Sep 7, 2015
A quick tutorial showing how you can use QMask to do cutouts with the same edge quality as painting has. Here, I realize that I want to paint 'behind' a volume I've already defined -- this is why QMask is necessary. Otherwise I would simply paint over it in one step.
(I considered other methods like vector based and freehand select, but naturally it would take a lot of fiddling to make these match the brush softness. Much simpler to just use the brush to define the selection.)