Unreal Engine 5, [UE5 Developer Availability 2022-04-05]
- Thread starter mpg1
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From the artstation
https://www.artstation.com/artwork/rRx8aG
It runs better now than he has a 3090. This is using some of the UE 5 demo assets but with classic method with low poly models and normal maps generated from the LOD0 UE 5 assets. And he replaced Lumen with raytracing.
He is senior environment/lighting artist at The Initiative.
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https://docs.unrealengine.com/en-US/RenderingAndGraphics/index.html
He uses this, lighting is probably superior in UE 4 but Lumen is a great compromise and normal maps can't cast shadows. The problem of the UE4 version is the missing geometry not the lighting. The Ue 5 demo with raytracing would look even better but Lumen is a great compromise.
Because people needs to understand only geometry cast shadows. He used the same assets but he use low polygons and normal maps. You don't need to be as extreme as Unreal Engine 5 but a game like Demon's souls Remake have tons of polygons because if you want object to cast shadows you needs polygons.
Offline Path tracing would not resolve the UE 4 scene, much more polygons need to be there.
The shadowed regions are way too dark in UE4. GI is clearly inferior.
This is a problem too.
EDIT: less shocking on the video
I know in Ue 5, they do some sort of denoising system on shadows maps to make them looks more soft on the edge.
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It looks like RT lighting has only one bounce (or two), while Lumen has infinite bounces.
It is maybe coming from the UE 4 global illumination implementation. And there is too much less details, with less shadows.
Major drawback, much larger than some light leaking issues in the UE5 demo.
https://news.developer.nvidia.com/nvidia-rtxgi-1-1-with-unreal-engine-4-support/
He did the scene in May 2020 and RTXGI UE4 plugin was only available in September 2020. This is maybe the problem if he did not rerender and use the plugin now.
D
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From the interview:
Hopefully this will put down those ludicrous claims of the UE5 demo running in a windows laptop with a mobile geforce RTX because someone played a video of the demo during some livestream in China.
It seems parrallax occlusion works with raytracing but it has some problem too. But is is probably better than normal maps.
https://forums.unrealengine.com/dev...g-w-parallax-occlusion-and-pixel-depth-offset
https://forums.unrealengine.com/dev...g-w-parallax-occlusion-and-pixel-depth-offset
The difference in lighting is very big, also if we try to ignore geometry. Some screenshots look like direct lighting with constant ambient. No idea what he's using and how hard he worked on tuning, but i assume RTX GI could look better.
Interestingly, the difference geometry makes is less about details, but mostly about feeling more seamless with consistent resolutions than the other, where you can see which model is which. But this also implies a purpose of doing some programmer art to test something out. It's just not polished, other than having some nice assets.
With more time on this, he could do better, He did it in 11 days in his time off job and another problem the original assets were made for the UE5 demo. But from my point of view, the UE4 demo reminds me of an old gen games(PS4/XB1) and it would be the same with infinite bounce just better shadows.
Why? That's a completely unwarranted conclusion. Throughout the piece we never hear any mention that the PS5 specific IO implementation is what has enabled that demo. All he mentions, even in the parts that you've bolded above is that you need an SSD, as opposed to an HDD to enable the instant seek times and of course higher bandwidth demanded by Nanite for geometry streaming.
Even your description of the claim above is completely wrong. No one claimed the demo was running on the laptop in that live stream. Only that during the stream, the engineer specifically stated that the demo also ran on a mobile RTX2080 GPU in his laptop that was also running a middle of the road NVMe SSD:
The same engineer also specifically states that the SSD requirements aren't that high, and any decent SSD should be able to handle the demo. Furthermore, the actual CTO of EPIC Games confirmed the demo would run on a well speced PC and while that's only paraphrasing his comments from a conference call, I'm pretty sure DF who were also on the call confirmed the comments here on this forum.
https://www.windowscentral.com/geforce-rtx-2070-super-and-ssd-can-run-unreal-engine-5-demo-pc
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