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XR Elite - Passthrough Underlay not working


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I've been migrating a Unity MR project from Open XR to WAVE SDK to make use of VUT's

So far so good, however I cannot get Passthrough Underlay working at all, Passthrough Overlay works fine though?

My code is below:

using UnityEngine;
using Wave.Native;
    public class PassthroughUnderlay : MonoBehaviour

    private void Start()
    void ShowPassthroughUnderlay()
            Interop.WVR_ShowPassthroughUnderlay(true); //Show Passthrough Underlay

Switching Underlay with Overlay makes the code work and activates the Overlay - but I need Underlay. I have my Camera Background set to Transparent Black as per the documentation: https://hub.vive.com/storage/app/doc/en-us/UnityXR/UnityXRPassthrough.html

I have the VIVE WAVE, Native and Essence packages enabled, the passthrough doesn't even work on the included passthrough demo, again only the overlay works

Many Thanks,


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