It seems that a problem occurs when building after installing the USD package on URP.

[KimHyunBeom]

First of all, please understand that this was written through a translator.

I am using version 2022.3.10f, and I have noticed an issue where the following build error continues to occur when installing the USD package when creating a project with URP.

error CS0234: The type or namespace name 'BaseShaderGUI' does not exist in the namespace 'UnityEditor'(are you missing an assembly reference?)

It seemed that a problem related to UnityEditor continued to occur in UrpShaderImporter.cs, the script that caused the error, so I added the following code to the bottom and was able to solve the problem.

// Remove compile errors when URP package not installed
#if URP_AVAILABLE
#if UNITY_EDITOR   //What I added
            UnityEditor.BaseShaderGUI.SetupMaterialBlendMode(mat);
#endif
#endif

I don't know if this can be a fundamental solution. The version used was 3.0.0-exp.5, but the same problem continued to occur starting with 3.0.0-exp.4.

[SoftwareMechanic]

Hello!
I am facing the same issue, I also tried to add '#if UNITY_EDITOR' similarly to what @KimHyunBeom has done, but whenever unity recompiles, the script returns as it was before compilation and I can not build.
Basically I think that the issue happens because this script is contained in a "Runtime" folder, but it is referencing 'UnityEditor' namespace, do you have a workaround for this issue?

Keep up the good work guys ✌️

[KimHyunBeom]

hi! @SoftwareMechanic First of all, I've experienced that problem too, and the solution is simple.

When I edit the code and return to Unity, compilation proceeds and I return to the previous code. But the point here is that if I edit the script once more and save it, I don't know why, but the script does not return to its original state even after compilation.

[michaeljblain]

Hi
We recommend trying out our new USD packages released earlier this week (announcement).
The build error should no longer occur when using those packages.