3D Vision Blog

A normal user's look into the world of 3D Stereo Technologies

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Testing the New GeForce Experience ShadowPlay Beta Feature

November 21st, 2013 · 6 Comments · GeForce 3D Vision


ShadowPlay is an extra functionality that allows the owners of compatible Nvidia Kepler-based graphic cards to take advantage of the built-in H.264 encoder to record gameplay video with hardware acceleration directly into small in size MP4 video files. ShadowPlay is a part of the GeForce Experience software that now comes as a part of the Nvidia video drivers, and although it is still in Beta stage it looks quite promising. And while ShadowPlay was introduced last month with the release of the GeForce Experience 1.7 software I still haven’t been able to try the software, but now I can and since Nvidia just released a new GeForce 331.82 WHQL video driver that comes with an update to GeForce Experience 1.7.1 it is time to try out this feature. Aside from the new version of the Geforce Experience software the new video drivers also come with a 3D Vision profile for the game Assassin’s Creed IV: Black Flag and it is rated as “Good” for playing in stereo 3D with 3D Vision setups.


Looking at the ShadowPlay interface you can easily see that it is designed with the normal users in mind, by providing you with a simple and easy to understand clickable buttons for configurations. But more advanced users like me will miss some simple things like an option to remap the default ALT + F9 key combination for manual start/stop of the recording for example or an option to control the recording resolution or framerate and so on. Hopefully Nvidia is going to add some more extra controls for the more advanced users as well with upcoming updates.

What I still haven’t mentioned regarding ShadowPlay is if ti supports recording of stereoscopic 3D gameplay videos as this is something that people playing on 3D Vision setups actually do need and can appreciate. Officially before the release of the ShadowPlay feature Nvidia did not say that it will have stereo 3D support, and now that the software is available still no official 3D Vision support. The good news is that ShadowPlay can actually already record stereo 3D gameplay videos, but with one important thing to note – the 3D video you get is also in 1920×1080 resolution meaning that it is essentially recorded in Half Side by Side format (half horizontal resolution per eye). Not that this is a bad thing compatibility wise, but it would’ve been nice if the user can select between Half SbS mode and Full Side by Side (maybe limitation of the hardware H.264 encoder?). FRAPS for example as the only other gameplay video capture software with stereoscopic 3D video recording support does only output in Full Side by Side format, but the major problem with FRAPS is that the video output is hardly compressed and recording 3D video does result in a lot of gigabytes per minute of recording.

So to summarize things, the ShadowPlay feature is apparently intended for gameplay video recording of 2D gameplay, though it also supports 3D gameplay video recording in Half Side by Side format meaning that the two views are squashed in a single Full HD frame and FRAPS on the other hand produces Full Side by Side output when recording stereoscopic 3D video. ShadowPlay does output small H.264 compressed video files that are ready for online sharing, unlike FRAPS that produces multi-gigabyte files for each minute of recorded footage and recording 3D makes the files even bigger, s you need to re-compress them before uploading and sharing them. The performance drop when using ShadowPlay should be significantly less, because the hardware H.264 encoder of the video card is used to compress and output small files, unlike FRAPS where the CPU handles the minimal compression applied and the HDD/SSD needs to handle the serious load caused by the large amounts of data written each second, so the performance drop is more significant. FRAPS has more features and more controls for the more advanced users while maintaining ease of use by the normal user as compared to the way too user friendly and somewhat lacking features interface of the ShadowPlay.

And now for some tests of ShadowPlay and a comparison with FRAPS when both are set to record video at 1080p 60 fps in various conditions in the game Battlefield 4. The game was chosen because it can be quite heavy even for the fastest GPUs when you up the graphical settings to the maximum as in the current case – Ultra Quality with 4xMSAA with a GeForce GTX 780 Ti video card. Battlefield 4 is not recommended by Nvidia to be played in stereoscopic 3D mode with 3D Vision, but it is still Ok for benchmarks and recording, so take a look at the interesting results below.

2D mode:
– 96 fps in 2D mode playing with 3D Vision disabled in the Control Panel
– 90 fps in 2D mode with ShadowPlay recording and 3D Vision disabled in the Control Panel
– 51 fps in 2D mode recording video with FRAPS and 3D Vision disabled in the Control Panel

3D mode:
– 69 fps in 2D mode playing with 3D Vision enabled in the Control Panel, but turned off
– 38 fps in stereo 3D mode with 3D Vision enabled and running
– 36 fps in stereo 3D mode with ShadowPlay recording video
– 25 fps in stereo 3D mode with FRPAS recording video on an SSD drive

File size:
– FRAPS 1 min 2D – 2.8 GB
– FRAPS 1 min 3D – 4.4 GB
– ShadowPlay 1 min high 2D/3D ~ 112 MB (varies based on the content)

As you can see from the results above, by using ShadowPlay you get to loose much less FPS compared to when recording video with FRAPS and also the output video’s file size can be significantly less. Aside from that you can probably notice that Battlefield 4 does not handle that well performance wise with 3D Vision enabled, even when it is not active you still get significant performance drop as compared to normal 2D mode and that is probably half the reason why the game has a Not Recommended rating for 3D Vision and the other half is the visual issues when rendering in stereo 3D mode.

