■ Importing and Preparing a Mesh for Sculpting 89marquee anywhere off the model on the document background. To reveal all groups again,
Ctrl+Shift-click anywhere off the model on the document background.
You create polygroups by choosing Tool → Polygroups. In the resulting dialog box
you will find several options: Auto Groups, Auto Groups With UV, V Groups, Group
Visible, From polypaint, From Masking, and two sliders to control tolerance for the poly-
paint and masking group options. Auto Groups will automatically create polygroups from
separate objects in an imported OBJ file—for example, if you imported an OBJ that was a
sphere and a box (Figure 3.16) ZBrush loads them as a single tool. You cannot manipulate
them independently from each other. Auto Groups will automatically polygroup the two
objects since the OBJ file recognizes them as separate objects even though they import as
one tool (Figure 3.17). Auto Groups with UV will generate groups based on the UVs and
topology of the object.
Figure 3.16 Sphere and box OBJ file
Figure 3.17 Polygrouped sphere and box