Mixedrealitytoolkit-unity: Failed to get IHolographicCameraRenderingParameters from main camera for updating rendering parameter.

[CDiaz-MS]

Describe the bug

This error is logged when a hand enters the frame during remoting with HoloLens2.

Failed to get IHolographicCameraRenderingParameters from main camera for updating rendering parameter.

To reproduce

Steps to reproduce the behavior:

1. Install remoting app on HoloLens 2 device
2. Import latest unity foundation and examples packages, open hand interaction examples scene
3. Window > XR > Holographic Emulation, enter ip address displayed through device
4. https://docs.microsoft.com/en-us/windows/mixed-reality/unity-play-mode

Your Setup

• Unity Version 2018.4.13f1
• MRTK Version v2.2

Target Platform

• HoloLens 2 Remoting

[davidkline-ms]

i cannot reproduce this with the latest Windows Mixed Reality package (1.0.15) on Unity 2018.4.13f1

[Troy-Ferrell]

@davidkline-ms / @keveleigh
I can reproduce this on 2019.2.17f1

Looks like maybe Unity bug underneath?
https://docs.microsoft.com/en-us/uwp/api/windows.graphics.holographic.holographiccamerarenderingparameters

[keveleigh]

Spent a bit debugging this. Looks like a Unity issue, possibly caused / exacerbated by any perf cost of hand visualization / remoting. Unfortunately doesn't have an obvious fix that I can see, but I'll keep my eye on it.

[nooxouille]

Hi there! Issue reproduced on Unity 2018.4.18f1 (LTS) + latest MRTK version

[keveleigh]

We've identified a potential fix with Unity. I'll update this thread when I get an expected version number.

[ceitel]

Also reproduced with Unity 2019.3.3f1, no MRTK installed, WMR 4.2.1 package installed

[matware]

Seeing this in 2019.3.6f1 in clean scene with MR toolkit 2.3.0 (no hand mesh) . Also not seeing anything on device, it connects, screen goes black and nothing, but I see a room mesh/camera movement in the scene, so there is data going back to Unity.

Using the new XR plugin management system and the Windows XR Remoting plugin I do get video output, but no hand meshes etc.

Does anybody have Holographic Remoting working reliably with Unity day to day? If so, how?

[keveleigh]

Looking like the fix for this should ship in Unity 2019.3.7 and 2018.4.19.

[nooxouille]

Looking like the fix for this should ship in Unity 2019.3.7 and 2018.4.19.

Nice! Many thanks ;)

[ceitel]

2019.3.7 is now available! (as well as 2018.4.20)
Can confirm the error is gone in 2019.3.7

[matware]

Yay, i finally checked and can also confirm that it work.

[keveleigh]

Closing as fixed in Unity 2019.3.7 and 2018.4.19. Please comment if you're still seeing it in those versions!