Photorealistic VR (Path Tracer)

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Re: Photorealistic VR (Path Tracer)

Post by Scog »

Advantages of the pathtracing approach could include native warp aware rendering and free supersampling eliminating some of the performance penalties inherent in the current over sized raster+post warp approach required for high quality anti-aliased images. Add eye tracking and adaptive quality rendering and I reckon it could be done with todays hardware. No doubt by the time the consumer rift rolls around, this stuff will be looking a lot more practical.

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Re: Photorealistic VR (Path Tracer)

Post by colocolo »

nice, OTOY is going to present their engine with a 50 minutes talk at GTC on Tuesday.

http://raytracey.blogspot.co.nz/
https://registration.gputechconf.com/fo ... ector=Talk

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Re: Photorealistic VR (Path Tracer)

Post by PasticheDonkey »

the problem for approaches like this is that the traditional method is getting to a point of per pixel geometry any way. so that plus baked lighting or what ever they cook up for real time lighting will probably run better on cards designed to accelerate that method.

if i get per pixel geometry and textures up to 5 inches away from the model then there's no real need for improvement beyond that on those criteria.

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Re: Photorealistic VR (Path Tracer)

Post by colocolo »

i thought i had to share this, although its only a commentary, but tells sth interesting about the future of gaming.
the respond to 'Mark' was one of the most intersting answers. :D
quote from http://raytracey.blogspot.de/ commentaries
Well, obviously not for the PS4, because Sam Lapere just told that, but probably for the cloud, SLI Titan Rigs or next next gen consoles, i think.


Sam Lapere said...
Hi, sorry for the delay in answering. Great to see so much enthusiasm :)

Anonymous, Teemu, colocolo: the session was recorded and shoulds appear on Nvida's website soon. I will post a link once it's there.

Mark: yes, we've been approached by some of the largest game developers in the industry to use Brigade. Unfortunately I can't tell which ones.

MrPapillon: exactly, we still need some work on the tools side of things, but we're getting there

Reaven: Brigade is actually quite easy to develop game content for. There are almost no corner cases compared to a rasterizer. You don't need to worry about transparent surfaces, hundreds of lights, shadow map resolution, depth of field artifacts, ...
The tech is not fully there yet, but we have made enormous progress over the course of one year (a year ago, I never thought we could do the massively dynamic scenes that we can do today) and I'm convinced that we will have a very compelling product very soon.

Sean: thanks for your comment, couldn't have said it better

Anonymous: yes, yebis is used. More on that on the GDC next week.

Anonymous: yes, we can now edit all the materials via a simple GUI at runtime.


During the next days, we are going to record and upload some videos of the Brigade demo shown at GTC. The video files are huge and Youtube sometimes tends to cancel the upload for no reason, so please be patient.

March 19, 2013 at 8:39 PM

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Re: Photorealistic VR (Path Tracer)

Post by jaybug »

Diorama wrote:
colocolo wrote:yes, octane render is great.
8K would be nice. there is a blog entry about a 17 million triangle human head rendered at 8192x4096 in 8 seconds.
http://raytracey.blogspot.co.nz/2012/12 ... ender.html
On a GTX 680 :woot

I remember overnight render times on my old macintosh in the late 90s, for a single 800x600 raytrace render of a crummy-looking spaceship :lol:

GPU rendering like this has me very excited.
I remember when creating a gradient in photoshop was a spectator event.

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Re: Photorealistic VR (Path Tracer)

Post by Evenios »

meh. i think the cryengine 3 looks better then that.

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Re: Photorealistic VR (Path Tracer)

Post by nixarn »

Here's the latest video from this engine:

http://www.youtube.com/watch?v=pXZ33YoKu9w (Watch it in 720) - Looks amazing!

This should be perfect for the rift, the low resolution of the rift should help boost the the fps!

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Re: Photorealistic VR (Path Tracer)

Post by Paladia »

nixarn wrote:Here's the latest video from this engine:

http://www.youtube.com/watch?v=pXZ33YoKu9w (Watch it in 720) - Looks amazing!

