Unreal Engine 4.26 New GPU Lightmass Tutorial

[@VRDivision]

If you have a question or need help with Unreal Engine bit.ly/3zSGUBO

[@tech-ii5sh]

What is this form you have listed here that is not available for?

[@JonathanWinbush]

Good stuff as always my man

[@VRDivision]

Thanks brother!

[@Daniel-be6cj]

Really good an in-depth video on this feature!

[@dyotoorion1835]

So happy about GPU Lightmass! :D Thanks for the tutorial. Much appreciated!

[@VRDivision]

Happy to help!

[@sidneyolluyn9832]

Nice video! Btw if you want to bulk switch the lightmap resolution you can type static mesh in the world outliner search field. Then you can easily select all static meshes and switch them!

[@VRDivision]

Thanks for the tip!

[@aphermion]

I just came back to this video to say that I've finally tried it, and it's a game changer. No exaggeration. I'm using it on a RTX 2070 and it's really quick. Like extremely quick. What was an hour before is now a matter of a few minutes. The other side of the coin is that It eats through GPU memory like it's nothing, 8GB of video memory doesn't last long depending on your scene. A RTX 3090 suddenly doesn't seem so overkill anymore, with its heaps of memory.

[@VRDivision]

Thanks a lot for your comment Fox, not to mention that GPU lightmass does look better in Archviz projects! Join our Unreal Engine community to share your work and experiments!

[@robbie_]

I do this (enable RT on 2070 RTX, enabled RHI DX 12), enabled the plugin, but my "Build Lighting" button is still disabled.

[@VRDivision]

I got this multiple times from multiple people, could it be a bug? can you try it on a different project?

[@robbie_]

@@VRDivision I solved the issue in my particular case. I looked in my DefaultEngine.ini file for my project and there were two [/Script/Engine.RendererSettings] sections. The first (encountered first by the parser no doubt) said RT = true, in the second it said RT = false. I deleted the second and it started working. I don't know how it happened. I do crash the editor from time to time so probably some bugletto in there. So the problem was when I enabled RT and restarted, it came back as disabled.

[@CAyou]

with alt+0 you can check if the lightmapping resolution is correct before baking.

[@TheWinterShade]

Am I the only one that can't use GPU lightmass? Everytime i activate gpulightmass, raytracing, directx12 etc, everything completely crashes. Can't open up my projects.

[@VRDivision]

This sucks!! is it happening on every single project?

[@TheWinterShade]

@@VRDivision Yea with every project, sadly 😕

[@celgost2502]

On restart u should be blocked at 45% for a long time and it's expected.

[@beeceelad]

This is amazing, thank you for sharing!

[@VRDivision]

Glad you enjoyed it!

[@itsukishuun]

What's your setup when you recorded this?

[@lucas3d676]

Is it possible that the lightmass implementation prevents the Reflection Capture to work? I get that issue now. No reflection capture works on anything... Do you encountered this problems? I work on 4.26.1 now.

[@VRDivision]

Hi Lukas! That's strange, I honestly didn't understand your question completely, would you please join us on discord and share a screenshot? We can help you there!

[@lucas3d676]

@@VRDivision Thank you for a quick response! Just posted it on discord! TY!

[@peterpui7219]

Love your content!

[@VRDivision]

Thank you Peter! This makes me really happy

[@wilsione]

GPU lightmass works without RTX cards?

[@VRDivision]

Yes sir

[@MrCiarls]

RTX and Nvidia 1000 series only. Not 900 series.

[@mv4770]

Correct me if I'm wrong, but the creator of Luoshuang's GPULightmass actually developed this for Epic.

[@VRDivision]

That's correct

[@dr99tm23]

The way you introduce the videos is amazing , thanks 🙏

[@VRDivision]

Thank you!! I'll do my best to keep it that way))

[@MrMeen]

Enjoying your content man. Question, can we use these GPU bakes for VR? AS I know ray tracing is not supported for VR

[@VRDivision]

Thanks! ^^ Yes, you can bake your lights and still deploy your projects for VR, you could say that ray tracing is used to help baking the scene, hope this helps! let us know if you got any more questions

[@MrMeen]

@@VRDivision Thanks man, have tried it and it works!

[@demetrioruivo9364]

I have 2 GPUs - can I leverage them both in the calculations?

[@VRDivision]

ma man, I would really love to know the answer if you managed to do it!

