What in the actual mind fuck. Solving the rendering equation using FFT. First this guy invents Radiance Cascades now this? Holy crap...

Yaazarai When he says this is he using a FDTD solver or something else?

I would imagine the step size would have to be minuscule to solve light waves this way…

rain No idea he hasn't elaborated on the subject yet. But has made progress in solving occlusion/shadows better.

Yaazarai Ah, I’m curious because it *looks* like work I’ve done in acoustics, but that would be totally impossible if scaled to the wavelength of light.

It seems he may have some kind of optimization that would be really useful to audio engineers 🙃

rain I didn't even consider that. Would definitely help. He claims that his CPU implementation can render a 4096x4096 image in a few seconds.

Thats actually mind boglingly fast.

Yaazarai Ah, that might be a fdtd solver then, if it’s threaded I could see that being the case for one light source (on a beefy cpu)