Meißner, MichaelBartz, DirkK. Mueller and A. Kaufman2014-01-292014-01-2920013-211-83737-X1727-8376https://doi.org/10.2312/VG/VG01/383-394Virtual endoscopy applications frequently require the visual representation of several material interfaces to show the relevant data feature to the user. This requires the specification of complex transfer function which classify the various materials and color them appropriately. In this paper, we explore the use of the direct volume rendering for virtual endoscopy. We specifically look into the visual representation of different anatomical features of various volume datasets, which are located below the inner surface of the organ of interest. Furthermore, we present how interactivity can be accomplished with the VIZARD II ray casting accelerator board.