Custom ShaderGraph shader in skybox breaks single pass instanced rendering

Running a plain vanilla project in Unity 2020.3.0f1 with URP version 10.3.2. I created a simple gradient shader in shadergraph and set it as the skybox material in the example scene.

Here's the shader:

On both an Oculus Rift S and Quest 2 via Link, it works fine on multipass rendering but as soon as I switch to single pass instanced I get this:



URP version 7.5.2 seems to not have this problem. Is this a known issue?

EDIT: Also verified this happens on Unity 2021.1.2f1 and URP 11.0.0. Looks like it first broke in URP 10.1.0

 

Have you found a fix? I've been running into this as well and been having a difficult time finding a solution, this is one of the first threads I've come across that's a 100% replica of my issue.

Switching Stereo Rendering Mode to Multi-pass under XR Plug-in Management > OpenVR seems to work like you noted. Though this shouldn't have to be the only solution, as Single Pass Instanced is much more performant.

 

Any updates on this? I am having this issue as well.

 

bump

 

Also bumping this, this single bug prevents any custom skybox from working in VR without switching to Multi-pass VR rendering

 

Bump

Edit: Found another thread with a similar problem. https://forum.unity.com/threads/hls...x-shader-with-single-pass-instancing.1234660/ looks like your skybox shader is zclipping due to incorrect scaling while using single pass instancing, disabling zclipping for your skybox shader should fix it (it did in my case). I hope this gets fixed in a future release of URP

 

I see, really appreciate the heads up! However, how would you apply this fix for a skybox shader made with shadergraph?

 

Bump

Still haven't found a good solution, bug remains

 

If shadergraph has zwrite/ztest options you can change it there. If it does not, you can always export it as a .shader file and add them in yourself. Look up the unity docs for ztest and zwrite, its easy to add in.