Realtime Dynamic GI + Reflections + AO + Emissive - AHR

[RyanTorant]

@Frenetic Pony;374016

Considering there’s a limited trace distance I’m picturing some very odd energy variance, where corners get tons of bounces and are fantastically overly bright while isolated areas are far too dark. So far as I know unlimited bounce hack, while it sounds good on paper, isn’t actually used as such for the most part. But maybe what’s in my head is just wrong.

Either way, the main problem I can see is the temporal trailing. If the idea is that it’s dynamic and moveable you’ll get really odd looking temporal instability, where light kind of follows really slowly to “catch up” to the scene updates. It could be a neat specific art effect, kind of reminds me of the Discworld novels and how light is supposed to be “slow” there. But it will probably be unwanted. And looking at the linked thread, yeah the artifact I mentioned of odd energy variance is very much present there. The super bright areas near the light and dead darkness where it’s too far away, doesn’t look as bad as I’d thought though.

The thing is that you normally give a smaller weight, like 0.5 to the prev one, so you get something more similar to a moving average. Also remember that light looses energy on each bounce, so even if you have a lot of bounces contribution is quite small after 3 or 4. You do have a point with the limited range thing, but don’t think it’ll be much noticeable. Guess I need to try and see.
Tbh, temporal trailing shouldn’t be that bad, did a few tests a while back and actually looked better, as it smoothed Voxel changes.

EDIT: also is what NVIDIA is using to bring multiple bounces in vxgi if I remember correctly