The Detector Volume object in ZEMAX is a very useful tool for detecting light inside a volume. It uses volume pixels, or voxels, to detect light. However, the ZEMAX interface currently allows these voxels to be viewed only in 2-D planes. This article will show you how to use ZEMAX to create intricate CAD models of the voxels in a Detector Volume, and a sample ZPL macro is given at the end of this article for use in creating these CAD models automatically.