I'm currently working on a physics-based puzzle game with light refraction. I've read about the reflection/refraction incidence ratio, and how it's the proportion of the sine values of the angle of incidences.
However, what formula, if there are any, determines the threshold for % of light reflected and % of light refracted?
is the % of light reflected/refracted always either 0% or 100% (that is, they're always either reflected or refracted)? Or is there a curve of some sort for this?