Nvidia’s new FCAT VR tool will help quantify virtual reality performance



Nvidia
at the Game Developers Conference this week announced a new frame
capture analysis tool for virtual reality. Dubbed FCAT VR, the utility
is designed to help VR developers, reviewers and enthusiasts analyze the
quality and performance of a virtual reality experience.

Traditional
benchmark utilities aren’t all that practical when it comes to virtual
reality. Zvi Greenstein, general manager of Nvidia’s GeForce team who
also leads business development for VR at the company, notes in a recent
blog post
that traditional measurement tools like FRAPS only measure what’s
happening on the desktop monitor instead of what’s happening on the VR
headset.

In other words, they focus squarely on frame rate and
don’t take other important metrics into account like latency, stutter
and hitching – all of which can have a big impact on the virtual reality
experience. If stutter and latency fall below a certain threshold, for
example, they can cause motion sickness – not fun.

FCAT VR, which
supports the Oculus Rift and HTC Vive, is said to provide a
comprehensive performance measurement for frame time and stutter on the
headset without requiring special external capture equipment.

The tool captures four key performance metrics:

  • Frame Time
    — Since FCAT VR provides detailed timing, it’s possible to measure the
    time it takes to render each frame. The lower the frame time, the more
    likely it is that the app will maintain a frame rate of 90 frames per
    second needed for a quality VR experience. Measurement of frame time
    also allows an understanding of the PC’s performance headroom above the
    90 fps VSync cap employed by VR headsets.
  • Dropped Frames
    — Whenever the frame rendered by the VR game arrives too late for the
    headset to display, a frame drop occurs. It causes the game to stutter
    and increases the perceived latency which can result in discomfort.
  • Warp Misses
    — A warp miss occurs whenever the runtime fails to produce a new frame
    (or a re-projected frame) in the current refresh interval. The user
    experiences this miss as a significant stutter.
  • Synthesized Frames
    — Asynchronous Spacewarp (ASW) is a process that applies animation
    detection from previously rendered frames to synthesize a new, predicted
    frame. If FCAT VR detects a lot of ASW frames, we know a system is
    struggling to keep up with the demands of the game. A synthesized frame
    is better than a dropped frame, but isn’t as good as a rendered frame.

Nvidia’s new utility should be available to download by mid-March.

via Blogger http://www.droidadda.org/2017/03/nvidias-new-fcat-vr-tool-will-help.html https://mtkdr0id.files.wordpress.com/2017/03/42b2f-2017-03-03-image-9.jpg?w=300

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