ZBrush for Digital 3-D Printing - ZBrush Creature Design: Creating Dynamic Concept Imagery for Film and Games - page 754

3. Before any model can be decimated, ZBrush must preprocess it to determine the most efficient way to
reduce the poly count while retaining details. This figure has multiple SubTools, but only the figure will
require decimation. The sphere, base, and teeth are low enough not to require reduction. With the figure
SubTool in edit mode, step up to the highest subdivision level.
4. From the Decimation Master menu, click the Preprocess Current button. Note that we are only decim-
ating the figure—if you have multiple SubTools to decimate you will click Preprocess All. ZBrush will
examine the geometry of the figure and write a cache file on disk for use when it decimates later. This