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Illustrations play a major role in the education process. Whether used to teach a surgical or radiologic proce- dure, to illustrate normal or aberrant anatomy, or to ex- plain the functioning of a technical device, illustration significantly impacts learning. Although many speci- men are readily available as volumetric data sets, par- ticularly in medicine, illustrations are commonly pro- duced manually as static images in a time-consuming process. Our goal is to create a fully dynamic three- dimensional illustration environment which directly op- erates on volume data. Single images have the aesthetic appeal of traditional illustrations, but can be interac- tively altered and explored. In this paper we present methods to realize such a system which combines artis- tic visual styles and expressive visualization techniques . We introduce a novel concept for direct multi-object volume visualization which allows to control the appear- ance of inter-penetrating objects via two-dimensional transfer functions. Furthermore, a unifying approach to efficiently integrate many non-photorealistic render- ing models is presented. We discuss several illustrative concepts which can be realized by combining cutaways, ghosting, and selective deformation. Finally, we also propose a simple interface to specify objects of inter-

VolumeShop: An Interactive System for Direct Volume Illustration