[@DR-mc7fn]

@@VRDivision That would be awesome wouldn't it? Seems like a simple thing to do, and considering it is a rendering process, it should scale fairly linearly with more GPUs, according to luoshang, but I can't seem to understand why it hasn't been done yet... Looking for answers, too, will chime in if I can find it ;)

[@terrablader]

wasn't the point of raytracing not to bake? I am really confused. Why is baking needed with raytracing on? Is this because some light calculations are not supported in Raytracing?

[@VRDivision]

Baking your projects will make your scene much lighter than using fully dynamic lighting, with the hybrid method "baking lights + raytracing" we get much more realistic results, I hope this helps!

[@qwetry-j2u]

There’s definitely a problem with Stationary Skylight :( I hope they’ll fix that and we’ll be able to use other mobility options for Skylight other than Static.

[@VRDivision]

Hope that too!

[@Particle67]

Awesome!!! Subscribed

[@VRDivision]

Ayyy! Thank you!

[@unityinfusionmedia9102]

Big tutorial mate 👌

[@VRDivision]

Glad you liked it

[@greyisokay2394]

Is it better and faster than luoshuanh's gpu? Cuz im not sure if i should switch to ue one

[@VRDivision]

I might actually consider doing video on that, I think it's faster, but I can't tell unless I do some tests

[@greyisokay2394]

@@VRDivision would be great

[@emar779]

Luoshuang is the guy who is working on this new lightmass in the first place so unless you want to use an older engine version, the new lightmass is the one to stick with, since the new UE4 GPU Lightmass is basically Luoshuang's just officially integrated and worked on now.

[@RakizFarooq]

How much ram on the GPU is required for good quality bakes?

[@VRDivision]

depends on the scale of your project!

[@NabilLOD]

very good wounderful .... yahia i have a big problem with 4.26 ... if you try to open edit mesh to fix any light map res or any thing else it is crashing with me .. can't use 4.26 with this problem .. do you have any information about it ?

[@VRDivision]

are you still facing this issue? could you tag me on Discord if yes

[@danny3man]

So i guess there is no hybrid mode, where you can use both cpu and gpu to calculate the lightmass...

[@VRDivision]

I don't believe it's possible to use both of the CPU and GPU to calculate the lightmass, since each is calculating light and meshes in different ways

[@slothsarecool]

Curious if anyone got emissive materials to work with the GPU Lightmass? I can't get them to actually produce light

[@tombittikoffer412]

They work for me.

[@VRDivision]

You may need to check an option on them "Use Emissive for static Lighting"

[@mostafasakkary2677]

Its pleasure to follow you Yahia ! Excuse me I have a 2 questions 1 - Is it available for UE 4.24.3 ?? 2 - I cant install lushong gbu lightmass for UE 4.24 It show me error when I open it it there is a special version from it for UE4 4.24 or what ?

[@krz9000]

this is a 4.26 feature...it needs the virtual texturing tech to get these previews

[@VRDivision]

this is only for 4.26 , for older versions like 4.25 we still use Luoshuang's GPULightmass

[@mostafasakkary2677]

Thanks a lot

[@GlGGl]

great tutorial! do you know if it's possible to use GPUlightmass (with RT enabled) .. and bake everything in the scene so it kind of doesn't use RT at all anymore. (like you did with disabling RT-features in postprocess - reflections, AO and so on). i followed your tutorial and it worked like a charme! but somehow it looks like there are still contact shadows (ambient occlusion-like) which are raytraced. i think that will impact the performance - or at least will be a problem with computers without RTX. is it even possible to use these projects on computers without RTX cards anymore? :D god, i have no clue right now! anyway. thanks for the video!

[@GlGGl]

Nevermind! I missed the slightly stupid logic to let the Enabled box on the left side be checked while the right box has to be unchecked!

[@GlGGl]

sry - me again. it helped, but i think the question is still there: using GPUlightmass but somehow don't use Raytracing in any other way

[@VRDivision]

Hey ma man! Thanks a lot for your comments and questions! Sorry I just saw this :( would you mind joining us on Discord and continue our conversation there? you can find me @yahiyajasem

[@zmiciermaslouski6753]

Thanks. What a graphic card do you use for it?

[@VRDivision]

GTX 1080TI!

[@cgcg2518]

when i build from bake from view only i get no calculations update in bttm right of window, it stays on zero? i also get ALOT of noise on my meshes after bake even when uv res is set to 512

[@VRDivision]

Are you building on preview or on production? There are other lighting tutorials on our channel you can also watch, I cover all the basics and how to setup and optimize your projects

[@artemaung5274]

So you just set RVT lightmass and it just bakes without any RVT volumes/object like you have to do with other virtual texturing stuff? Just set directX 12, and set lightmass from RVT in project settings and lightmass importance volume? That's it?