This should be perfect for the rift, the low resolution of the rift should help boost the the fps!
The video runs in a very low fov, low resolution, in 2d and still has way too much noise even with the Titans in SLI they are using. Running it in stereoscopic 3D, higher resolution, >110 FOV as well as interface, AI, textures, physics and so on is still far, far away.

Especially considering they are also using the ideal settings for a raytracer, instanced geometrics. Things like trees on the other hand are killers when it comes to raytracing performance. As the light keeps reflecting on and through every leaf multiple times, reducing the performance to a crawl (or a noise-fest, rather).

So while it will happen sometimes in the future and what they are doing is mightly impressive, don't expect to be running a game with it on the Rift in the near future.

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Re: Photorealistic VR (Path Tracer)

Post by Hermit »

Still only using a skylight. Smaller and more lights will be much slower.

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Re: Photorealistic VR (Path Tracer)

Post by stinkvis »

Path tracing is a very promising technique with lots of future potential, but realistically I don't see it being used in actual games (apart from simple proof of concept demos) anytime soon. SVO cone tracing, on the other hand, is a technique that is capable of producing realistic, non-grainy graphics at medium to high resolution and interactive frame rates right now. I wouldn't be surprised to see something similar being used for games in the near future. Here's a nice video demonstrating the possibilities:
[youtube]http://www.youtube.com/watch?v=fAsg_xNzhcQ[/youtube]

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Re: Photorealistic VR (Path Tracer)

Post by colocolo »

but the engine has a major benefit against rasterization engines.
it can run hundreds of Billions of polys and they theoretically dont have to be instanced . as long as the models fit into the VRAM it would be no problem. thats insane.
this engine has the potential to become the matrix. :D :D :D

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Re: Photorealistic VR (Path Tracer)

Post by STRZ »

Now we only need a good audio engine using a similar approach, with soundwaves bouncing of surfaces in virtual worlds 8-)

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Re: Photorealistic VR (Path Tracer)

Post by nixarn »

Paladia wrote:
nixarn wrote:Here's the latest video from this engine:

http://www.youtube.com/watch?v=pXZ33YoKu9w (Watch it in 720) - Looks amazing!

This should be perfect for the rift, the low resolution of the rift should help boost the the fps!
The video runs in a very low fov, low resolution, in 2d and still has way too much noise even with the Titans in SLI they are using. Running it in stereoscopic 3D, higher resolution, >110 FOV as well as interface, AI, textures, physics and so on is still far, far away.

Especially considering they are also using the ideal settings for a raytracer, instanced geometrics. Things like trees on the other hand are killers when it comes to raytracing performance. As the light keeps reflecting on and through every leaf multiple times, reducing the performance to a crawl (or a noise-fest, rather).

So while it will happen sometimes in the future and what they are doing is mightly impressive, don't expect to be running a game with it on the Rift in the near future.
How do you know the video is running in low res? If it's 720p it's still in higher res than the rift. And why does the FOV matter? And normal game physics are good enough. Also, sure it's under ideal settings, but why not make a rift demo under ideal settings? I'm fine with a city demo with no people as opposed to a forest with AI ppl running around.

I'd want a simple scene, that looks super realistic, shown on the oculus. This seems to get close to that.

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Re: Photorealistic VR (Path Tracer)

Post by virror »

STRZ wrote:Now we only need a good audio engine using a similar approach, with soundwaves bouncing of surfaces in virtual worlds 8-)
Thats already old stuff : p

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Re: Photorealistic VR (Path Tracer)

Post by Evenios »

interesting stuff but as far as one of the videos where everything is grainy and then it renders thats not going to be useful for the Rift right now but some good demos

i don't think were quite there yet and this may still be a year off but once hardware gets better and software gets better too im sure it will happen sooner or later :-).

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Re: Photorealistic VR (Path Tracer)

Post by Alejux »

If I were to bet money, I would say we're still another 5-6 years (3 GPU generations) from having this kind of tech ready for consumer gaming engines.

