Some additional links from the video. Also, working discord link: Discord: graphics-programming.org/ RC Experimental Testbed: www.shadertoy.com/view/4ctXD8

I never thought I'd see Radiance Cascades, let alone create one!

I knew those PoE2 devs were up to something!

Gordon doesn't need to hear all this, he's a highly trained professional!

The Penumbra Condition sounds like a nice title for a game

So this approach, but for audio, would be called a "resonance cascade"?

That one statement @ 2:08 is precisely why I love this channel. Although i cant deny how much i need the maths in my life

The original presentation by alexander for those that are interested: kzfaq.info/get/bejne/ith4e7eC1tOlkYE.html

What’s next, Radiance Cascading Style Sheets?!

"Most of us are programmers, not math people." -> that's a great quote.

Ever since Exilecon i've been waiting for someone to do a nice video breakdown of Radiance Cascades. I can see it becoming a mainstream technique in the upcoming years, so much potential

It all makes so much sense when you explain and show it to us. Without your video, i would get lost in "paper" articles with just a few images. Scrolling through equations and getting familiar with new terms. Thanks for another great video SimonDev. 👍

This channel is a gold mine. Thank you.

Seeing you refrence Aleksander Sannikovs paper is not something I was expecting :O

Looking through the comments, and I'm glad that I'm not the only one who thought the title said "Resonance Cascade"

lets hope to see this implemented in some open source engines. and especially blender. this could be really good tech to at least preview renders.

Nice animations, and intuitive explanations, great video! And thanks for consulting & mentioning the community at the end :D

Such an intuitive explanation of a super cool rendering method. Awesome work! The only thing I would have loved to see more detail is the actual implementation, especially: How does a point on the screen actually get it's value? A raycast I assume? how does the raycast avoid having to loop over every light source in the image to find a collision? Also, is your explanation only valid in 2d, would it map into 3d by projecting all the points onto the nearest surface, or would it need a 3d matrix of points everywhere? Some of this could have perhaps been clarified by a brief section detailing where this method can be used and where it can not be used as presented. Other than these nitpicks / curious questions though, excellent intuitive explanation!

I always know you're going to make me understand something new in the way that I need it to understand it. I think we speak the same exact language; like a mixture of nothing-is-new-just-another-rehashed-version-of-the-same-stuff-we-already-did, and developer-that-wants-his-code-to-run-as-fast-as-possible. Thank you. Every time. Thank you for speaking my language.

This is really beautiful! Well done.

I love the fact that the explanations in this video are really easy to understand,great video!

This is really cool. Thanks for explaining it in an easy to understand manner!

Excellent presentation. Thank you!

Thanks for helping give this awesome paper wider visibility! It's a fantastic insight.

Lowkey wanna suggest that the term that comes after "umbra, penumbra" should be called "bruh."

Thank you so much for sharing this knowledge! Super interesting video, as always

This is the answer I was looking for. Thank you for this fracking awesome video. You sir are appreciated.

for those curious, cem yuksel has a series of graphics videos that are very easy to understand, including a really intuitive explanation of the rendering equation. he does things very visually

Thanks so much for the website, it's so cool!

So what it's sounding like is multiple resolutions of like real time light probes? You create a fixed grid of probes, and then occasionally precompute the incoming light from different directions for each point, and then when determining the light of any point, you interpolate the light between the points, for each "cascade" of light and then combine them together? At least that's what I'm gathering. This way for each point you're only computing the light from the nearest few cascade points not the whole scene

Thank you so much for sharing your valuable knowledge! :)

Okay…I’m on my fourth watch of this and I can feel myself *slowwwwwly* getting to grips with it, but even with a background in physics and maths (my degrees are in physics and electronic engineering) and a long career as a systems architect, I’ll be honest: I’m struggling. It’s a testament both to the PoE developers for the original idea and to Simon (who I follow) that this is penetrating my thick skull at all. Definitely not for the faint of heart but it’s worth watching over and over until it clicks because the end result is fucking gorgeous. Thanks Simon (aka Bob from Bobs Burgers) ❤️

oh man i'm so hype to have bob belcher explain new and exciting graphics techniques to me

Amazing video. Thanks Simon.

the legend is back with a new upload!

I've really liked the demo! If you add the possibility to upload an image from wich generate the lights/shadows, and the posibility to change the backgound, you can sell it/launch it as a tool for graphic designers!

thanks for the laughter and learning in every video!

Crazy good idea and so simple in a way.

amazing video!

13:18 Is it really live on your website? I don't see it, only Grass, Cloud, FPS Game and Minecraft projects.

I love this lighting - definitely an inspiration towards trying new things - you never know what might work!

I feel like this is what CS2 uses for its lighting probes. If you look at the debug menu, you can see the transition from more sparse probes to more dense probes depending on some conditions. I like computer graphics but hate programming so I wouldn’t know tho.

Great to see the crazy graphics devs at GGG getting some love!

Commenting mainly for the algorithm, but thank you for the video, please keep it up!

Hurray, new video!

GorDon doesn' need to hear all this, he'sa highly trained propfessional. We've assurdly administrated that nothing-will-go-wrong.

I started creating my own game engine to learn how it works behind the scenes, all because of your videos. But since I only know JavaScript, I felt intimidated by WebGL and did everything in context2D. Your video on spatial hash grids helped me a lot to create my own version with dynamic ranges instead of fixed arrays. Watching this video, I realized my improvised lighting system in 2D is pretty humble lol.

