We have implemented a simple editor that allows students to intuitively explore the volumetric data, as shown in Fig. 5. This editor is composed of a curve that the user can modify with his finger in real time to identify interesting parts of the mode. The curve is used to map a color and a transparency value (horizontal axis) to each grey tone of the original image (vertical axis). Fig. 5 shows the same model rendered with two different TFs. We clearly see that the TF can be designed to just visualize the skin, the bones, or even both at the same time.