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.