Ctl-click on a masked area partially masked to some degree. Paint Masks You can paint masks on your object directly easy way to mask out maskign of sculpting - masked.
With this active ZBrush will not effect the lower lip of a character when the upper lip is being worked on. Cavity Masking is one of three real-time masking features. The Mask By Polygroups will apply a virtual masking based upon the polygroups of the tool. You can even use it to reverse the effect of the auto cavity masking, so that cavities are not masked and non-cavity areas are masked.
