何が起きたか

Meta Quest Pro と MRTKv2 を組み合わせて環境構築したところ下記のエラーが発生。

Shader error in 'Mixed Reality Toolkit/Standard': Non system-generated input signature parameter () cannot appear after a system generated value. at line 775 (on ges3)

解消方法

Assets/MRTK/Shaders/MixedRealityStandard.shader を以下のように変更

MixedRealityStandard.shader:755行目

- fixed4 frag(v2f i, fixed facing : VFACE) : SV_Target
+ fixed4 frag(v2f i, bool facing : SV_IsFrontFace) : SV_Target

MixedRealityStandard.shader:956行目

- worldNormal = normalize(worldNormal) * facing;
+ worldNormal = normalize(worldNormal) * (facing ? 1.0 : -1.0);

MixedRealityStandard.shader:959行目

- worldNormal = normalize(i.worldNormal) * facing;
+ worldNormal = normalize(i.worldNormal) * (facing ? 1.0 : -1.0);

参考サイト

確認環境

Unity 2021.3.9f1
Mixed Reality Toolkit Examples 2.8.3
Mixed Reality Toolkit Extensions 2.8.3
Mixed Reality Toolkit Foundation 2.8.3
Mixed Reality Toolkit Standard Assets 2.8.3
Oculus XR Plugin 3.0.2
Oculus Integration SDK 49.0