How do I change the AR camera so it displays in two images (stereo)?

Question

I am developing a AR prototype in Unity that recognises targets and displays animated models on them. I want to use this prototype with google cardboard, therefore I need it to work in stereo camera.

I tried to change the Device Type in AR camera inspector > Vuforia Engine Configuration > Digital Eyewear, from ¨handheld¨ to ¨phone + viewer¨. (I am following what is done in this tutorial https://www.youtube.com/watch?v=qZzhXHqXM-g)

When I do this, everything stays the same (camera doesn´t change to stereo) and a black background called Backgroundplane shows up when I am in play mode, so I can´t see the real environment anymore.

Any ideas what may cause this or how could I do it differently?

Many thanks in advance!

Screenshots:

Inspector ¨phone+viewer¨

play mode Backgroundplane

Answer 1

Problem solved: the issue was in the player configuration.

I solved it following this path, I leave the link here for anyone with the same issue: https://medium.com/adventures-in-ar/converting-a-handheld-unity-vuforia-project-to-one-with-stereographic-view-on-a-headset-f646a7a86a11

Answer 2

Create 2 empty game objects and name them Cam1 and Cam2. Add a camera game object to both. Settings for cameras.

Camera 1 (foreground): Depth: 1 Clear flag: Depth only

Camera 2 (background): Depth: 0 Clear Flag: Solid Color

Now just point camera 1 at the stuff you want in the foreground and point camera 2 at the background or whatever configuration you want.