I’m a noob and stumbling around, so if “don’t do that” is the right answer, that’s OK. 
Quick repro (I haven’t tried it yet, but this is basically what I did.
- make a torus
- trim off a couple chunks
- add a layer
- use clay, trim and stuff on it
- try to trim a small bite, like finger grips out of one side (I still had symmetry on) off again (when I did this, it retopo-d the area a little, I saw the wireframe change but I didn’t see it take a bite out, really.
- some more random paint edits
- now move the layer slider. for me, the second I moved it, my mesh corrupted, and I only had the ends of the cut donut left. When I slid it back all the way, my mesh didn’t reappear. So starting over I guess.
Anything here that was an obvious misuse of the tool? I can imagine the Trim breaks the core topology for morphs and that makes sense I guess.
As a user, I’d rather the tool just error and not work on a layer.
thanks.
but I didn’t see it take a bite out, really.
Trim tool simply remove all the faces in the shape volume, and then refills the hole.
The hole is smooth so that’s why it looks like you didn’t trim much.
ZBrush Trim has the same limitation.
Something I’d like to try is mixing the Trim and Project together to get it working perfectly but it’s a bit experimental and not top priority.
the second I moved it, my mesh corrupted, and I only had the ends of the cut donut left.
Looks like a bug but I could not reproduce it.
Are you on Version 1.23?
Ideally a video could help a lot if you can reproduce the issue.
OK, I’ll try to repro.
Thanks for responding.
Just FYI, undo didn’t help
I’m on 1.23
Here’s where the missing mesh was (red)
Thanks!
Note that the trim can sometimes outputs faces that are inverted (yellow in Nomad by default).
It’s going to be fixed on the next release.
That being said I don’t think it can explain your issues, from the look of it there’s a division by 0 and then it gets spread.
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