UE4 - Introduction to Realtime Raytracing (RTX Overview)

[@ThatRyanManning]

If you want to go deeper with RTX in UE4, check out my Masterclass on RTX in UE4: academy.thatryanmanning.com/courses/rtx-interior-lighting-masterclass

[@DodaGarcia]

When I watch your videos it surprises me I was even able to launch the engine at all with how little it turns out I know of the very basics

[@TheWillvoss]

Thanks as always. Lets see how far this 1080ti can go!

[@NoMatterDesign]

For the people stuck at the Directx12: Create a shortcut of UE4Editor.exe and at Target add -dx12 at the end of line (after the "...." -dx12). Don't forget to leave a space between the "[space]-dx12 forums.unrealengine.com/community/general-discussion/86616-how-to-active-directx-12

[@yorisongs9804]

ありがとう。Problem solved. cheers.

[@micheleditaranto6327]

Very good. Your aproach so pragmatic, has been very useful for me. Nice work!

[@ludwigek835]

Great tutorial!

[@Guevonsaso]

Excellent as usual!!! you have a facility to speak and make it for people understandable, it's incredible!. So, the less the time in miliseconds is, the better it is performance talking? :D

[@artistjosephtubb]

Great video!! Thank you for sharing. Could you do a video on best practices and debugging for light baking? As an Archviz Artist, I find this is the most challenging aspect of using UE.

[@ThatRyanManning]

Thanks for the suggestion! I'll add it to my list for future videos. I think that's a great topic and much needed.

[@stanislavbidyuk]

Great video, thank you

[@beeceelad]

Interesting, when I add the -dx12 flag on the target while updating the shortcut, Windows says there's no such file path. I just fixed it and it should say something like "C:\Program Files\Epic Games\UE_\Engine\Binaries\Win64\UE4Editor.exe" -dx12 Include those quotation marks with -dx12 outside them. There might have been an update that affects this since you uploaded.

[@camiloguerrero2]

Great video. Which mobile workstation do you recommend to work with UE5

[@astonyo7544]

Great tutorials Ryan! Could you make a tutorials about raytracing vs lightmass

[@LOLGotYerTags]

I can't even get all the raytracing stuff to show like you have at 6:36. I've enabled DX12, Enabled the raytracing in the project settings and restarted the editor.. nadda.. This is on the latest build of UE4 also with latest drivers and an RTX 2080Ti.

[@arcitek66]

Hello Ryan. I have to say, your videos are some of my favorite UE videos in the way you are so articulate in explaining your process and approach. My question is how are you getting frame rates converted from the milliseconds? I was trying to figure out how you came up with 30 fps from your approx. 20 ms in raytracing reflections. I have checked online for a convertor and have no been able to find one or work out the logic. I know they are both connected. If I am correct, I think I saw that 60 fps = roughly 16.7 ms.per frame (1000/60 fps). I am showing roughly 9.1 ms on my scene raytracing. Also, do you cover the hybrid approach in some detail with your RTX masterclass?

[@ThatRyanManning]

90 FPS =11.11ms, 60 FPS = 16.66ms, 30 FPS = 33.33ms. Calculator: www.hardwarepal.com/frame-time-calculator-fps/ "Also, do you cover the hybrid approach in some detail with your RTX masterclass?" - Yes! In fact, that is one of the pillars of the class; showing how you can leverage RTX but still use the traditional principles of lighting. There are several chapters that cover this theory. academy.thatryanmanning.com/courses/rtx-interior-lighting-masterclass

[@arcitek66]

@@ThatRyanManning Great, I will purchase your course in 10 minutes. Lastly, do you cover anywhere in more detail some of these raytrace settings? I am getting flickering now on some assets and I cannot figure out why. It is not co planar surfaces on top of one another if you know what I mean. It is just this random flickers that occurs at times. There seems to be settings on materials, lighting and the post processing for raytracing and you touched on it but I am hoping you go into a bit more detail like maybe the path tracing and pixel sampling.

