How do I use a subtractive geometry brush?
To use a Subtractive geometry brush, you only need to switch the Brush Type in the Details panel while the brush is selected. If you position the Subtractive Brush inside an Additive Brush, it will subtract the area from the Additive Brush.
You can read more about geometry brushes here:
Let me know if you have any more questions!
answered Jun 30 '14 at 05:34 PM
I found that, you need to place your FILL objects first , then add the substraction brush (box, cilinder, etc) . If you add another new FILL box, it will NOT be substracted with the previously added substraction brush.
From official doc > ... "... from previously created additive Brushes."
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