Video capture (3D not 360) for stereoscopic goggles

Hi,

I'm designing an fMRI experiment and I created a virtual environment with Unity3d 2017.3 that I would like to screen to the participants in the scanner using stereoscopic goggles. I'm quite new to C# and Unity, so I figured out that the simplest way for me was to capture videos of this environment, so I can play them later to the participants, (without delays, in a timed manner, using Matlab).
Given that I use "old-school" stereoscopic goggles (basically two low resolution screens, one for each eye), I need to capture stereo videos, not in 360, but just in "flat" mode, like at a movie theater (for example left-right 2048*768 or top-bottom 1024*1536), that would keep the 3D depth. For now I just have one main camera for the scene.

I've seen a lot of assets (also the new Unity 2018.1 feature) capturing 360 stereo videos but so far I didn't find any dealing with also non-360 stereo videos. I tried VR Capture from RockVR (free version), with the following parameters:
- Format: Normal
- Stereo format: Left-right
- Stereo format type: Full
- inter-pupillary distance: 0.0635
- no dedicated camera

But what it seems to me to do is capturing one video from the main camera and then duplicate it a second time for the second eye, so it's not "real" stereo and doesn't give me 3D videos at the end. But maybe I'm using it wrong?
Is there somebody that have experience with this or know an asset that does this particular job?
Do I have to set two different cameras (one for each eye) instead of just one main camera, and then try to capture from the two of them?

Sorry if my post is not precise enough, it's my first post, and of course I would be happy to complete any missing piece of info.

Thanks in advance for the help!
Antonin

 

Yes, if you want actual stereo video, I see no alternative to using a stereo camera.

I've heard good things about the Lenovo Mirago camera.

 

Thanks for the answer! Sorry I was not talking about an actual physical camera, but the one in the Unity3D editor. I need to record some scene of the virtual environment I modeled with Unity3D, when in editor mode.

 

Hi there!

You can do this using Unity Recorder from AssetStore

https://assetstore.unity.com/packages/essentials/beta-projects/recorder-94079

Create two cameras in your scene, and set position of the second one to 0.0665 (ideally create a virtual camera rig with parent at 0 and two child cameras set half the IP to both sides, you can then make fly animations on parent and it'll keep stereo)

Then use their viewport rects to get your stereo format i.e for top bottom

CamL
X = 0 / Y = 0
W = 1 / H = 0.5
CamR
X = 0 / Y = 0.5
W = 1 / H = 0.5

Remember to also set the display ratio for your desired resolution, then simply open the Recorder asset window and hit record.

[edit]
img does not display, here's the url
https://pasteboard.co/HtN8Tgm.png

 

Thanks for the help! I will try that and get back to you.

 

Does exactly what I wanted! Thanks again!

 

Hi
This is something I could really do with using as I have a Unity system that I am desiging to streamline animation film making. There's an occasional need to record stereoscopic video (anaglyph) for use with traditional 3d glasses (red/cyan).
Could you explain a little clearer how to implement the camera(s). I currently use a single cam with Unity Recorder with Capture set to game view. I'm mildly confused on how to set it up.
Nvidia drivers no longer support 3D output so I can't go that way.

Many thanks
Archie