[@ThatRyanManning]

@@arcitek66 I do cover the raytracing settings on both lights and in the post processing volume. Should cover most of what you need, but in the event it doesn't, after purchasing the course you'll get a link to my discord. You can always ask questions and post screenshots there. :)

[@infotreetv1379]

Wow from many times I was thinking about it, can we use ray tracing with light build ? And you explained it as hybrid technique! Thank you so much ❤️

[@shanesumsion5569]

For the materials, using the RT switch-replace ... for Base Color you have Red as your RT, and for Roughness you have 0.1 -- you mention as several others do, that the Roughness right now is best as a 0 or 1 ... is that actually to mean a single float as opposed to a float value for each pixel as in a Roughness map ... or really just a binary 0 or 1?

[@ThatRyanManning]

"Base Color you have Red as your RT" I assigned the red color as a "debug". You could just as easily hook up a custom RT Texture map and/or different values for roughness. The general idea is that with raytracing (in it's current state) is that you want to avoid middle ground values in your roughness. Since RT performance works best with either ALL or NO raytracing, having values in the middle won't necessarily cause problems, however, the performance of semi-rough materials gets expensive quickly. So, in short, you can use textures in your roughness, just try and make sure their either almost all roughness or almost no roughness.

[@xiadisun8715]

Awesome work bro！Appreciate it! Question: why some people's project shows lots of noise when using Ray Tracing?

[@ThatRyanManning]

More than likely it's post processing effects causing the noise.

[@tresillianofficial]

hey ryan is the hacky setup still necessary these days? goin to try this with my new rig for the first time next week - has anything changed in terms of getting it going? any good tutorial you can point me in the direction of? cheers mate!

[@ThatRyanManning]

Thankfully not with 4.24 or higher. Simply select the "DirectX 12" dropdown from the Project Settings -> Windows -> Default RHI and restart the editor: i.imgur.com/o8Tm2cy.jpg

[@ponimania]

10:30 - Skip actiavation features and chitchat.

[@rebx5891]

Do you know if there's a way to take a very high resolution screenshots/image when using Ray Tracing? I'm running dual RTX 2080 tis and capping out around 3k or 3.5k. I've edited the Registry things to enable a delay, but still has a cap around there with resolution. Also - thank you for your awesome videos, I've been using UE4 for years professionally and your vids are some of the most succinct for picking up new and useful information quickly.

[@ThatRyanManning]

In your viewport, click the drop down arrow and select "High Resolution Screenshot" i.imgur.com/D83VsHJ.png

[@rebx5891]

@@ThatRyanManning Sorry - let me clarify. I typically use the High Resolution Screenshot. However, with Ray-Tracing, It seems capped at 3.5k resolution before it crashes since it's all real-time on the GPU (unlike baked lighting which I can capture at like 8-10k). There's so much on Ray-Tracing, but nothing seems to focus on the actual output, just working in the editor. Just curious if there's a way to push for 4K+ High Resolution Screenshots that won't crash the GPU. Not sure if it's possible to delay / lock the Ray Tracing result and capture or what. But yeah, thought I'd ask in case you have experience in high fidelity capture of the ray-tracing workflow. Thank you very much again.

[@wilsione]

how to know if my quadro cards is compatible with raytracing? I tried some settings on webinar from ue4 but it seems no difference from toggling it on and off..im using quadro m6000 12gb gpu

[@ThatRyanManning]

This is the latest from Nvidia: www.nvidia.com/content/dam/en-zz/Solutions/geforce/news/geforce-rtx-gtx-dxr/geforce-rtx-gtx-dxr-supported-gpus-march-2019-850px.png Doesn't look like the m6000 support realtime raytracing.

[@ThatRyanManning]

www.nvidia.com/en-us/geforce/news/geforce-gtx-dxr-ray-tracing-available-now/

[@wilsione]

@@ThatRyanManning That is why probably it seems not to work..Thank you for the reply i have been following your tutorials..Please focus on Archviz as complete workflow from 3d,import,materials,render to post process..Keep it up Bro!

