Unity ProBuilder - Boolean Tool used to Combine, Intersect, or Subtract one shape from another.

In this tutorial, I'll show how to use the Boolean Tool in Unity's ProBuilder to Combine Shapes, Create a new shape based on the intersection of the two shapes, or to Subtract one shape from another. Super easy!! Also check out How to Make a Bounce Game Series https://bit.ly/39HIYBU. ► Download P

ProBuilder's Boolean tool is hidden behind an experimental flag, which is a shame because it's one of the more useful things in the package. It lets you combine two ProBuilder shapes, keep only their overlap, or cut one shape out of another — real constructive solid geometry modeling without leaving the Unity editor.

Step 1 — Install ProBuilder Open Window then Package Manager and switch the source to Unity Registry. Type "pro" in the search field and ProBuilder appears in the list. Install the latest version — 5.0.3 at the time of the video. Once it's in, a Tools menu appears in the menu bar where ProBuilder, ProGrids, and Polybrush all live if you have them.

Step 2 — Enable experimental features The Boolean tool won't show up until you turn experimental features on, and the setting isn't where you'd expect. It's in Unity's preferences, not the project settings — go to Unity, Preferences, then select ProBuilder in the sidebar. Check the Experimental Features Enabled box. It's unchecked by default. Give it a moment after clicking; Unity needs a second to recompile before the option registers. Once it does, a new Experimental submenu appears under Tools, ProBuilder, containing the Boolean tool.

Step 3 — Create two overlapping shapes Booleans need two objects to work with. Create a ProBuilder cube and position it in view, then create a second ProBuilder shape — an arch works well because its curved profile makes the result of each operation immediately obvious. Move the arch so it intersects the cube. The overlap is what all three operations act on, so how much the two shapes penetrate each other determines the result.

Step 4 — Understand the two slots Open the Boolean tool window and you'll see two object fields. Order matters, and this is the part that trips people up. The first slot is the object being operated on; the second is the object doing the operating. For a subtraction, drag the cube into the first field and the arch into the second, and the arch gets cut out of the cube. Reverse them and you'd get the opposite result.

Step 5 — Try intersection The first operation is Intersection, which keeps only the volume where the two shapes overlap and discards everything else. Click Apply and ProBuilder creates a brand new game object — the two source objects stay in the scene untouched, which is worth knowing, because the result spawns in the same position and appears to have done nothing until you drag it aside. Pull the new object out and you'll see the shape formed by the shared volume.

Step 6 — Try union Delete that result and switch to Union. This merges both shapes into one continuous solid — the two source objects become a single new mesh. Click Apply, drag the new object off, and you have the combined form as one game object rather than two overlapping ones. This is the operation to reach for when you want to weld separate pieces into a single prop.

Step 7 — Try subtraction Subtraction is the most immediately useful of the three. With the cube in the first slot and the arch in the second, Apply carves the arch's volume out of the cube. Drag the new game object away from the originals and you'll see a clean archway cut through the cube — a doorway, in effect, generated in a couple of clicks. As with the others, the two source objects remain, so delete them once you're happy with the result.

Between these three operations you can do a surprising amount of 3D level construction directly in the Unity editor without opening a modeling package.