Earlier I was thinking that each frame, a random pixel of an advancing wavefront would be selected, and if it happened to 1) not interfere with itself and 2) run into a solid object (whatever *that* means), the entire wave is removed and the light is reflected from the new point. But the notion of "advancing wavefront" is a bit debatable, since the troughs also form their own wavefront. So they would need to have the same randomly selected pixel chosen in order for interference to occur. But by extension, this means that each emitting electron must pick the same random pixel for the duration of emission (which I thought to be constant for the life of the electron).

Is it just that each electron is assigned a random id at birth, and this somehow indexes the emitted points of the wave (maybe with a modulo over the number of points at a given distance)?