Question Apply Stereo Rendering to Camera Render Texture in VR and URP

Hi,

I'm trying to achieve a portal effect in VR using Camera Render Texture and URP.

It's almost working, but the Render Texture when viewed in the Headset is blurry, I guess it's because the Single Pass Stereo Rendering is not applied to the screen position and left and right eyes are not rendered as it should.

I found a reddit thread explaining how to apply in shader graph the code from the Unity documentation on stereo rendering.

But as soon as I do it, the render texture is just plain white.

Here is the custom function that should do the job :

Code (CSharp):

1. void PixelShaderFunction_float(float2 uv, out float2 vruv)
2. {
3.  
4. float4 scaleOffset = unity_StereoScaleOffset[unity_StereoEyeIndex];
5.  
6. vruv.xy = uv.xy * (scaleOffset.xy + scaleOffset.zw);
7.  
8. }

The sub graph using it :


The Shader displaying the Render Texture by using the subgraph instead of the classic Screen Position :


Would you have an idea on why it fails?

Thanks,
Thomas