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Re: Photorealistic VR (Path Tracer)

Post by nanicoar »

The old techniques still don't look quite old.
http://codeflow.org/entries/2012/aug/25 ... e-volumes/

You can run the demo in a browser with WebGL support on a machine with a fairly recent GPU. In the upper right corner you can set the pixel size to 1:1.

The trick behind it is pre-computing a bunch of stuff with 'light probes' which are just white spheres that get illuminated with the ambience. The data is saved and for each render pass the GPU looks up values which actually never change for the scene. It's called a time-space optimization.

Don't know how the scene would deal with animation... yet. I'm stealing everything! ;D

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Re: Photorealistic VR (Path Tracer)

Post by Ben »

stinkvis wrote:SVO cone tracing, on the other hand, is a technique that is capable of producing realistic, non-grainy graphics at medium to high resolution and interactive frame rates right now. I wouldn't be surprised to see something similar being used for games in the near future.
Unreal Engine 4 is already using it for lighting. The guy whose PhD thesis it's based on has a ton of interesting papers on his site.
nanicoar wrote:The trick behind it is pre-computing a bunch of stuff with 'light probes' which are just white spheres that get illuminated with the ambience. The data is saved and for each render pass the GPU looks up values which actually never change for the scene. It's called a time-space optimization.

Don't know how the scene would deal with animation... yet. I'm stealing everything! ;D
Animation works fine, search for spherical harmonic lighting and you should find lots of information.

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Re: Photorealistic VR (Path Tracer)

Post by Paladia »

nixarn wrote:
Paladia wrote:
nixarn wrote:Here's the latest video from this engine:

http://www.youtube.com/watch?v=pXZ33YoKu9w (Watch it in 720) - Looks amazing!

This should be perfect for the rift, the low resolution of the rift should help boost the the fps!
The video runs in a very low fov, low resolution, in 2d and still has way too much noise even with the Titans in SLI they are using. Running it in stereoscopic 3D, higher resolution, >110 FOV as well as interface, AI, textures, physics and so on is still far, far away.

Especially considering they are also using the ideal settings for a raytracer, instanced geometrics. Things like trees on the other hand are killers when it comes to raytracing performance. As the light keeps reflecting on and through every leaf multiple times, reducing the performance to a crawl (or a noise-fest, rather).

So while it will happen sometimes in the future and what they are doing is mightly impressive, don't expect to be running a game with it on the Rift in the near future.
How do you know the video is running in low res? If it's 720p it's still in higher res than the rift. And why does the FOV matter? And normal game physics are good enough. Also, sure it's under ideal settings, but why not make a rift demo under ideal settings? I'm fine with a city demo with no people as opposed to a forest with AI ppl running around.
Because a game is not just a static flat box with just one light source. What they are doing is impressive but it is not close to being ready for a game yet. Tech demos tends to be impressive. Such as this video where a mobile cpu runs raytracing, a smoke particle effect trail and an ocean wave simulator, at the same time. It doesn't mean that you'll be seeing raytracing together with other advanced effects is on a mobile phone anytime soon, however.

If you just want a tech demo. Nothing is stopping you, the engine is open source so go and download it and try it out yourself.

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Re: Photorealistic VR (Path Tracer)

Post by Paintbrush »

Any video/pictures/news from their GDC presentation?

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Re: Photorealistic VR (Path Tracer)

Post by nixarn »

Paladia wrote:
nixarn wrote:
Paladia wrote: The video runs in a very low fov, low resolution, in 2d and still has way too much noise even with the Titans in SLI they are using. Running it in stereoscopic 3D, higher resolution, >110 FOV as well as interface, AI, textures, physics and so on is still far, far away.

Especially considering they are also using the ideal settings for a raytracer, instanced geometrics. Things like trees on the other hand are killers when it comes to raytracing performance. As the light keeps reflecting on and through every leaf multiple times, reducing the performance to a crawl (or a noise-fest, rather).