[@VRDivision]

Hey there, I'm sorry but I didn't understand what is RVT

[@SpirusFilms]

What GPU did you use for this demo?

[@VRDivision]

My GTX 1080TI

[@Vusal_Abbasov_3D]

Hi Yahiya I I did all like you did, but I could not find GPU Lightmass Plugin. Do you know how can I get it?

[@VRDivision]

Hey cheif! there you go :D kzbin.info/www/bejne/ppzPiKBnnah6aZo

[@Vusal_Abbasov_3D]

@@VRDivision Woow thank you so much for fast Answer :)

[@VRDivision]

@@Vusal_Abbasov_3D haha cheers!! ^^ happy new year!

[@VrainbowStudioGame]

i stuck at 39% when i restart , my specs : i7 8700k and rtx 2080

[@VRDivision]

Hi Minh, opening the project with RayTracing for the first time might take a while, I hope you solved the stuck issue by now!

[@VrainbowStudioGame]

@@VRDivision I tried but it's still stuck :(.

[@VRDivision]

@@VrainbowStudioGame I'm sorry to hear that! how large your project is? Do you have a backup of your project before enabling new options?

[@yantingye1677]

thank you

[@yantingye1677]

Why does ue4.26 use gpulightmass to bake, the whole picture, especially the dark places and shadows, flicker slightly? I clearly disabled ray tracing in the post-processing volume. It's strange that I still feel affected by ray tracing. Is it necessary to enter a command to completely disable ray tracing? But you can't turn on reflection and transparency using ray tracing alone, because these two functions can make up for some visual defects of gpulightmass after baking

[@VRDivision]

I think that's also because we need to disable ray traced shadows on every light source

[@thiagomoraes1499]

Is it possible to use this for Oculus Quest 2?

[@VRDivision]

I don't see why not, but don't go super high in the light maps textures rez

[@thiagomoraes1499]

@@VRDivision I'll try it out, thanks

[@daloantoine8433]

unreal engine 4.26.1 GPU lighting is completely instable..i return to 4.25 :(

[@VRDivision]

Depending on the project, the current version is in Beta, hopefully in thea near future it will be much more stable!

[@daloantoine8433]

@@VRDivision now it's 4.26.1 .... you think that it's still beta??

[@chiquiflita1]

if we had Luoshuang's GPULightmass do we need to do anything to get nvidia back to regular settings?

[@VRDivision]

I don't think there's need to do that

[@alexilaiho1st]

Cool, I'm digging v4.26, what's your GPU though?

[@VRDivision]

hell yeah! my GPU is 1080ti

[@FourShine_]

@@VRDivision How? Don't you need an RTX card to use GPU lightmass?

[@VRDivision]

@@FourShine_ I mean if you got RTX Card it would be much faster, Ray Tracing can work with GTX cards, it's slower, but you still can benefit from it even on lower spec cards

[@mehulvandara1648]

hello, after increase GI Samples:512 & Stationary Light Shadows:128 then unreal engine crashes. it don't work for me. and also i can not increase overridden light map resolution to : 64 only. so what can i do. this is my system in which i work amd 3700x nvidia 2070 super 16 gb ram 256 nvme & 2tb hdd please help me. thankyou

[@VRDivision]

Hi Mehul this is kinda hard to solve through KZbin comments, join our Discord community and I will do my best to be in help, cheers!

[@Mukhtar_SH]

I Coming from unreal engine main channel 🥳🥳🥳

[@VRDivision]

Welcome!!!

[@kuraiwolf4047]

When I enabled GPU lightmass, it caused my computer to blue screen when compiling shaders. Whats up with that?

[@VRDivision]

That's not supposed to happen, it never happened to me

[@VRDivision]

I think you should contact Epic support on that or post about it on the forums

[@aphermion]

I'm guessing you did the normal troubleshooting? Like a clean install / update of your graphics driver and deleting cached files? Would also help to look into the bluescreen dump file to see if it was GPU driver related or if it was memory or whatever.

[@kuraiwolf4047]

@@aphermion Turns out, it was some bugged drivers from Nvidia. Happens far too often with them to be honest. Almost every new driver has some problems.

[@aphermion]

@@kuraiwolf4047 Glad it was an easy fix!

[@SoDaPrice1998]

I have a non-RTX card [GTX 1650 4GB].... Can I enable and use it???

