.com/EpicGames/UnrealEngine/releases/tag/4.22.0-preview-4
It seems as though the latest preview build broke dynamic raytraced skylights? Or was that feature intentionally removed? Or am I missing something?
Edit, I should specify: Traced Shadows from the skylight seem to be missing, even with the new “Cast Raytracing Shadow” checkbox on skylight.
Im also wondering the same thing
Epic is not making RTX chips. Why banned? Waiting for AMD cards support in UE4.
About Preview 5 … there are all bad, really bad. Not even skylight makes overbright and BP_skysphere gives black. After datasmith import UE4 crashes and after restart editor wrote there are no objects (object dummies are in scene) here.
Back to preview 4. Or looking to Cryengine. 
That CryEngine video says only reflections, no shadows. Also, the video is in 4k, but there is no clue which was the framerate when that was shot, since all you need to be real time and to shot a movie is 30 FPS. Will that work on consoles?
I like the new barn doors of the rectangular lights in 4.22 p5. Gives a lot more control in tight lightning situations.
test: r.GlobalIllumination.Denoiser.HistoryConvolution.SampleCount 1
After updating to P5, I can’t build lights anymore for some levels. All light map res are on power of 2.
Cool, it fixed the dark reflections and sky problem.
This needs to be a sticky or highlighted cause it automatically fixes the black sky issue.
What am I doing wrong?
Built-in live++ is really slow i think. Previously, I used live++ as a separate plugin and the build takes 1-3 seconds.
Now 15-20 seconds… but using only UBT build takes 10-15 seconds
UE 4.22.p5
The plugin doesn’t run UHT. I guess that’s why it’s way faster.
Hopefully they aren’t trying to do the object reinstancing nonsense again, I would much rather have a fast hot reload with clearly known limitations than a slow one which magically breaks blueprints sometimes…
Looks like preview 5 loves studiolight blueprint with this little fix. Simple skylight and directlight make scene dark. Adding hdri to skylight drop down FPS and sometimes crashed.
With that fps is better. You must add postprocess and play with raytracing parameters there. I use 1 bounce for GI and 3 samples per pixel.
worked like a charm, you rule man.
Anyone have any luck with translucency? or is this still not working yet?
I had to remove the glass to get light in. Everything else is looking good so far though.
Does anyone have issue with sphere traces (and other shapes), where they do not hit any objects on scene ?
Nice man, i’m adding this fix to the updates i’m showing to unreal via email for my original submission
For filmmaking I would love to have an easy way for it to rest for 2 seconds before each frame. I have an 8 Gig RTX card and I notice that it takes a split second for the shadow noise to settle down. For offline rendering this would help a Huge Amount…
Bug report has been submitted for this!
So, to anyone that seeks perfection i managed to workaround this issue i was now seeing on objects borders having the SkySphere Material (set to Lit) on background, while also setting “r.Raytracing.Globalillumination.Denoiser 1”.
Just connect the Base Color input of the Skysphere Material as shown in image 2 
EDIT: well it seems that only SOMETIMES it works properly…xD most of the time you will get black artifacts all over the sky…hopefully we will get proper results using raytracing upon engine release