How to improve software Lumen GI

[[Ғ.Ø.Σ.] | w4cht3l]

In Digital Foundry‘s analysis they pointed out that the software Lumen for reflections is bettet on PC than on PS5.

But for whatever reason the software Lumen global illumination isn‘t. Software Lumen GI on PC is a match for PS5 performance mode but worse than PS5 quality mode and there is no game setting to change that. The game seems to use UE5‘s „high“ setting by default and not the „epic“ setting.

Any way to change that? Don‘t want to tank my FPS by enabling RT with hardware Lumen, but I would have enough headroom to get the best out of software Lumen.

[Racists]

Where did you get that from that it's worse than the PS5 quaility mode?

[PRAET0R1AN™]

Lumen is software driven for most of the visual effects for the GI, shadows and the "standard" reflections that aren't as accurate.

Hardware lumen is used for the raytraced reflections and that's about it from what I can tell.

There are 2 commands you can add to Engine.ini to improve reflections on shop windows though.

r.lumen.translucencyreflections.frontlayer.allow 1
r.lumen.translucencyreflections.frontlayer.enable 1

[[Ғ.Ø.Σ.] | w4cht3l]

Originally posted by Racists:

Where did you get that from that it's worse than the PS5 quaility mode?

https://youtu.be/B1Et12RgWlQ?si=tBvZL7kdxo81YKUx

Everything is perfectly described between 1:45 and 6:05.

Originally posted by PRAET0R1AN™:

Hardware lumen is used for the raytraced reflections and that's about it from what I can tell.

That‘s not correct. Turning on RT in the setting will switch from software-based Lumen to hardware-based RT / Lumen for reflections AND diffused GI.

And thanks for the Engine.ini commands, but I don‘t want to enhance the hardware-based RT. I want the software-based GI to be better. Maybe there are commanda for the Engine.ini to do that as well? Can find any when doing a Google search.

[PRAET0R1AN™]

Originally posted by Ғ.Ø.Σ. | w4cht3l:

And thanks for the Engine.ini commands, but I don‘t want to enhance the hardware-based RT. I want the software-based GI to be better. Maybe there are commanda for the Engine.ini to do that as well? Can find any when doing a Google search.

Ya I wasn't too sure on the various RT versions were but that's why I said "from what I can tell"

I did spot a website that listed all of the UE5 commands but idk if they will work on the Engine.ini

https://framedsc.com/GeneralGuides/ue5_commands.htm

Best you can do is search that for anything related to Lumen.

:edit:
r.SSGI.Enable [0 = Off, 1 = On]
r.SSGI.HalfRes [0 = Full, 1 = Half Res]
r.SSGI.Quality [1 = Medium, 2 = High, 3 = Very High, 4 = Ultra]
r.AmbientOcclusion.Method [0 = SSAO, 1 = GTAO]

So you ideally want these set to :
r.SSGI.Enable 1
r.SSGI.HalfRes 0
r.SSGI.Quality 4
r.AmbientOcclusion.Method 1

[[Ғ.Ø.Σ.] | w4cht3l]

Damn, thank you so much