Hi
Here is a quick description of ZSub,ZCut…
Some tools will produce the same action for both ZSub and ZCut while other tools will produce different action for ZCut than for ZSub.
As a general rule :
ZSub will produce different action than ZCut only for tools that are fully 3D .(i.e. tools such as Spher3D, Cylinder3D, Cube3D,Ring3D, Cone3D…)
ZSub will produce the same action as ZCut for tools that are not fully 3D (2.5 D). (i.e. tools such as SimpleBrush, FiberBrush, bumpBrush … )
Here is an image that shows the difference of ZSub and ZCut for 3D objects.
ZCut is similar to Boolean operation, which allows you to use a 3D object in order to cut a hole into another 3D object. Simply put, when you wish to cut a hole, use ZCut.
If you wish to try this for yourself, than simply draw a Sphere3D in the center of your canvas, than on top of the sphere draw a Cylinder3D and reposition it to look like step two. After you have drawn the cylinder and have repositioned it, activate the TRANFORM MOVE (press w)mode and try the ZCut,ZSub, and ZAdd modes.
I hope you’ll find this helpful
-Pixelator