[@VRDivision]

Can you try and let me know? I was working on my 1080ti

[@SoDaPrice1998]

@@VRDivision Yup.... Actually I tried this yesterday, the GPU lightmapper works only when RTX enabled.........😭😭😭

[@cgcg2518]

i have no idea why your final bake looked good. mine with same settings looked like noisy shite

[@VRDivision]

Can you join us on discord and share some screenshot? Perhaps we can help!

[@justindavis2711]

It sucks that you cant use this with forward shading. It would be sooooo optimized if you could bake with raytracing and then play the game in foward shading.

[@tafraoutaboubakr5453]

its work with AMD Gpu???

[@VRDivision]

I didn't try it, do you have AMD? Can you try and let us know please?

[@tafraoutaboubakr5453]

​@@VRDivision Thanks, man, I will .... keep up

[@tafraoutaboubakr5453]

@@VRDivision hi man "AMD GPU" not supporting ray tracing... :(

[@_Thri]

"Get to the compiler! Eirghhh!"

[@VRDivision]

I didn't fully understand)

[@unrelentingpest]

@@VRDivision You have an accent similar to Arnold Schwarzenegger, and in some movie Arnold said "Get to the chopper!" I guess it's a reference to that.

[@VRDivision]

@@unrelentingpest ahhhh 😂this made my day thank you!

[@misssyarkins9062]

u can get faster! plug off real-time viewe port

[@VRDivision]

yes! I noticed that later :D thank you

[@pravenpjose7718]

nice tutorials

[@VRDivision]

Thanks!

[@CS79N]

Doesn't work. I just get "GPU lightmass requires ray tracing support which is disabled".

[@VRDivision]

still not working? Would love to help but can you join us on Discord and share a screenshot?

[@JayHPatel]

Yahiya taking over the UE world!

[@VRDivision]

MA MAN

[@decorix]

Great stuff thanks :-) If you have GTX 1050ti like me :-( it won't work!!

[@VRDivision]

I think it would work, give it a shot and lemme know!

[@decorix]

@@VRDivision Thanks. I did all the steps, but not working. I think it only works from gtx 1070 and up :-( So i'm missing out on the good stuff ;-)

[@decorix]

@@VRDivision Does the old Luos lightmass work with 4.26? as I can't new GPU on my gtx1050ti :-( just wondering. Thanks

[@marciopereira1726]

great

[@VRDivision]

thanks!

[@TheWillvoss]

any 1080ti love?

[@VRDivision]

of course! my card is 1080ti, the whole video is recorded on 1080ti :D

[@TheWillvoss]

@@VRDivision whaaaaaaaaaaaaaaaaaaaaaaattttttttttttttttttttt. Good to know! I cant find a 3080 for the life of me, and im not going to pay scalper pricing. Thanks again!

[@tech-ii5sh]

This would been great to use, but when you do not have Ray Tracing, it is useless to use.

[@VRDivision]

Any GTX card can work, you should also disable ray tracing features when using GPULM

[@tech-ii5sh]

@@VRDivision Thank you for the response. I will give it a try since it is asking me to use Ray Tracing which my card does not support. Currently, it is nearly impossible to upgrade to a new GPU with Ray Tracing support unless you want to pay for way over priced cards from Scalpers.

[@z00mzet]

whats that instrumental? lol

[@VRDivision]

I wish I knew xD

[@ammaralammouri1270]

ملك يحيى .... طاير أجربه

[@VRDivision]

شكرا غالي

[@VRDivision]

Project files and more www.vr-division.com/blog/unreal-engine-426-gpu-lightmass-resources

[@ep1cn3ss2]

Your website is expired it says

[@VRDivision]

@@ep1cn3ss2 Thanks! I fixed it

[@ep1cn3ss2]

@@VRDivision No problem, wonderful :]

[@VRDivision]

Check out our Unreal Engine Masterclass for architects and designers gumroad.com/yahiyajasem#tVelP

[@Your_Delusiona1]

Upgrade your GPU

[@VRDivision]

I wish it was that easy in Turkey, the prices here for GPUs and PCs, HMDs are double or triple -_-

[@Your_Delusiona1]

@@VRDivision damn, kinda similar to New Zealand. Luckily I got a six month old 2080 Ti ROG Strix for $1300 which is not too bad cause the original price is double the amount at the time I got it (last year November) plus there weren't any 3080's available too. So the 2080 Ti was the only GPU worth getting over the 8gb 3070 for 3D work.

[@bellousow2607]

😂 this is fucking Amazing