URP Scriptable Render Feature produces missing vertex descriptor attribute error with Metal API

Graphics Render Pipelines
, ,
1

(MacOS Ventura, Apple Silicon, 2021.3.19f1, URP)

I am creating a volume-dependent postprocess shader which has two passes in it. Unfortunately, I am not seeing the effect at all. Everything compiles without errors. I enter and exit the box volume, also, without errors (at least, ones dependent on entering/exiting the box volume)

However, I got the following error, which occurs exactly twice, after each new compilation, and doesn’t occur after that:

I am unable to get the error to occur again without recompiling the shader. I do know that I am not seeing my effect whatsoever. The error only seems to occur twice with each compilation.

These are what I’m using for my appdata and v2f structs:

struct appdata
{
    float4 positionOS : Position;
    float2 uv : TEXCOORD0;
};

struct v2f
{
    float4 positionCS : SV_Position;
    float2 uv : TEXCOORD0;
};

Looking it up, it seems that there might be some fundamental quirk with how Unity handles the Metal API which may require more in-depth alterations than what I can do from within Unity. I am hoping that that is not the case, however.

What can I do to avoid this error or change the shader (likely) to bypass this? Perhaps some kind of addition to my appdata or v2f struct?

2

Any updates, here? From what I gather, the error I’m getting is a fundamental bug with 2021.3.19f1 and that it was fixed with 2021.3.26, so I’m downloading that. Other than that, no further info exists about this problem.

3

hi, I encountered a similar problem when studying shaders, it’s not funny, but try replacing
“float4 positionOS : Position;” vs “float4 positionOS : POSITION;”
and
" float4 positionCS : SV_Position;" vs “float4 positionCS : SV_POSITION;”

https://docs.unity3d.com/Packages/com.unity.render-pipelines.universal@8.2/manual/writing-shaders-urp-basic-unlit-structure.html