Ability to regulate the speed of light emiting

[AnonySharma]

Is there any way to regulate the speed of rays hitting the surface?

[ricktu288]

What do you mean by "regulate"?

[anonysharma-work]

I meant, the moment we turn ON the beam of rays in a closed surface, we see it suddenly fills up the container. I was asking if we can change the speed of light being emitted so that, we could see it bouncing off the mirrors one by one.

[ricktu288]

Currently there is a very hacky way to achieve this by using a GRIN-glass with constant refractive index 1 and very small numerical step size (just to slow down the processing).

Example

However, this only works for reflections and not refraction, since the latter will involve different speed of light which is not simulated by the constant-step-size nature of the numerical solver.