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Unreal Development Kit Beginner’s Guide by Richard J. Moore

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Brush Order

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

Brush Order

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:

Brush Order

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, ...

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