Super tip for entering numeric values for brush building and scaling

I just found this out. In any field where you can enter numerical values, like the brush builder dialogs, you can enter equations, for example say you want to create a brush, the main room is 512, the wall is 32, enter 512+32 and hit enter and there's your number.

And don't forget about the measure tool it's a godsend. Click with the middle mouse button from where you want to measure, then drag and you get a line with a number that shows how many units the line you draw is.
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