[@ady7d77]

help, i tried to change the editor and it says invalid

[@sinfulai2507]

So I need help on this. My unreal engine runs perfectly fine without the -dx12 in the properties, but whenever I type in -dx12 and try to run it, it crashes and says my video driver isn't up to date the moment it loads into the window where it shows my projects. I have not seen any other comment or youtube video on how to fix this, I am running unreal engine at the latest update as of today which is 4.23.1. I have an Rtx 2080 TI and I really wanted to see Raytracing in action on some of my projects. I have GeForce experience and it says my drivers is up to date even if I try forcing it to update. I tried troubleshooting the problem and that still doesn't help. Do you know anything about this problem? Is it my engine version, or is it something else? I have windows 10 at the 1903 build. I cannot find the problem even looking it up anywhere doesn't help.

[@ThatRyanManning]

Sounds like you're setup is correct and you've toggled all the necessary prerequesities. Did you enable "Raytracing" in the Project settings prior to enabling the Raytracing flag in the shortcut?

[@sinfulai2507]

Ryan Manning yes I did but I didn’t notice anything change after enabling it

[@ThatRyanManning]

@@sinfulai2507 I haven't checked with 4.23, but you might not need the -dx12 flag anymore. Check midway down the page to see where to enable the "Default RHI" docs.unrealengine.com/en-US/Engine/Rendering/RayTracing/index.html

[@sinfulai2507]

@@ThatRyanManning I enabled the RHI to DX12, it lets me open up the library and stuff but the moment I load into the project it says the same stuff and crashes the same way.

[@ThatRyanManning]

@@sinfulai2507 maybe it's your project? Have you tried a default project?

[@andristefanus]

i bought rtx 2060 last week, i haven't use the tech yet, need to use the great potential of it, and i currently using windows 1909, should i roll back to 1809?

[@ThatRyanManning]

No need to rollback. In fact, check out this video for the updated method: kzbin.info/www/bejne/oYnCoKBorJaabM0

[@ady7d77]

it doesn't let me , it says it is not valid, but i can see you don't have double apostrophe and i have at the beggining and at the end

[@ThatRyanManning]

Doesn't let you what?....run DX12 mode?

[@NoMatterDesign]

Create a shortcut of UE4Editor.exe and at Target add -dx12 at the end of line (after the "...." -dx12). forums.unrealengine.com/community/general-discussion/86616-how-to-active-directx-12

[@wilismatrix9847]

You need to add (-dx12) after the " ..." like this : "C:\Program Files\Epic Games\[YOUR VERSION]\Engine\Binaries\Win64\UE4Editor.exe" -dx12

[@TheKitneys]

My rig is stuffed full of 1080 Ti's for GPU rendering... UE4.23... useless :(

[@ThatRyanManning]

Those will be useful for realtime lighting but won't help you with baked lighting unfortunately.

[@aniket33591]

This is DXR, RTX and Radeon Rays 4.0 will ptobably have better hardware support and optimization.

[@_skiel]

aaaaaaaaand crash :( *** i7 8086k - gtx 1080

[@St1ngerGuy]

Does nobody pay attention when he states first that you REQUIRE an RTX 20 series card for realtime raytracing? Half the comments are 10 series people having problems. It won't work with a 10 series card...like at all.

[@prographicarchitecturestud1707]

@@St1ngerGuy it does work with 10 series if you update to latest drivers and you have at least 1070.

[@user_375a82]

Ray tracing is not that big a deal because before you could fake it nearly PERFECTLY by using cameras looking somewhere and projecting onto a reflective surface (just not exactly where they should be looking). So who can tell the difference? NOBODY. Maybe there is some smart-ass-way to leverage the RT effect to awe and shock, but I prefer 60 fps instead of 10 fps - lol.

[@ThatRyanManning]

You're not far off in that RTX isn't the "easy button" that makes everything perfect. However, there are some deeper things that RTX does besides accurate reflections. (Shamless plug inbounds) You may want to check out the Masterclass is did recently on RTX in UE4: academy.thatryanmanning.com/courses/rtx-interior-lighting-masterclass