The Heidelberg ray tracing model
Hans‐Peter Meinzer, Kirsten Meetz, D. Scheppelmann, Uwe Engelmann, Hans Jürgen Baur · IEEE Computer Graphics and Applications · 1991
The Heidelberg ray tracing model, developed especially for visualization of medical images, is based on a global illumination model and contains a number of application-specific assumptions. It simulates the projection of a scene with well-defined lighting. A detailed description of the model follows an overview of existing and competing illumination procedures.>