So while it will happen sometimes in the future and what they are doing is mightly impressive, don't expect to be running a game with it on the Rift in the near future.
How do you know the video is running in low res? If it's 720p it's still in higher res than the rift. And why does the FOV matter? And normal game physics are good enough. Also, sure it's under ideal settings, but why not make a rift demo under ideal settings? I'm fine with a city demo with no people as opposed to a forest with AI ppl running around.
Because a game is not just a static flat box with just one light source. What they are doing is impressive but it is not close to being ready for a game yet. Tech demos tends to be impressive. Such as this video where a mobile cpu runs raytracing, a smoke particle effect trail and an ocean wave simulator, at the same time. It doesn't mean that you'll be seeing raytracing together with other advanced effects is on a mobile phone anytime soon, however.

If you just want a tech demo. Nothing is stopping you, the engine is open source so go and download it and try it out yourself.
I'm fully aware of the difference between a tech demo and a game, thanks. Didn't know it was open source, might just have to try it out then, because all I want is a tech demo.

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Re: Photorealistic VR (Path Tracer)

Post by colocolo »

Brigade 3 is getting faster and faster.
http://raytracey.blogspot.co.nz/
there is an uncompressed video file at the end of the blog entry. 2.4gb.



Sam Lapere said...
colocolo: yes, we're currently only a factor of 10x away from game quality noisefree images in real-time. That means that if we don't do any further algorithmic optimizations, GPU's will have the power to run this at high image quality in 720p in 5 years. But if you take into account that there will be substantial algorithmic and hardware improvements, I think it will be closer to 1.5-2 years from now (for 1080p/30fps).

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Re: Photorealistic VR (Path Tracer)

Post by budda »

Hi,


Guys, you have to keep up with the times. :lol:

'Don't let your dogma become your mantra''.

Euclidion are doing some revolutionary work.

For those who are interested, please see this link and video:

http://www.euclideon.com/videos/euclide ... erse-2013/


Thanks

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Re: Photorealistic VR (Path Tracer)

Post by colocolo »

budda wrote:Hi,


Guys, you have to keep up with the times. :lol:

'Don't let your dogma become your mantra''.

Euclidion are doing some revolutionary work.

For those who are interested, please see this link and video:

http://www.euclideon.com/videos/euclide ... erse-2013/


Thanks
but anyway pixels need to get shaded physically correct.... and ray tracing is the best way for that....
a combination of both technolgies though would be nice...although brigade can handle billions of polygons, at some point RAM get filled up.

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Re: Photorealistic VR (Path Tracer)

Post by DarkAkuma »

Yea. Don't put much faith in Euclideon. Since they've started getting attention a few years ago, they've proven themselves to be a very sketchy company. Say one thing, do another. Show very little of what their engine can do. Make absurd claims (that very well may be true) but backed up with little to no shown fact, often with tech lingo that's used wrong conveying that they're idiots.

The debate for awhile was whether it was a hoax or not. I always thought it was real, and now I think there little doubt that it's real. Although I can't say them ever planning it as a game engine was real. I've found it really shady that they garner so much attention and press from gamers and gaming media, then turn around and do the geoverse thing and not mention a thing about gaming since. (I found 1 reference to the word "game" on their site, but its more of a advertizement). They claim that their gaming engine is on hold cause of the timing with the changing of the console cycle. I guess PC doesn't exist in their world?

But even if they were taking a gaming engine serious, they still have a lot of work to do and prove. Like with lighting and animation. Going with what info we have now, Brigade 3 will look better and WILL happen. Euclideons UD engine just "might happen". About all EUD has going for it is potentially better frame rates on a sooner time frame, since its still not using the GPU.

The EUD tech is interesting, but there's still to little known about it.

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Re: Photorealistic VR (Path Tracer)

Post by Paintbrush »

I think people are too harsh.
Both Euclideon and Brigade 3 are ahead of their time. It's tough to fight against mainstream by creating something that will take quite some time to become advanced enough, to be really useful.
It's true, Brigade has more to show right now and is closer to how we imagine future of graphics could look like. But judging by how Euclideon's working principal is much closer to real-life (small particles/builders that build the world), it has potential.

I think both Euclideons and Brigade 3 are probably at least 10 years away from being excepted as a valid alternative to polygons though.

