ed.
I made one small change to it. You now get only a warning if your bitmap has other geometry then written in index.fsh. I hope I didn’t messed up the code stability. Please try it out.
Tried with a single texture so far, but it looks promising since that means less time spent editing the index file
(https://i.imgur.com/nKLc7Nw.jpg)