It seems that the flatten tool of the terrain editor is braindead. I’m trying to flatten a ceiling in a cavern and the tool is just simply not working. Did Roblox ever conceive that someone might want to use it on a cavern ceiling?
It’s basically the same as yours. Circle, Strength = 1, Size is whatever I need it, usually between 2 and 10. The rest of the settings are the same that you have.
If this does not work, then try restarting Studio. If that still does not work, use the erode and smooth tools.
If you want to flatten the ceiling from the inside out… you should change the pivot to Top and select the Fixed Plane, then adjust the plane to where you would like it to flatten.
If the ceiling is rounded and not a flat ceiling… you will have to use the flatten tool without the fixed plane, but the smoothing tool is probably easier to use in that instance.
I tried changing the pivot point and using a fixed plane, but that didn’t work either. It seems to only want to flatten terrain right side up, not upside down.
The only way that I was able to deal with this was to just use the erode tool and get it to about where I need it.