One way of obtaining a good feel for the 3D structure of sample data is to volume render the data at a high resolution, and then animate the data by rotating it 360 degrees, saving each image and then constructing an SGI movie.
Smooth animation is critical for following the complex geometry of the data.
It is the motion that is responsible for the 3D look and feel of the data. The rendering can be run in batch over night. These movies are typically about 100MB large. To play them back, use the SGI utility movieplayer.