Question Having trouble reaching decent quality with Raytraced GI

Just did a quick little test of raytraced GI.

My setup:

• 2020.1b2
• HDRP 8.0.1
• using an RTX 2060

The only way to get the light bounces from to floor to get to the ceiling is to set the "Ray Length" to its max value. But the results are very noisy, even with the two denoisers activated, and even if I switch to "Quality" mode. I tried tweaking every other setting I could find, but no success so far

Moreover, when objects move, there is some extremely visible ghosting that happens behind the object


And finally, the max possible Ray Length for raytraced reflections seems to be insufficient for this type of scene:

• Do you have any tips for solving these issues?
• Otherwise; can we expect huge visual improvements in upcoming releases, or is that representative of what realtime raytraced GI will be like for the near future?

 

You want to be in Quality mode for the best results for both Reflections and GI

 

tried it, but there's barely any difference in noise amount. The only difference is when I set the Sample Count to something like 5, but then I go down to 20 fps on my pretty good PC

However, I did reduce the size of my test scene, which was way too large. The cube in the middle of the room here is 1x1x1. Now my rays can reach everywhere


And the movement noise is still an issue as well

 

It Unity's raytraced GI using RTXGI under the hood? I see Unity's SpaceShip demo being used as a demo scene on Nvidia's website so I'm guessing its integration is in the works?

 

That's from an early version of a Realtime GI implementation (DDGI) that Unity did a few months back.
You can watch a talk on it here if you'd like.

 

Depending on your card you might not be able to get rid of the noise in GI for attracting. I'm using a GTX 1080 and I get about the same amount of noise. I would expect an RTX 2060 to be a fair bit better but it's looking almost the same.

 

I have a 1660 Ti (so, no RTX cores) and a friend who has a proper RTX card and he reports pretty much identical performance in a test project where I'm using ray tracing. Seems to indicate to me that, at least in HDRP 8.X, RTX cards aren't being utilized... period. Or the CPU usage is so high that it doesn't matter. HDRP 10.X apparently runs better, but irritatingly there's no easy way to upgrade to it. You have to pull it from github and that's annoying.

There's another thing worth pointing out here - yes, the GI in 8.X is unusable for untextured objects because the denoiser is absolutely terrible and that noise is extremely apparent on a completely even surface. However, it looks a lot nicer when using finished/textured assets, as the textures can hide the GI noise a lot. So, a huge factor in your test scene not looking good is because your assets aren't textured so now you can make out every little imperfection in the GI.

 

For the first time, with 2020.2 + HDRP 10, I have now the sample scene running at 30 FPS steady on a RTX 2060, with raytracing and directional + spot light raytraced shadows.

This is actually going somewhere

I hope it keeps getting better like this as it may end up being suitable for next gen.

 

Did you have to do something special for spot lights? I can get point lights working and causing shadows, but not spot lights. Am using RTX2080. Been using Unity for several years and follows ray tracing guides pretty closely but can't work out what I've done wrong