Ambient Occlusion as Fast As Possible 

Watching this in 2020, and Ray Tracing is a beautiful thing.

Hey Linus, I'm from the future, and Ray Tracing is a thing now. Best Wishes, Guy from 2019

8 years later and we now have, prior impossible, true ambient occlusion (also known as ray tracing) in video games

4:35 my right ear was being violated by a low rumble

Will TechQuickie be made in 60fps when available, I think it would help reduce the green blur when Linus moves quickly.

"But is still a far cry from true ambient occlusion." *ba-dum tiss*

2021 here, "uber" computers are a thing and damn is it beautiful.

Short and concise. :) Looking forward to see more.

Ambient occlusion is one of the most amazing things in 3D.

Linus you're the man! You're everywhere when you are most needed! I think that your explanations are the best out there because there are accurate, well-explained and non-biased towards any sponsor, and that makes your sponsors ads a lot more acceptable for me. Great job man! If you came by Mar del Plata I'll buy you a beer!

2022. LTT has taught us all ALOT. To think we talked about this stuff like a myth wondering if it would ever happen and now here we are PCS easily do it consoles finally do it and it just keeps getting better

Now THIS was a helpful techquickie! Thanks Linus!

4:57 Was that just me or did it just blink?

"A far cry for ambient occlusion" What's with the terrible puns :P

Something interesting: the source engine calculates all lighting of static objects beforehand and therefore only has to worry about lighting dynamic objects in real time

That low hum in the audio near the end of the video.

Ssao is still very nice, and makes the scene look a lot more realistic, these couple of years later

Techquickie I'm a graphics programmer and I really liked this video Linus you did a great job! Everything said was true :D I just made some new ambient occlusion. I call it Natural Horizon Based Ambient Occlusion.

I wish that Techquickie videos had an endless supply of new videos... I need them

Thnx Linus! your videos are always helpful c:

Never mind the low frequency hum. whats with the screen flashing black starting from 4:48 it only affects the green screen also his hands look weird throughout the whole video..

if you render at a higher resolution, apply ssao, and then downsample back to your screen resolution ssao will be appropriately blurred.

These are so helpful! Thanks Linus!

i was waiting for this as Fast As Possible for a while now, awsome!

One issue with true dynamic ambient occlusion is the amount and shade of the shadow cast on an object in real life can be influenced by the ambient occlusion of another object. So if a reddish shadow is cast on a white wall, that white wall would should then also be casting a shadow with a bit of red tint. The issue with this is knowing what object and what light source to start with, without being required to do pass after pass to get an accurate result. This is why ray tracing is really the only sane solution.

that explains why crysis was so difficult to run. my 9800 GT barely ran it.

awesome video guys, very interesting stuff right there!

Thanks for the 4k option!

You had some flickering at the end of the video. Intentional?

3:03 lol "FarCry"

I love Linus's ad integrations.

Am i the only one who notice that this is the first video in this channel that you can watch in 4K?? Blew my mind that that was a actual option, Thumbs up!

1:53 linus wtf went wrong with the green screen editing? Look at ur hands.

2020 Q4 : 8k gaming with Ray tracing is possible.

0:59 - In this part, when Linus says "Ambient Lighting", he means "Ambient Occlusion" - the two are not the same thing. Unfortunately, this video explains "Ambient Occlusion" without first defining what "Ambient Lighting" is in computer graphics context.

Thanks for the explanation really good to know

3:37 HEY! i'm from the future and you have real time ray tracing in 2020.

4K huh?

😂 I’m a new indie game dev learning about all this and I saw you! Lol I HAD to click on it :) thank you dude lol.

I thought the background flickering would be another gag or something but it's probably just Linus's lambo shaking the house while it warms up

“Ray tracing is super taxing on hardware” Oh boy Linus is in for one hell of a surprise isn’t he

4:35 for some reason I hear a low hum in my right headphone.

even simplier, its the dark aura around objects which makes them look like the lighting and shadows around them is "reallistic"

Damn, There was a pulseway ad with Linus in it, before the video started, and I didn't realise, I wasn't watching the real video. about to download pulseway now

what about HBAO?

Hello “4 years ago” Linus, we are finally there with hybrid ray tracing from Nvidia.

Great video as always, but why is the volume level on these videos always so low compared to other videos on youtube?

pretty good explanation. keep the good work

3:24 linus predicts RTX

I just want to know if I should turn it on or off in H1Z1

The fun thing about ray tracing is that it is actually used in some games, such as in Source Engine based ones, like Portal 2, the Left 4 Dead series and Counter Strike Global Offensive. However, it is pre-computed and baked into the levels so that your computer does not have to calculate it in real-time, which of course means that Source lighting can't be dynamic except in some particular cases. It's still a pretty cool thing though, I wonder why not many other engines support it.

Discussing the difference between modems and routers would make a useful video.

is it just me or is the video a bit glitchy?

Nvidia RTX implemented Ray-Tracing Tech. Make a Video on that too! It'll be Very Interesting !

I always thought of it as "that thing that makes the corners shadowy", but this works too. :D

Good video. Keep up the good work.

This is a really bad and overcomplicated way of explaining AO. AO is a technique invented by Pixar (like many things in computer graphics) before raytracing was fast enough to be used in movies. Rather than trace each ray of light to see what it hits, you just assume the entire environment is lit, and make a few checks to see if anything is blocking the sky. Taking into account only nearby objects. That is much faster but can look weird sometimes. This shows up as a smooth darkening of corners and depressions in the surface. SSAO is a technique invented by Crytek for Crysis. Instead of the more accurate and expensive AO calculations used by Pixar, they simply look at the depth values from the graphics card and use a type of blur effect to make objects that are near each other on the screen cast a smooth darkening around them like AO. SS stands for Screen Space. HBAO is an improvement by Nvidia, that rather than a simple blur tries to more accurately estimate the "horizon" created by nearby obstacles. Horizon Based AO.