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Re: Photorealistic VR (Path Tracer)

Post by yoshithedog »

Paintbrush wrote:I think people are too harsh.
Both Euclideon and Brigade 3 are ahead of their time. It's tough to fight against mainstream by creating something that will take quite some time to become advanced enough, to be really useful.
It's true, Brigade has more to show right now and is closer to how we imagine future of graphics could look like. But judging by how Euclideon's working principal is much closer to real-life (small particles/builders that build the world), it has potential.

I think both Euclideons and Brigade 3 are probably at least 10 years away from being excepted as a valid alternative to polygons though.
Isn't path-tracing only for lighting, while the geometry is still polygon-based? If so, could both approaches (voxels+path-tracing) be merged?

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Re: Photorealistic VR (Path Tracer)

Post by colocolo »

brigade uses polygons and unlimited detail polygon converter.
apparently next gen graphics if used sth like a gtx780 will always render higher resolutions as brigade, like 4 times higher. though image quality you can render with a path tracer like brigade 3 is IMO almost lifelike and not reproducable with next gen graphics.

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Re: Photorealistic VR (Path Tracer)

Post by zerax »

Brigade 3 / path tracing blog:
http://raytracey.blogspot.co.nz/

http://www.youtube.com/watch?v=aKqxonOrl4Q

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Re: Photorealistic VR (Path Tracer)

Post by cybereality »

Looks awesome. Can't wait for games to look like that.

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Re: Photorealistic VR (Path Tracer)

Post by cgp44 »

What's the point of ray tracing now? Your average GPUs given an interesting GPU code can do all this.
Ray tracing was for shiny balls before at least three generations of GPU past.

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Re: Photorealistic VR (Path Tracer)

Post by GeraldT »

nope - if you want great shadows and reflections you still need raytracing. and raytracing looks a lot more realistic. they have shown hardware solutions that might get us where we need to soon enough - they are based on hybrid rendering techniques.
want to demo the Rift or check it out? click here

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Re: Photorealistic VR (Path Tracer)

Post by Libertine »

I rarely see games that get that close to real world lighting, those gradients look perfect. GTA 5 comes close and some others. I haven't played Crysis 3, but C2 had many problems with colors and shading.

My assumption of ray tracing has been that it simply does everything you need, automatically, and does so as if it were real light. But that is a very laymen opinion :)
Last edited by Libertine on Sun Mar 23, 2014 2:34 pm, edited 1 time in total.

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Re: Photorealistic VR (Path Tracer)

Post by cgp44 »

Full realistic shadowing is not a priority for VR. Approximation is just fine.
For example, look at that mountain scene in the valley benchmarch of unigine.

What we need as we go for 2k to 4k pixels for VR are lots of polygons
beautifully textured and dynamic movement of them.

Full reflection is another thing that is approximated (be it crappy) by in-scene rendered surfaces.

Any hybrid engine has to deliver lots of surfaces be they polygons or straight pixels.
I don't think ray tracing will scale to 2k @ 75Hz.

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Re: Photorealistic VR (Path Tracer)

Post by GeraldT »

you want more pixels, I like better reflections, shadows and lightning ... why do you get to tell us that what we like is not valid?
want to demo the Rift or check it out? click here

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Re: Photorealistic VR (Path Tracer)

Post by Mystify »

if you don't have more pixels, then all those other things are pointless as you don't have enough detail to convey them.

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Re: Photorealistic VR (Path Tracer)

Post by cgp44 »

Sorry geraldT, VR is going pixels big time, which just demands we get more GPU grunt. So the best means to do this is polygons with the best texturing possible. Is brigade3 even real time? Nothing flashy like skin sub illuminance, just your basic pipeline. There I a lot of fancy GPU code that makes fantastic pictures, but not at 75hz.

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Re: Photorealistic VR (Path Tracer)

Post by PasticheDonkey »

maybe if this could be used with eye tracking and Fovea based rendering it could perform well and look amazing.

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Re: Photorealistic VR (Path Tracer)

Post by colocolo »

ray tracing is so amazing... Now, the Honda in the footage looks just gorgeous. I think we will very likely reach a Matrix like photoreal world in a decade.

https://www.youtube.com/watch?v=4BeqGY2RwcI

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