Unreal Engine 4.23 Preview

Excellent update! For my project this is working great. Compared to 4.22, performance is up at least a little bit in some cases. GI Denoiser performance and quality seems much better. In 4.22 I couldn’t run the sample rate at 100% because the noise pattern took a second or so to catch up in fast movement (especially when one object occluded another and you turn the camera fast), now it’s much closer to realtime. Not quite instant, but 100% sampling rate is possible. I defaulted to a 25% sampling rate in part to mitigate that issue, now I think I may want to change my defaults for a 4.23 build. I’m seeing pretty decent results with a 100% sampling, 1 bounce and 1 sample. 2 bounces look better, but the performance impact is probably too high for most gamers.

I can’t quite tell what’s going on from looking at it yet but quality seems better compared to 4.22. This is exactly what I would’ve hoped for, not expecting perfection with RTGI I know there are serious engineering challenges to get this right. But steps in the right direction is fantastic and very welcome. I realize that its going to take a while to get all of the ray tracing features working the way everyone wants it to.

Also my release build size has come down 200MB from preview 7 to preview 8. Exact same content (2.8GB vs 2.6GB on disk).