NVIDIA Works: ANSEL & VRWorks Audio

Along with the various hardware aspects of Pascal, NVIDIA’s software teams have also been working on new projects to coincide with the Pascal launch. These are a new screenshot tool, and a new audio simulation package based on path traced audio.

We’ll start with NVIDIA’s new screenshot utility. Dubbed ANSEL, after famous American environmental photographer Ansel Adams, ANSEL is a very different take on screenshots. Rather than taking screenshots from the player’s perspective at the game rendering resolution, ANSEL allows for an entire scene to be captured at a far higher resolution than with standard screenshots. NVIDIA is pitching this as an art tool rather than a gaming tool, and I get the impression that this is one of those pie-in-the-sky kind of ideas that NVIDIA’s software group decided to run with in order to best show off Pascal’s various capabilities.

At its core, ANSEL is a means to decouple taking screenshot from the limitations of the player’s view. In an ANSEL-enabled application, ANSEL can freeze the state of the game, move the camera around, and then generate a copious amount of viewports to take screenshots. The end result is that ANSEL makes it possible to generate an ultra-high resolution 360 degree stereo 3D image of a game scene. The analogy NVIDIA is working towards is dropping a high quality 360 degree camera into a game, and letting users play with it as they see fit.

But even this isn’t really a great description of ANSEL, as there isn’t anything else like it to compare it to. Some games have offered 360 degree capture, but they haven’t done so at any kind of resolution approaching what ANSEL can do. And this still doesn’t touch features such as HDR (FP16) scene capture or the free camera.

Under the hood, ANSEL is at times a checklist for Pascal technologies (though it does work with Maxwell 2 as well). In order to capture scenes at a super high resolution, it forces a scene to its maximum LOD and breaks it down into a number of viewports, implemented efficiently using SMP. To demonstrate this technology NVIDIA put together a 4.5Gpix image rendered out of The Witcher 3, which was composed of 3600 such viewport tiles. Meanwhile stitching together the individual tiles is a CUDA based rendering process, which uses overlapping tiles to resolve any tone mapping conflicts. Finally, ANSEL captures images before they’re actually sent to a display, grabbing HDR images (in EXR format0 in games that support HDR.

Meanwhile given its level of deep interaction with games, ANSEL does require individual game support to work. This is in the form of a library provided by NVIDIA, which helps ANSEL and NVIDIA’s driver make sense of a scene and pause the simulation when necessary. Unsurprisingly, NVIDIA is eager to get ANSEL into more games – it just launched on Mirror’s Edge: Catalyst – and as a result is touting to developers that ANSEL is easy to implement, having taken only 150 lines of code on The Witcher 3.

Ultimately NVIDIA seems to be throwing ANSEL at the wall here to see what sticks. But it should be neat to see what users end up doing with the technology,

VRWorks Audio

Not to be outdone by the ANSEL team, other parts of NVIDIA’s software group has been working on a slightly different kind of project for NVIDIA: audio. As a GPU company, NVIDIA has never been deeply involved with audio (not since getting out of the chipset business, at least), but with the current focus on VR, they are taking a crack at it in a new way.

VRWorks Audio is the latest library as part of NVIDIA’s larger VRWorks suite. As given away by the name, this library is focused on audio, specifically for VR. In a nutshell, VRWorks is a full audio simulation library, using path tracing to power the simulation. The goal of VRWorks Audio is to provide a realistic sound simulation for VR, to further increase the apparent realism.

Under the hood, VRWorks audio leverages NVIDIA’s existing OptiX path tracing technology. Only rather than tracing light it’s used to trace sound waves. Along with simulating audio propagation itself – including occlusion and reverb – VRWorks Audio is also able to run the necessary Head Related Transfer Functions (HRTFs) to reduce the simulation down to binaural audio for headphones.

All of this is, of course, executed on Pascal’s CUs in a manner similar to path tracing or PhysX, running alongside the main graphics rendering thread. The amount of processing power required for VRWorks Audio can vary considerably depending on the detail desired (particularly the number of reflections); for NVIDIA’s VR Funhouse demo, VR Works audio can occupy most of a GPU on its own.

Ultimately, unlike some of the other technologies presented by NVIDIA, VRWorks Audio is in a relatively early stage. As a result while NVIDIA is shipping the SDK, there aren’t any games that are announced to be using it at this time, and if it gets any traction it’ll be farther into the future before we see the first games using it. That said, NVIDIA is already reaching out to the all-important middleware vendors on the subject, and to that end their own VR Funhouse demo is using FMOD with a VRWorks Audio plugin to handle the sound, demonstrating that they already have VRWorks Audio working with the popular audio middleware.

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  • Eidigean - Wednesday, July 20, 2016 - link

    Excellent article Ryan.

    Will you be writing a followup article with tests of two GTX 1080's in SLI with the new high-bandwidth dual bridge?

    Looking specifically for these tests in SLI:
    3x 2560x1440 (7680x1440)
    3x 1920x1080 (5760x1080)

    Hoping the latter two tests would include with and without multi-projection optimizations.
  • Ryan Smith - Wednesday, July 20, 2016 - link

    "Will you be writing a followup article with tests of two GTX 1080's in SLI with the new high-bandwidth dual bridge?"

    It's on the schedule. But not in the near term, unfortunately. GPU Silly Season is in full swing right now.
  • big dom - Wednesday, July 20, 2016 - link

    I agree with the previous reviewers. It's fine and dandy to be a "day one" breakthrough reviewer and believe me I read and enjoyed 20 of those other day 1 reviews as well. But... IMO no one writes such an in depth, technical, and layman-enjoyable review like Anandtech. Excellent review fellas!

    This is coming from a GTX 1070 FE owner, and I am also the other of the original Battleship Mtron SSD article.

  • big dom - Wednesday, July 20, 2016 - link

    *author Reply
  • jase240 - Wednesday, July 20, 2016 - link

    I don't understand why in your benchmarks the framerates are so low. For example I have a 1070 and am able to play GTAV at very high settings and achieve 60fps constant at 4K.(No MSAA obviously)

    Even other reviewers have noted much higher framerates. Listing the 1080 as a true 4K card and the 1070 as a capable 4K card too.
  • Ryan Smith - Wednesday, July 20, 2016 - link

    It depends on the settings.

    The way I craft these tests is settings centric. I pick the settings and see where the cards fall. Some other sites have said that they see what settings a card performs well at (e.g. where it gets 60fps) and then calibrate around that.

    The end result is that the quality settings I test are most likely higher than the sites you're comparing this article to.
  • jase240 - Wednesday, July 20, 2016 - link

    Ah now I see why, you have the advanced graphics settings turned up also. These are not turned on by default in GTAV since they cause great performance loss.

    Extended Distance Scaling, Extended Shadows Distance, Long Shadows, High Resolution Shadows, High Detail Streaming While Flying.

    They eat a lot of VRAM and perform terribly at higher resolutions.
  • sonicmerlin - Thursday, July 21, 2016 - link

    And I'm guessing add very little to overall picture quality. Reply
  • Mat3 - Wednesday, July 20, 2016 - link

    I think there's something wrong with your Fury X in a couple of your compute tests. How's it losing to a Nano? Reply
  • masouth - Wednesday, July 20, 2016 - link

    I know the article was posted today but when was it actually written? NewEgg has been having the dual fan Gigabyte GTX 1070 at $399 for a couple weeks now. Yes, it's still $20 over the MSRP and frequently sells out as quick as they show up but it's still a fair deal cheaper than $429. Reply

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