Ray Tracing

Goddamn all of these homework threads. Let's talk about something interesting.

I'm starting work on a ray-tracer for shits, /proggles/ Any tips on speed improvements? It's being written in C.
I know the show stopper (usually) is having to check each element in the scene and see if it has been intersected by a casted ray. Any ideas on improvements in that area?

>>39
You stop after 212 unless you go on to take 405.  Or you go back in time and take the C version of 215.  Though back then you were also expected to make nice shit with your ray tracer.  Like those pictures at the front of the beginning.  Or the one with the wanted poster of Westall in the faculty lounge.

Anyway I prefer to remain ANONYMOUS AS FUCK and as such not revealing who I am.  Though if you did know who I am then you could probably guess it.