Brush Order

You may notice that sometimes a subtractive brush cuts into one additive brush, but not another.

This is because brushes are order dependent, they're like a set of commands such as Build this, Now cut into it, Now build on top of that, which are shown in the following screenshot:

If we want the subtractive brush to cut into both the additive brushes, we can make it the last command in the list. Select the subtractive brush, right-click on it, and select Order | To Last.

Now the brushes are in the order we want.

And if we rebuild geometry, we get the results we want.

And yes, you could have also selected the #3 additive brushes and clicked on Order | To First, to get the same result.

What just happened?

So we know how to use the builder brush tool to create our first cube. Let's go ahead and look at the geometry editing mode tool.