Retro Reflecting Surface Editor

With Retro Reflecting Surface Editor, you can assume that the ray may be reflected towards the direction it comes from.

Note: This surface is useful to simulate reflector such as those installed on back of cars, bicycles... Indeed some surfaces as cars reflectors reflect a part of the incident light in the direction of the source. A part of the light is reflected following Descartes' laws and another part is reflected in the direction of the light. Both reflections are defined by a specular ray for one part and a Gaussian diffusion for the other part.