Lightmass: multi-bounced sky lighting

[Sherffi]

@expungeme

Ok so here is an apples to apples comparison of ****** Mod **and the 4.18 preview.
Skylight only, using an HDRI and 15 light bounces. Static lighting scale of 0.1
ini was modified on both : NumShadowRaysScale=**16 , **NumPenumbraShadowRaysScale=**64 , **NumHemisphereSamplesScale=**32

Mod**: 3 h build time

[ATTACH=JSON]{“data-align”:“none”,“data-size”:“full”,“data-tempid”:“temp_118170_1506353875475_534”}[/ATTACH]

**4.18 preview ** : 1.5 h build time

[ATTACH=JSON]{“data-align”:“none”,“data-size”:“full”,“data-tempid”:“temp_118171_1506353894334_254”}[/ATTACH]

's build is much faster, but I feel that 's modded version looks a bit nicer. There is a big difference in brightness although I imagine that Daniels build might play better with sun lighting.

P.S Thank you for your contribution.

ר
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You use those settings with production high or medium quality ?

Thanks!

[Wyatt_Grit]

@eylon2000

ר
​​​​
You use those settings with production high or medium quality ?

Thanks!

Full settings described for that scene in #260

[Robbie222]

Hey guys,

First of all I would like to thank you and congratulate you for your awesome job on pushing UE’s lightmass further.

I am facing a dilemma : the project I am working on has a deadline next week. So UE4.18 full release + substance plugin update probably won’t be in time. Is it possible to use 4.18’s Lightmass on 4.17? Or is there some trick to make substance plugin on 4.18?

[ZacD]

Just use the bounced lighting exe in this thread for 4.17. You’re not going to get all the 4.18 improvements, but it’s better than nothing.

[ZacD]

The livestream talked about the new lightmass features here 4.18 Preview | Feature Highlight | Unreal Engine Livestream - YouTube

sounds like doors and other moveable objects will be much better integrated.

[DaBoss]

Hi everyone
I’m on 4.18 preview and i can’t achieved what u guys have. I tried to lit my scene with only HDRI but it seems to dark. Is it normal? Or do i need to add point lights?
My setting are in attachment.
Thank you for your help

[amoser]

You should be able to get enough light from that giant window. It looks to me like either your materials are too dark to reflect an adequate amount of light (meaning most of the light will be lost at each bounce), or your lightmass importance volume isn’t actually surrounding the area of interest.

[ZacD]

Or your auto-exposure settings aren’t ideal for your scene.

[Wyatt_Grit]

Yea like ZacD said, definitely an exposure issue. Try playing with the exposure bias (with an unbound post processing volume of course).

[DaBoss]

Thanks a lot guys for your help. Like ZacD said it was my auto-exposure. Save me a headache.

[anonymous_user_586cbc0b]

I haven’t figured out a workaround yet =( Something like VisibilityTangentOffsetSampleRadiusScale or VisibilityNormalOffsetDistance is probably relevant but I didn’t get time to play with it before I had to switch to a higher priority task.

The brighter the 2nd and up bounce of skylight is, the more severe the artifact. Scenes with very bright diffuse (.7 and above) with 90 degree corners have it the worst. Adding a bevel may work around it.

Yea ,

Adjusting the
VisibilityTangentOffsetSampleRadiusScale from 0.8 to 0.001 and
VisibilityNormalOffsetSampleRadiusScale from 0.5 to 3
I managed to eliminated almost all the dark edges on a huge internal archviz scene.

Thanks for the hint!

[anonymous_user_cb9ec8a0]

@rafareis123

I did a comparison between 4.17 and 4.18 version. I have noticed a strong black shadow on the corners and intersections.

welcome back Raf

actually wich settings do you use on 4.17?
ini and world

[anonymous_user_78daa01b]

and , you guys did a great job improving the skylight in 4.18, something we desperately needed! Would be absolutely great if you could address that dark corners issue, it’s really noticeable in certain situations. Other than that multibounce skylight is fantastic, thanks!

[AAriyAA]

Hi guys. there is any connection between num indirect Lighting bounces and Num Sky Lighting Bounces? i mean when you pute Num indirect Lighting Bounces to 0 skylight multi bounces will work?
its seems when you pute num indirect Lighting bounces to 0 skylight bounces will stop to working .( i mean when skylight is your only light source )
and i want to know there is a connection between roughness object and bounces? i mean an object with specular to 1 and roughness to 0 will have more bounces light?! ( i test it and its seems roughness of objects is not effect to bounces )

[rafareis123]

@coach

welcome back Raf

actually wich settings do you use on 4.17?
ini and world

Nothing special. I achieved pretty good results with hight quality preset settings

Here are some tests in 4.18.
The indirect lighting spreads beautiful. The settings I have used:

Static Lighting Level Scale = 0.15
Num Indirect Lighting Bounces = 7
Num Sky Lighting Bounces = 7

[anonymous_user_15cad3d6]

It is connected to Num indirect lighting bounces in world settings.

[anonymous_user_cb9ec8a0]

@rafareis123

Nothing special. I achieved pretty good results with hight quality preset settings

Here are some tests in 4.18.
The indirect lighting spreads beautiful. The settings I have used:

Static Lighting Level Scale = 0.15
Num Indirect Lighting Bounces = 7
Num Sky Lighting Bounces = 7

hi man

i try your settings on “lightmass” scene. i have nice result with very fast building. but i get that error in

i get that errors:

1. typical 4.18 shadows in the corners
2. bounces on wall far from sourse light

how can i resolve for you? wich parameter have i to change to get off that bounces on wall?

[Bladerskb]

Does this still work if you un-check lower hemisphere is black. As that is supposed to give you an extra bounce am i correct?

[Farshid]

hi all
my point lights have low resolution { 4.18 preview 4 }
how can i solve it ?

[salvatoreparigi]

Hi guys, I have installed the UnrealLighting Mass in UE4 4.18 but it doesn’t work.
Give to me this error

Entry point not found.
What I have to do to fix it?
Thanks