ProBuilder - How to boolean/subtract object from another

Hi all, been a way for some years working on UE,, next project im back on U3D.

However, i'm horrified to see some of my favorite tools, bought up and added into unity.
Now only did probuilder lose its uniqueness, but also its interface and turned into generic bleh...

Enough whining..

I got the probuilder window open, i have to shapes i want to use on shape to cut out in the other "subtract"

However, either things are grayed out, or simply not there..

Any ideas? nothing usefull on youtube, only good videos showing back when probuilder was standalone.

You can't do boolean subtraction in Probuilder.

An experimental package was made available after they were acquired to add boolean operations.

1 Like

Yes you can. You have to enable it… I know it used to do it and a Unity employee told me you have to go somewhere and enable it to get the feature. I believe he said it was in the preferences window… The boolean options used to be there already but for some reason Unity made it disabled initially (why I don’t know).

It’s an experimental build option, as Ryiah just pointed out. I’ve used Probuilder for ages and boolean was always experimental and the kinda thing you had to grab off a github branch because it had some severe bugs that did things like periodically crash the editor.

Hi guys, don't know if still useful, but I leave here for the posterity.
To enable experimental features in Unity 2019.* go to Edit -> Preferences -> ProBuilder -> Experimental Features Enabled.

Have a nice day


On Unity 2019.3.10f1, trying to toggle that checkbox does not work. It refuses to turn on. Anyone know how to turn it on in 2019.3.10?

EDIT: Ah, it refuses to turn on if you have any compiler errors in your project at that moment. After fixing those, it does turn on.

No compile error but still doesn't let to turn it on. Any solution?

i use sabre csg

1 Like

Do Unity tech team have any idea why it’s not possible to enable experimental features?

I have observed that it takes a couple of seconds for the selection/deselection of the "Experimental Features Enabled" check box to take effect. Try selecting or deselecting, moving to another menu item, and then back to ProBuilder. That has been working for me.

The issue I'm currently having is that the first subtraction of a cylinder from a plane (to make a pool table) does not work. All subsequent subtractions work fine.

I had a Stack Overflow error when I tried to apply a substraction : /


I found that if you have build for IOS - Experimental features not possible to enable. When switched to PC/Windows it works ok. Unity version 2019.4.5, 2020.1.2, 2020.1.3

1 Like

swap your items with the button in the middle


thank you very much! Save me a time!
I can confirm, switch platform to PC and and the toggle check box will work!

I had stackOver too. :frowning:
StackOverflowException: The requested operation caused a stack overflow.
UnityEngine.ProBuilder.Csg.Plane.SplitPolygon (UnityEngine.ProBuilder.Csg.Polygon polygon, System.Collections.Generic.List1[T] coplanarFront, System.Collections.Generic.List1[T] coplanarBack, System.Collections.Generic.List`1[T]

Any ideias?

Thank you so much, it’s up for me, but trying to cut a plane with a cilinder and always crash the editor

I use RealtimeCSG. CSG makes cutting hole a breeze


Still works in 2020.3.19f1

unity is crashing when i used subtraction. It works fine for union and intersection