[BUG] The image displayed on left eye is with significant deviation as right eye with URP used.

[Hanning-Liu]

Describe the bug

The canvas buttons are not displayed correctly on both eyes of HoloLens2 when the URP used.
And the image is very laggy.
The left eye will become fully white and the right eye can not see anything when the custom renderer feature is used.

To reproduce

1. Install MRTK3, and OpenXR using MRTK feature tool
2. install URP from unity package manager
3. configure the MRTK remoting settings
4. Hit the play button to start holographic remoting with HoloLens 2
5. Add the Canvas and buttons from the Hierachy window
6. See the images displayed on HoloLens on device, or through the Game "Preview" window in Unity (Turn on both Eyes setting)

Expected behavior

Images on both eyes are displaying the same images and being not laggay.
Works well with custom renderer feature of URP.

Screenshots

2024-04-13.21-57-02.mp4

Your setup (please complete the following information)

• Unity Version 2021.3.34f1c1
• MRTK Version or Commit
  

Target platform (please complete the following information)

• HoloLens 2 with Holographic Remoting App being used
• Unity Version 2021.3.34f1c1
• MRTK3
• OpenXR
• URP 12.1.13

[BenediktTobias]

Usually a simple restart of the project fixes that shader issue that may occur directly after installing URP. If the issue still persists after a restart, try to rebuild Unity's shader cache.
To do this simply delete [ProjectName]/Library/ShaderCache and restart your project.

[AMollis]

@Hanning-Liu what shaders are you using? Is everything in you're scene using shaders from the Mixed Reality Graphic Tools? https://github.com/microsoft/MixedReality-GraphicsTools-Unity

[Hanning-Liu]

Hi @AMollis. Thank you for your reply!
I used custom shader in this tutorial: https://www.youtube.com/watch?v=LMqio9NsqmM, I want to implement a mesh outline effect which is good to use.
As for Mixed Reality Graphic Tools, I've tried it, but the effect is nor good enough. You can look through this issue: microsoft/MixedReality-GraphicsTools-Unity#209

[AMollis]

@Hanning-Liu thank you for the issue you've reported. Unfortunately, this is not a bug in the MRTK3.

The issue is likely with your custom sharer. It's likely your OpenXR project is setup with Single Pass instance rendering.

You can attempt to switch to "Mutli-pass" to confirm. However, it's highly recommended to use "single pass instancing" for the best performance. In which case you need to update your shader to support "single-pass instance". If you have further questions, please post in the discussion forum.