MIS 128spp, 0:48 render time. Its a bit more noticeably noisy, but it looks okay overall.

MIS with 1024 spp, 6:35 render time. There are some small things wrong with it, but it looks good enough IMO and its not worth spending any more time on top of the boatload I have already invested. Ill come back and fix it if I have time this week, but thats pretty doubtful.

BRDF sampling w/ 8192 spp. Took 34:21 to render probably because I had a bunch of debugging stuff still left in my code.

Just fixed BRDF sampling with 512 samples. Took like a minute I believe

Same render/code as before, just with some more iterations.

No next event estimation yet. Progressive rendering working seemingly though!