[BUG] MRTK URP support for Unity 2021 (URP 12.1.12+)

[paulio]

MRTK URP support for Unity 2021 (URP 12.1.12+)

Installing MRTK in a Unity 2021 project that is using URP incorrectly produces invisible materials. When the MRTK Standard opaque shader is applied the material is incorrectly invisible. The problem is not seen in Unity 2020 projects. The problem occurs for both MRTK v2 and v3.

To reproduce

Steps to reproduce the behavior:

1. Create an Unity 2021 project using the URP (3D) Template
2. Using the MRTK feature tool add the standard set of assets and the Shader examples.
3. Use the MRTK Upgrade URP Materials tool menu (if using v2)
4. Once the install is complete view the Shader Material examples or create a new opaque material using the MRTK Standard shader
5. Note that you cannot see the resulting material in either the preview or when the material is applied to a mesh (e.g. a simple cube)

Expected behavior

The Shader should display the color as stipulated in the shader settings

Screenshots

Expected (from Unity 2020)

Unity 2021
MRTK 2

MRTK 3

Your setup (please complete the following information)

• Unity Versions
  2021.3.29f1
  2020.3.42 (used to produce the working examples)
• MRTK Version
  MRTK2 2.8.3
  MRKT3 3.0.0-pre18

Target platform (please complete the following information)

• HoloLens 2

Additional context

Add any other context about the problem here.

[AMollis]

@paulio can you please open this bug against the Mixed Reality Graphics Tools.

https://github.com/microsoft/MixedReality-GraphicsTools-Unity

This Graphic Tools is currently a stand-alone project still maintained by the Microsoft organization.

[paulio]

Thanks, FYI microsoft/MixedReality-GraphicsTools-Unity#189