Interesting video, ty.

This is so damn impressive. Graphics programming really does feel like magic sometimes.

Awesome video, thought it would be realistic lightning bolts which would also be interesting since I've looked into it a bit but can't find much usable information on it.

Thanks!

This is beautiful

Great stuff. Although the project isn't in the projects list?

Thanks you for linking the paper. For such complex topics I like to carefully read an article rather than just watch the video

I was gonna read that pdf he released about the technology. And now i dont have to :) Thanks!

The live demo seems not to be available on your homepage yet.

Love it! I bet this or some more practical example would be interesting to 2kliksphilip too

Someone call Sebastian Lague!

Hmm, I think you could also use lower resolution cascades the further away you are from the camera, to save up on computation! :D I'm definitely going to try working with this!!!

Been waiting for someone else to validate this technique. It's really cool to hear promises, but always even better when others get to compare the results. Would have loved a comparison with some other technique, though since you've only implemented on 2D I guess you can't really compare with your 3D ray-trace model.

This effect is beautiful! Thanks for sharing! Also can you help me find your demo? I'm on the projects page and I don't see it!

"They're _waiting_ for you Simon.. in the *dev* chamberrrr..."

Cant wait for unreal engine to pick up on this. Very nice!

Cool, reminds me of voxel cone tracing with 3D clipmaps. It also has the same issues: light leakage, not good at perfect reflections but hopefully the new technique scales better and uses less vram. I'll have to look at the paper once it's released in its final form. Edit: Btw. for 2D you can make cone tracing work quite well and fast for GI. I only implemented the 3D version 8 years ago. A little bit surprised that it was hardly adapted since it can work quite well in certain types of games.

Maybe I'm missing something, but I think this only works in screen space, right? Therefore, it'll exhibit the usual disocclusion artifacts that such techniques have, such as SSAO, SSR.

Love your video what are you using for editing presentation anims?

its about to go critical!

Great video Simon - the projects page isn't showing that demo though, may need the caches clearing?

These animations look top notch. Any chance of sharing what software you use to create them?

I'm glad you had a good experience with the graphics programming discord! Personally I found them extremely unwilling to answer questions, saw a lot of condescending and demeaning replies to newbies asking questions.

Awesome video, however I have one suggestion. In this video, even at 1080p, KZfaq's video compression and low bitrate are extremely noticeable and there are a lot of artifacts all over the place the entire time. As a suggestion, could you upload videos like this at 1440p in the future? Even for people with a 1080p display, this can make a massive change in how clean the video looks because of the better bitrate.

Still can't overappreciate what NVidia did in 2018. We still aren't fully there, but it put us so much closer.

Reminds me of a video from several years back on Unitys Light Probes. I have VERY little understanding on how all this works though so not sure how similar they are other then they attempt to help solve the same issue of lighting.

Perfect video to watch when my PC renders my blender scene.

I understood everything up until the radiance cascades nodes. The rays are casting out something to something, because directions... uh, you do it again because idk, then you have another pair of nodes doing something farther away... then you combine it for some reason, somehow... and you get this magical thing I can't explain. 🥴 This is just before the GPU part and using pixels to solve for ray directions.

with my brains and your brawns, we'll make an excellent team!

Could you do a video about different shadow techniques? From basic shadow mapping using hard coded projection params [like in directional shadows ortho(left: -10, right: 10, bottom: -10, top: 10, near: -10, far: 10)], through tight projection math, normal bias, texel size world space, etc. to CSM and VSM?

Sounds like this would be perfect for Minecraft ESPECIALLY!

very informative video on this technique!

damn this is a interesting idea

Hi, just tried the live demo on your projects page and it's melting my gtx 1080ti at highest quality settings also on my 21:9 monitor brush is squished along Y axis very cool demo though

Neat

Cool

Radiance cascade? Don't let some mute in an orange jumpsuit hear that.

For some reason, even though you explained all it's doing, the end result looks better than what I would imagine if you didn't show it. Like I'd expect worse artifacts from this.

i watched the original video a year back on alex sannikov channel

I am curious to see what the bias is like for large scenes though. It reminds me a bit of "surfels" which were developed by EA if I remember correctly. It was an innovative technique but contributed a lot of bias to get real-time noise free images. The way this method is layed out, it seems like that's also going to be the case here, limiting it's effective use in real-time games with certain FPS goals

This man clearly never heard of the Black Mesa cautionary tale 😬

I really appreciate the content, but I still had trouble following this one. Hopefully I can get some insight from your next post..!

1:50 Im confused... I thought that was raytracing Also remembered you can limit the max bounce count.

yay graphics!

👏👏

@SimonDev I don't see the demo on your Projects page, I only see Grass, Clouds, the FPS, and Minecraft ones

Hi. So the discord invite doesn't seem to work. It's possible it's just for me tho.

I’m putting together a dev/design portfolio site and would love to theme it around the kind of dynamic lighting you showcase on your site. Would you mind sharing the stack you’re using? I’m not asking for your source code or anything, I’m just relatively unfamiliar with bringing lighting simulations into the web world at this level of sophistication

I can't find the demo on your website

I uhhh.... yup!

I cannot find the demo

Could just be me but it felt like the video ended a bit soon. Like I am not sure how you get from "layers of probes at different resolutions sampling lighting" to what you show at the end. Also is this global illumination? because it looks more like direct illumination with soft shadows and emmissive surfaces (which is addmittedley impressive in it's own right if it runs fast).

Finally another video!