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Many brushes have the effect of pulling out or building up thickness on a model. For those brushes you can quickly switch to Subtractive mode that will push in or remove shape from the model. So let's go open up the SuperAverageMan. Now, if I zoom in, I can give you just quick demonstration of the standard way that the brush is used. You can see it's pulling out on the model. There are two ways to switch a brush into Inverted or Subtract mode. The first way is to change the brush from Zadd to Zsub up here at the top bar.
So right now it's on Zadd. We'll just hit Zsub instead. Now you can see when I stroke, the effect is inverted. It's pushing in. Let's put it back on Zadd. A faster way to do it that I prefer is just to hold down the Alt key while you stroke. So now I am holding down Alt and it's pushing in. If I release Alt, it goes back to additive sculpting. One of the nice things about ZBrush is that most of the keyboard controls are clustered around the Shift, Ctrl, and Alt keys, making it easy to access this and many more keyboard functions.
You'll use that Alt key all the time to remove volume from your model as you sculpt.
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