How to enable Light Propagation Volumes GI [ WIP AND BETA]

[Chris.R]

@CharlestonS;3580

Yeah, doesn’t work for me either after following the steps given

The file i edited is E:\Program Files\Unreal Engine\4.0\Engine\Config\ConsoleVariables.ini

I added the variable r.LightPropagationVolume=1 after [Startup], added a direction light and set it to affect indirect dynamic lighting. My file looked like :

*; ConsoleVariables.ini
;
; file allows to set console variables on engine startup (In undefined order).
; Console variables also can be set in engine ini files (e.g. BaseEngine.ini, DefaultEngine.ini) in the [SystemSettings] section.
; file should be in the source control database (for the comments and to know where to find it)
; but kept empty from variables.
; A developer can change it locally to save time not having to type repetitive
; console variable settings. The variables need to be in the section called [Startup].
; Later on we might have multiple named sections referenced by the section name.
; would allow platform specific or level specific overrides.
; The name comparison is not case sensitive and if the variable doesn’t exists it’s silently ignored.
;
; Example file content:
;
; [Startup]
r.LightPropagationVolume=1
; FogDensity = 0.9
; ImageGrain = 0.5
; FreezeAtPosition = 2819.5520 416.2633 75.1500 65378 -25879 0

[Startup]

; Uncomment to get detailed logs on shader compiles and the opportunity to retry on errors
;r.ShaderDevelopmentMode=1*

Put it there:

*; Example file content:
;
; [Startup] <- The Bad One
; FogDensity = 0.9
; ImageGrain = 0.5
; FreezeAtPosition = 2819.5520 416.2633 75.1500 65378 -25879 0

[Startup] <- The Good One

; Uncomment to get detailed logs on shader compiles and the opportunity to retry on errors
;r.ShaderDevelopmentMode=1
r.LightPropagationVolume=1 *

[Daedalus51]

Hahaha…now it works!

In my noobish behavior I put it in D:\Program Files\Unreal Engine\Launcher\Engine\Config instead of Program Files\Unreal Engine\4.0\Engine\Config\

Man how stupid xD Works like a charm now^^

[Daedalus51]

Hmmm…sadly they seem to only accept light from the directional light (like in CE3) even if all light types have the option to contribute to an LPV. Hope will change in the future since gi from lamps etc. would be very much appreciated^^

[anonymous_user_e0b29deb]

@;3636

Hmmm…sadly they seem to only accept light from the directional light (like in CE3) even if all light types have the option to contribute to an LPV. Hope will change in the future since gi from lamps etc. would be very much appreciated^^

That would be . But CryEngine GI offers great possibilities too.
Better use simple GI than an overpowered and hellish slow/performance-sucking GI

[Daedalus51]

@;3724

That would be . But CryEngine GI offers great possibilities too.
Better use simple GI than an overpowered and hellish slow/performance-sucking GI

Yeah…I have to admitt that I am a little bit spoiled, because we had an Enlighten integration for UE4 at the office which was pretty , but we still decided to drop it because it needed too much mainenance. Enlighten was able to have gi from everything during runtime, but you still needed to precompute static for lightinteraction.

I am really hoping we will get realtime gi without precompute (so just drag and drop stuff in and it works^^) for all lightsources generation. I love fast iteration times

Also, I saw a tread in the suggestions to epic section where people ask for a reimplementation of voxel lighting for high end users…that would be

[anonymous_user_48d0c7fc1 (anonymous_user_48d0c7fc)]

@vblanco;3515

LPV DOES use compute shaders, the problem is that compute shaders only exist on DirectX 11 and OpenGL 4.3, wich apple doesnt support at moment, so you are out of luck. The compute shaders seem to be abstracted, so im not sure if UE4 does that in opengl, but the other platform we can test at moment for opengl is apple, and apple, doesnt support compute shaders yet.

…Which is more or less what I said RE: OpenGL and compute shaders. Technically you could test under Windows as well for GL 4.3. I’m kinda curious now if UE4 uses anything with compute shaders that wouldn’t otherwise work with OpenCL within the context of Apple’s API.

[CharlestonS]

Yeah, i tried it there as well but when i place a directional light and set up the properties it’s shadows have preview tiled across them until i do a rebuild even though i have static lighting disabled, i also don’t see the GI effect working…

I have a modern video card in SLI with all the latest drivers on Windows 7

@Chris.R;3583

Put it there:

*; Example file content:
;
; [Startup] <- The Bad One
; FogDensity = 0.9
; ImageGrain = 0.5
; FreezeAtPosition = 2819.5520 416.2633 75.1500 65378 -25879 0

[Startup] <- The Good One

; Uncomment to get detailed logs on shader compiles and the opportunity to retry on errors
;r.ShaderDevelopmentMode=1
r.LightPropagationVolume=1 *

[vblanco]

Bump for visibility, Working on a WIKI page with photos and step by step proper instructions.

[anonymous_user_64593dc8]

Bump for visibility, Working on a WIKI page with photos and step by step proper instructions.
[/QUOTE]

! I’m really interested in LPV

[vblanco]

A new, community-hosted Unreal Engine Wiki - Announcements and Releases - Unreal Engine Forums There you have your wiki page. If someone knows how to make it better, feel free to add pictures or fix the formatting.
Also, i have no idea how to add that page to tutorials category, never edited a wiki, so help me with that please.
edit: nevermind, found how to add it to tutorials list.

[Sitrec]

is great! Thanks vblanco.

[CharlestonS]

So it seams to work now, sort of

I still get Preview text tiled across my shadows until i hit rebuild which ind of defeats the purpose…

Anyone know how to fix ?

[darthviper107]

If your shadows have Preview written on them that means you need to change your light type to Movable (dynamic only) light type.

[CharlestonS]

Perfect, that fixed it!

vblanco - You may want to add to your tutorial and wiki, under the Light Details expand **Transform **and change **Mobility **to Movable

@;5755

If your shadows have Preview written on them that means you need to change your light type to Movable (dynamic only) light type.

[Chris.R]

@vblanco;5496

A new, community-hosted Unreal Engine Wiki - Announcements - Epic Developer Community Forums There you have your wiki page. If someone knows how to make it better, feel free to add pictures or fix the formatting.

As you command
Rewritten and Formatted to Wiki standards

[vblanco]

@Chris.R;5886

As you command
Rewritten and Formatted to Wiki standards

WORK, absolutely amazing. Now its a very nice page for the community. Thanks a lot for your help

[Chris.R]

@vblanco;5892

WORK, absolutely amazing. Now its a very nice page for the community. Thanks a lot for your help

You’re welcome.
I’ve also added a simple level that contains a Cornell Box, way people can experiment a bit better with LPV’s.

Here’s the wiki File Link https://d26ilriwvtzlb.cloudfront.net/2/21/CornellBoxUE4.zip

HF with it.

[BrUnO_XaVIeR]

!

[CharlestonS]

Great, thanks for !

[anonymous_user_099b55a2]

only shows how advanced Cryengine is, they’ve got tech for years
2014 and UE4 is not yet ready to have GI:p