The state of Distance Field GI in 4.8

nkey · September 3, 2015, 7:50am

Could anyone update to 4.9 state?

anonymous_user_1ffa804e · September 16, 2015, 10:47pm

Probably the best alternative for GI ever. Will this work for light source other than Directional Light?

John_Alcatraz · September 23, 2015, 1:06am

I have just tested it with my new GPU (R9 390) in 4.9.1 and DFAO is 2ms now while HFGI is 16ms.

I have set these values in the ConsoleCommands.ini:

r.DistanceFieldGI=1
r.HeightfieldGlobalIllumination=1
r.VPLMeshGlobalIllumination=0

2ms for DFAO is nice, but 16ms for HFGI seems to be a lot…

XilenceX · September 23, 2015, 1:45am

It’s sooo sad that dynamic GI isn’t a priority for Epic. I think more and more modern games will use fully dynamic lighting, not less of them. So it’s a strange decision.
The focus on improving performance is a really good decision though!!! Especially if some of it happens to be improving dynamic lighting / shadows performance.

anonymous_user_f2b8b290 · September 23, 2015, 5:59pm

John, HFGI performance has regressed in 4.9. We dropped the adaptive sampling for DFAO + HFGI but then only optimized DFAO through the global distance field, so HFGI ends up being slower. Hopefully we’ll get a chance to revisit and make HFGI work nicely soon.

Note that you can always go back to the 4.8 method with ‘r.AOUseSurfaceCache 1’

MagicNono · October 1, 2015, 8:06am

Hi,
Is DFGI available on OSX el capitan ?

elliotENGi · October 12, 2015, 4:55am

Only DX11 (windows) and PS4 is supported currently.

Kalman11 · October 12, 2015, 8:25pm

Just a quick question:
Can I turn it on and off via console commands (to make it toggleable in a settings menu)?

anonymous_user_92cd4149 · October 15, 2015, 8:04am

Do anyone use it in official 4.9 engine version?
I tried to get it working but without success
I am also tried to get master build from git(4.11) does not work anyway

And for some reason it work perfect on 4.8.1

Pumpy_Bird · October 15, 2015, 1:44pm

Can you use dfao on static meshes with a material that moves the vertices such as a tree swaying in the wind?

Kalman11 · October 15, 2015, 5:40pm

Bump
I need some help
I know the console command is r.DistanceFieldGI 0 or 1, but it doesn’t do anything, if I expand the console, it says it’s read-only

Pumpy_Bird · October 16, 2015, 12:07am

Nevermind, I just needed to RTFM.

anonymous_user_b65ae2a21 · October 23, 2015, 1:29am

What is the current state of this in 4.10? Did the HFGI manage to get revisited for it to be usable again without having to give up the DFAO optimizations?
And I was wondering, does the DFGI effect landscape without HFGI on? And if it does, is HFGI something we need in open environments at all due to all the bounce color and lighting coming from foliage and other objects?

Also, is this currently better quality and performance wise than NVIDIA’s VGXI?

Maximum-Dev · October 25, 2015, 10:33am

Hello,

With DFGI I’m getting some black line artifacts as you see in the visualizer. Is this common for everyone?

Maximum-Dev · October 28, 2015, 12:17pm

Bump.Bump.

anonymous_user_b65ae2a21 · October 29, 2015, 9:11am

Why is this thread so dead, shouldn’t this be like the new exciting thing for the engine?

anonymous_user_c94f194d · October 29, 2015, 9:25am

Because it’s currently on hold. is doing optimization work and not having time to work with this.

jonimake · October 29, 2015, 9:58am

anonymous_user_b65ae2a21 · October 30, 2015, 5:27pm

Then what direction is dynamic GI going?

_cDub · October 30, 2015, 6:32pm

Check out the AHR branch.