Interference phenomena of light often appear in daily live as, for example, the colorful reflection of oil spills and soap bubbles, the discoloration of tarnished silver and color banding in heat-treated steel. Natively, Blender does not support the rendering of these kind of phenomena.

However, with some approximations, very good results can be obtained that mimic real life to a great level, using dedicated node groups. This presentation briefly touches upon the physics involved, moves on to the implementation and its limitations, but also has ample time for showcasing the possibilities. A library of materials that is free to use for any purpose is available for download here: https://blenderartists.org/t/update-v1-…