Question Cameras target texture(output texture) gets morphed when rotating camera in VR

Hello, I've been following brackys portal video, only I'm trying to do it in VR on the quest 2.

The issue I have is when I'm turning my head the portal texture get morphed as seen in the video

I've noticed that removing this shader, made in shader graph, there is no more morphing, so I assume that the fault is in this shader:

 

(I've created portals before but I've gone at it a little more complex, so to the best of my knowledge: )

Try adding a Tracked Pose Driver to the second camera (this will make the second camera render for vr).
Haven't seen all the tutorial, but it might be useful to instead use Camera.CopyFrom to get the other scene cameras to render the exact same as the VR camera.

If this does not work, take a look at Single Pass Stereo rendering (Double-Wide rendering): https://docs.unity3d.com/Manual/SinglePassStereoRendering.html
In VR (Single Pass), the render texture is actually twice as wide as a normal render texture (left and right eye). There is a section in this link (Adding Single Pass Stereo rendering support to Shaders) that guides through how to convert normal UV to double-wide UVs when sampling in shaders, but I'm not sure if this is still a problem when rendering with shader graph

 

Thanks for the reply. I tried adding the Tracked Pose Driver, but it didn't change anything. So I tried editing the shader script from Brakeys video by following your provided link, but without any change to the texture morphing. I'm still very new to the shader thing, so I'm not sure I did it correctly, but here's the shader code

Code (CSharp):

1. // Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
2.  
3. Shader "Unlit/ScreenCutoutShader"
4. {
5.     Properties
6.     {
7.         _MainTex ("Texture", 2D) = "white" {}
8.     }
9.     SubShader
10.     {
11.         Tags{ "Queue" = "Transparent" "IgnoreProjector" = "True" "RenderType" = "Transparent" }
12.         Lighting Off
13.         Cull Back
14.         ZWrite On
15.         ZTest Less
16.      
17.         Fog{ Mode Off }
18.  
19.         Pass
20.         {
21.             CGPROGRAM
22.             #pragma vertex vert
23.             #pragma fragment frag
24.          
25.             #include "UnityCG.cginc"
26.  
27.             struct appdata
28.             {
29.                 float4 vertex : POSITION;
30.                 float2 uv : TEXCOORD0;
31.             };
32.  
33.             struct v2f
34.             {
35.                 //float2 uv : TEXCOORD0;
36.                 float4 vertex : SV_POSITION;
37.                 float4 screenPos : TEXCOORD1;
38.             };
39.  
40.             v2f vert (appdata v)
41.             {
42.                 v2f o;
43.                 o.vertex = UnityObjectToClipPos(v.vertex);
44.                 o.screenPos = ComputeScreenPos(o.vertex);
45.                 return o;
46.             }
47.  
48.          
49.             sampler2D _MainTex;
50.             half4 _MainTex_ST;
51.  
52.             fixed4 frag(v2f i) : SV_Target
53.             {
54.                 i.screenPos /= i.screenPos.w;
55.          
56.                 fixed4 col = tex2D(_MainTex, UnityStereoScreenSpaceUVAdjust(float2(i.screenPos.x, i.screenPos.y), _MainTex_ST));
57.              
58.  
59.                 return col;
60.             }
61.             ENDCG
62.         }
63.     }
64. }
65.  

.
I also have another script that creates and adds a texture to the material :

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class PortalTextureSetup : MonoBehaviour
6. {
7.     public Camera cameraB;
8.     public Material cameraMatB;
9.  
10.     void Start()
11.     {
12.  
13.         if(cameraB.targetTexture != null)
14.         {
15.             cameraB.targetTexture.Release();
16.         }
17.  
18.         cameraB.targetTexture = new RenderTexture(Screen.width, Screen.height, 24);
19.         cameraMatB.mainTexture = cameraB.targetTexture;
20.      
21.     }
22.  
23.  
24. }
25.  

Also from what I understand, the current Oculus integration version that I'm using has Singel Pass Stereo Rendering under a different name called Multiview.

 

This is because the ScreenPosition node doesn't take in consideration XR rigs properly. I am trying to achieve the same here https://forum.unity.com/threads/trying-to-get-an-hdrp-portal-to-work-on-vr.1017616/#post-7418981
I have opened a support issue to get it corrected, but it may take a while.
I'll let you know when the bug tracker ticket will be created, so be sure to upvote the tracker issue with your vote if you want it to get corrected faster.

 

So as promised here is the link with the issue if you want to upvote it to get corrected : https://issuetracker.unity3d.com/is...position-node-does-not-work-when-xr-is-active