ZBrush includes a complete Boolean system in addition to its other Boolean-style features like DynaMesh and Remesh All. These features all use the SubTool operators to define if a SubTool will be used as an Addition, Subtraction or Intersection model.
-Selecting a subtool
-selecting qCube
-Cube subdivided into two polys each side
-LiveBooleans works similar to Dynamesh in that it develops as you go along with your sculpt
Two Types of Boolean
The Live Boolean mode found in the Render >> Render Booleans sub-palette lets you preview in real-time the results of Boolean operations on your SubTools. You can move, scale, rotate, duplicate, change the operation mode and even sculpt in this mode. In the default ZBrush UI, the Live Boolean switch is readily accessed to the left of the Edit mode button.
The Make Boolean Mesh function, found in the Tool >> SubTool >> Boolean sub-palette converts all Boolean operations to a new Tool. These results can be reused for further Boolean operations inside of ZBrush or exported to other 3D applications.
3 Main Parts
-Additive
-Subtractive
-Intersection
SOURCE:
http://docs.pixologic.com/user-guide/3d-modeling/modeling-basics/creating-meshes/live-boolean/
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