I am using the simplify brush with dynamic topology turned on, so that I can manually remesh my object, which is a head.
Everything works until I get to the ear, and try to reduce triangle density on the back of the ear (while leaving the front unchanged).
The problem I'm getting is that sometimes the brush punches through and starts operating on the far face. Even though I've checked "front faces only".
You can in the picture; I've been editing the back of the ear, and I've just turned it round to inspect the damage.
I'm guessing this is because the ear is thin?
Anyway, is there any way to prevent this?