Figure 13.

Set theory operations that are useful for characterizing differences between models generated from images for 3D printing. The operations of volumes (or voxel collections) in set theory notation and shorthand (in parentheses), as well as visual color depictions of the volumes corresponding to the operations, are listed in the first (far left) column. For example, the volume of space (or voxels) belonging to model A is depicted in red, and that belonging to model B is depicted in blue.