What's wrong with Phong - Designers' appraisal of shading in CAD-systems
The Phong illumination model is still widely used in realtime 3D visualization systems. The aim of this article is to document problems with the Phong illumination model that are encountered by an important professional user group, namely digital designers. This leads to a visual evaluation of Phong illumination, which at least in this condensed form seems still to be missing in the literature. It is hoped that by explicating these flaws, awareness about the limitations and interdependencies of the model will increase, both among fellow users, and among researchers and developers.