1. A method for automatically setting a rendering parameter for a virtual endoscope for rendering images for virtual endoscopy, comprising the steps of: deriving a data set corresponding to an inside view of a viewing frustum of said endoscope; calculating a histogram from said data set; correlating features of said histogram with known physical regions wherein said endoscope is situated; and selecting a transfer function positioned relative to said features of said histogram for providing image differentiation between respective rendered images of said physical regions in said images.