Stupid modern technology and it's limitations....

Looks like other people noticed the low rumbling sound near the end of the video, but did anyone else notice the screen (youtube player screen) flashing?? I started once the sound rumbling started. Kinda odd.

You are good at what you do, mr explainer man! You got a new subscriber

„Raytracing is impossible to render in real time!“ Nvidia: hold my Beer !!!

i like the fact that this video provides 4k option.... like everybody have 500 dollars for a damn 4k monitor :3

anyone else notice the low frequency hum near the end of the video? also the green screen flickering, i would hazard a guess was related.

1:07 Ambient lightning is a part of Phong shading ;) I know that because I had to implement it twice this semester and I'm watching this video now because I have a graphics final tomorrow. Never thought I would be watching Linus the day before a test to actually prepare for the test haha.

listening in 2019 when rtx is actually a thing

Ray Tracing is theeeeere

weird, your video is the most technical I found, it was still a little bit to flat to use it for learning for an exam, but hell it still beats most of those gamy videos by far.

Wow Linus, an advertisement which has something to do with the channel and might even interest me, amazing...

3:35 Nearly impossible to achieve, you say...just wait 4 years

AO in video games look horrible and unreal. I turn it off usually. Because, in lot of games- AO appears when you go near a wall and it creates black borders around the object/character even where the light ray is falling. It makes it looked like cell shaded. Ah, and Far Cry 3 was worse one I've ever seen. Anyway, I just noticed Ambient Occlusion [AO] around Linus's hand.

What was that bass sound that started at 4:35 and didn't stop until the video ended?

Hey Linus, could you make a video on how touch screens works ?

First Dislike

Linus uploads in 4k now!!

Now that Linus uploads in 4k I must get a 4k monitor!

so guys, i had this with all 4k videos since two or three weeks: as soon as i switch to 4k and skip the video back to start so that it switches to 4k, it loads the whole player anew... from html5 to flash-player. this sucks because it seems like flash-player can't handle 4k and drops loads and loads of frames and is lagging like crazy. i haven't had this problem before, i could watch 4k easily with my hardware...

Best outro in quite some time :)

"... but it's still a far cry from true ambient occlusion..." I see what you did there Linus.

3:39 There was a company that was making "Ray Processing Units" a few years ago, but they got bought out by another company and nobody has heard of the RPU since. However, an RPU would have theoretically enabled realtime Ray Tracing and Ambient Occlusion at decent framerates and resolutions. Since it would have been a separate component from the GPU, the same card would have been good for the same resolutions/framerates in newer, prettier games as long as you had a better graphics card, and the same graphics card would be good for the same pretty games at higher resolutions/framerates as long as you had a better RPU.

techquickie in 4K! sweeeeeet i wish i only could experience that

Is the flickering at the end of the video caused by differences in lighting ?

2:13 that's the Radeon 5770 by Asus (Asus EAH5770 CuCore). That's the card I have in my PC right now (except with a Zalman VF1000 heatsink)

A Quickie about display panel types would rock.

Linus there is so easy problems with the end of your video it could be just me but the background keeps flashing black except for the corners

Because of that rumble and green screen glitches, I expected an all out horror outro. Was ready for anything.

I really enjoyed the ambient occlusion fo dis video

there was a freakin TD bank commercial just before the beginning of this video Linus that shit actualy made me cry! :o(

Hmm, may I suggest a topic about headphones. What is there about impedance, frequency response and the like?

in blender cycles, with a good gpu in simpler scenes, you can get pretty close to realtime

Hey Linus I know you did a video on SLI vs Crossfire, but im curious about how each works. I heard SLI simply divides the screen into halves, thirds or even quarters assigning each section to one gpu, while crossfire has each card render ever other frame, or every 3rd frame, or even every 4th frame. Is this true? it would be cool to show a video on how this works. Thanks

Should have mentioned sparse voxel octree illumination, where it breaks the scene up into ever more detailed cubes which interact with each other to create essentially the most accurate real-time approximation to date; enough that you really don't need much more than that. Unreal Engine 4 used it as their primary lighting model, until the axed support of it recently due to the hardware requirements not meeting their standard of high performance on older hardware.

So how close is Voxel-based ambient occlusion to ray tracing?

Google Brigade 3, the framerate is not that much of a problem, the noise is. The creator of brigade estimated ~1-2 GPU generations before this will be usable in commercial applications IF the GPU manufacturers will put extra features that could benefit ray tracing. The brigade 3 demos were run on SLI duo GTX Titans. And that was almost year ago.

There seemed to be some funky things going on with the green-screen, and the audio in this video XD.

Hey Linus, was wondering if you are able to make that Mac vs pc video. I don't think the missus fully understands why I'd rather upgrade her pc. Could use some backup lol. Thanks.

simply amazing

WOAH 4k!?

LinusTechTips on 0:42 the second cube should have afull shadow and not a fading one since there is no other cube behind it that reflects light (and thus making the 2nd cube's shadow to fade)

Hey could you explain further what pixel depth vs scene geometry is? Didn't quite get that.

what about HBAO? i was kinda surprised that you didn't bring that up.