Did you ever think you would see the day when you could have Ray Tracing on an SNES? Well, thanks to an engineer by the name of Ben Carter, that day is here. Man, what a time to be alive!
According to a blog post by Carter, he's been working on the SuperRT chip for about a year, using a completely unmodified Super Famicom and a ton of wires. This is a hobby project and not associated with Nintendo in any way, but it would be so cool if this was available to the public one day.
He breaks down how it works in his blog with this particular tidbit saying "The SuperRT chip constructs the scene using a specialized command language which is executed by one of three parallel execution units on the chip - essentially specialized CISC processors - to perform ray intersection tests." He goes into incredible detail on the fascinating process and it is definitely worth the read.