How to configure a stereo (side-by-side) rendering?

Hello everyone,

I'm trying to configure the Vuforia ARCamera for a stereo (side-by-side) rendering on Windows UWP, but I failed with only mono rendering or black screen.

I've already followed the instructions from the website https://library.vuforia.com/articles/Solution/Working-with-Digital-Eyewear-in-Unity.html. 

[Environment]:

• Software:
  • Unity 2017.3.1f1 Personal (64- bit)
  • Vuforia SDK 7.0.47 => Free Development License Key
  • Windows 10.0.16299
• Hardware:
  • PC/Laptop + Ordinary UVC (USB Video Class) Webcam

I suppose both "Digital Eyewear" and "Phone + Viewer" device types shall have a stereo rendering of my webcam video, but they are all failed. In addition, I don't see any error messages in the Unity Console.

Here are the details,

1. I configure the Digital Eyewear -> Device Type as "Digital Eyewear", and configure the Digital Eyewear -> Device Config as "Vuforia". However, I didn't see a stereo (side-by-side) rendering on "Unity Editor" after pressing the "Play" button. There is only mono screen rendering of my webcam video. It is just like the attached picture (Capture_UnityEditor.png). Besides, the built UWP application is mono screen rending (NOT side-by-side), too.
2. I configure the Digital Eyewear -> Device Type as "Phone + Viewer", and configure the Digital Eyewear -> Viewer Config as "Vuforia", and tried every Digital Eyewear -> "Viewer Type" (Generic Cardboard, VR ONE, VR Googles, C1-Glass, Cardboard v1). However, I still didn't see a stereo (side-by-side) rendering on "Unity Editor" after pressing "Play" button. It is a "black screen". The built UWP application is a black screen, too.

Any hints are very welcome!

Thanks a lot.

Sincerely,

Joe