And one interesting observation that I made while testing was the fact that as long as 3D Vision is activated from the Nvidia Control Panel then when you record gameplay video with ShadowPlay you are getting a stereo 3D recording in Half Side by Side format, regardless if you have pressed CTRL+T to enable or disable the display of 3D data on the screen. So you need to be careful when you want to play and record gameplay video in 2D mode you will have to disable the 3D Vision stereoscopic 3D support form the Control Panel before running the game and for recording stereo 3D gameplay video the good thing is that you may not actually play in stereo 3D mode while recording in it.

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The Gimpel3D 2D to 3D Stereo Conversion Software is Now Open Source

November 20th, 2013 · No Comments · 2D to 3D Conversion


I’ve introduced the free Gimpel3D manual 2D to 3D stereo conversion software here on the blog back in 2011, and now the author has made it an open source software by releasing the code of the project on Sourceforge. Gimpel3D is a free application that can help you convert a single 2D image or image sequence into stereoscopic 3D written by René Gimpel. The conversion to 3D is manual and the software only assists you, so do not expect automation like with an 2D to 3D autoconversion solutions that do everything with just a click of a button, with Gimpel3D however you can get much better results.

Since the original freeware release of Gimpel3D, many of the ideas presented in the software have become standard features in commercial software and as a result the author of the program has decided that there is no significant advantage to continue developing it as a stand-alone proprietary solution, although the codebase makes a nice platform for future research and experimentation. René Gimpel has released all source code for G3D under the GPL so that other stereo researchers, hobbyists, and/or professionals can build upon his existing work, and integrate/test new capabilities using the projective modeling environment.

For more information or to download the source code or the free Gimpel3D software…

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BenQ XL2720Z, a New 3D Vision-ready and 144Hz 2D Gaming Monitor

November 20th, 2013 · 2 Comments · GeForce 3D Vision


Earlier this month BenQ has announced their new monitor XL2720Z, the first 27-inch gaming monitor that BenQ releases with support for 144Hz refresh rate as their previous model XL2720T was up to 120Hz. BenQ XL2720Z is also 3D Vision ready, though when using it in stereoscopic 3D mode you are being limited to 120Hz (60Hz per eye) like with other 144Hz 3D-capable models. And while the 3D Vision compatibility also comes with 3D LightBoost technology support that can help improving the brightness level in stereo 3D mode and also help reduce motion blur in 2D mode, BenQ has also introduced a new Motion Blur Reduction technology of their own that essentially does what 3D Lightboost does – strobing backlight, but BenQ’s solution does not require “software hacks” to work like you may need to do to enable Nvidia’s 3D Lightboost for motion blur reduction. It will be interesting to see how will BenQ’s blur reduction solution will compare to Nvidia’s 3D Lightboost approach that was originally designed for stereo 3D use. Other interesting things about the BenQ XL2720Z is a new Low Blue Light mode that allows gamers to adjust the blue light levels of the monitor that is considered to be the cause of eyestrain for example when using computers for long periods of time. Another new feature introduced a this monitor is the Gaming-comfort Flicker-free technology that is supposed to eliminate noticeable flickering of the backlight when you lower the brightness level of the monitor (no PWM dimming of the backlight).

If you want to be able to use the BenQ XL2720Z for stereoscopic 3D gaming you would need to get a pair of 3D Vision glasses with IR emitter kit, as they are not bundled, and BenQ’s target is probably not stereo 3D gamers, but 2D gamers interested in the higher refresh rate. Unfortunately this monitor does not feature the recently announced G-Sync technology from Nvidia, so if you are looking for a new gaming monitor you might want to wait a bit more for the first G-Sync enabled monitors to come out (probably early next year). BenQ is one of the partners of Nvidia for the G-Sync technology along with Asus, Philips and ViewSonic. By the end of the year Nvidia is supposed to start offering the Nvidia G-SYNC Do-it-yourself upgrade kits for owners of the ASUS VG248QE monitors. So now may not be the best time to go for the BenQ XL2720Z, unless you don’t care about the elimination of screen tearing, input lag, and stutter that Nvidia’s G-Sync technology promises. If your interest is mostly in the new BenQ Motion Blur Reduction technology, then you might also want to check out the EIZO Foris FG2421 gaming monitor that also features similar strobing backlight technology helping eliminate motion blur, but Eizo also has a VA-type LCD and not a TN panel like on this BenQ display.

For more information about the BenQ XL2720Z 3D Vision and 144Hz 2D gaming monitor…

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