Make the speed of the particle dependent on the refractive index of the medium

[yakir12]

Since you time everything we should add this to the mix. While it's usually not crucial to propagate rays up to a certain point in time (but instead propagate them up to a certain point in space), since you already do that, we might as well affect the speed dependent on the refractive index of the medium (and obstacles). This would be good down the line if and when we want to include diffraction.

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[Datseris]

This is not possible to happen, unfortunately. One has to find a smarter workaround that doesn't change the velocity.

Literally everything in DynamicalBilliards assumes that the velocity measure is exactly 1. This can't be changed as one would have to re-write pretty much the entire collision, propagation methods and probably much more.

[Datseris]

Ah but wait. Wait wait,

yes this can be done if you implement this Phonon particle. Of course a lot of new code would have to be written, but then it is possible. It is not possible for the existing Particle.

[Datseris]

There is a much smarter way to do this. Once you open the Photon issue I will write the code that showcases how easy this is.