Question URP : Using Shader Graph for skybox in VR

Is it possible to use shader graph to make a skybox texture for a VR camera? My attempt works in scene view and game view until I hit play, the game view basically removes the skybox and renders nothing for the skybox. See the images below. Any help would be appreciated!

 

have the same problem. i put a scene together for bugReport , but then found online:
issue #1328062 and probably related #1299691

 

I found a solution to this for anyone still struggling with it. Export the URP shader to code, and add Zclip False where the other shader render options are. This solved the problem for me.

I found the solution here: https://forum.unity.com/threads/hls...x-shader-with-single-pass-instancing.1234660/

 

@TheBlatantOne
Thank you very much! Your solution works.
it's not as convenient as doing it through shadergraph - leaves some work for the unity team

 

It seems shader graph has updated itself to now have a few other blockers. Just changing one line in the generated code didn't work. So I lost interest and just wrote my shader from code.

If you want a super basic code shader that works with URP skyboxes, here's a sample to use as a starting point:

Code (CSharp):

1.  
2. Shader "Skybox/Minimal"
3. {
4.     Properties
5.     {    
6.         _TopOTheWorld("TopOTheWorld", Color) = (0.3, 0.6, 1, 1)
7.         _Bottom("Bottom", Color) = (0.3,0.3,0.3, 1)
8.     }
9.     SubShader
10.     {
11.         Tags { "Queue"="Background" "RenderType"="Background" "PreviewType"="Skybox" }
12.         Cull Off ZWrite Off
13.  
14.         Pass {
15.             CGPROGRAM
16.             #pragma vertex vert
17.             #pragma fragment frag
18.  
19.             #include "UnityCG.cginc"
20.          
21.             uniform half3 _TopOTheWorld;
22.             uniform half3 _Bottom;
23.  
24.             struct appdata_t
25.             {
26.                 float4 vertex : POSITION;
27.                 UNITY_VERTEX_INPUT_INSTANCE_ID
28.             };
29.  
30.             struct v2f
31.             {
32.                 float4  pos              : SV_POSITION;
33.                 float3  posWS            : TEXCOORD0;
34.             };
35.          
36.             v2f vert (appdata_t v)
37.             {
38.                 v2f OUT;
39.                 UNITY_SETUP_INSTANCE_ID(v);
40.                 UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);
41.                 OUT.pos = UnityObjectToClipPos(v.vertex);
42.                 OUT.posWS = mul((float3x3)unity_ObjectToWorld, v.vertex.xyz);
43.                 return OUT;
44.             }
45.             half4 frag (v2f IN) : SV_Target
46.             {
47.                 float3 normPos = normalize(IN.posWS);
48.                 float val = smoothstep(-0.1, 0.2, normPos.y);
49.                 half3 col = lerp(_Bottom, _TopOTheWorld, val);
50.  
51.                 return half4(col,1.0);
52.             }
53.             ENDCG
54.         }
55.     }
56. }
57.  

 

I try the shader that @gamedevbill post. But have a error when building.

Error building Player: Shader error in 'Skybox/Minimal': invalid subscript 'stereoTargetEyeIndex' at line ## (on gles3)

Just insert the macros that in Unity single-pass custom shader document
Here is the fixed shader:

Code (CSharp):

1. Shader "Skybox/GradientSkybox"
2. {
3.     Properties
4.     {  
5.         _TopOTheWorld("TopOTheWorld", Color) = (0.3, 0.6, 1, 1)
6.         _Bottom("Bottom", Color) = (0.3,0.3,0.3, 1)
7.     }
8.     SubShader
9.     {
10.         Tags { "Queue"="Background" "RenderType"="Background" "PreviewType"="Skybox" }
11.         Cull Off
12.         ZWrite Off
13.         Pass {
14.             CGPROGRAM
15.             #pragma vertex vert
16.             #pragma fragment frag
17.             #include "UnityCG.cginc"
18.        
19.             uniform half3 _TopOTheWorld;
20.             uniform half3 _Bottom;
21.             struct appdata_t
22.             {
23.                 float4 vertex : POSITION;
24.  
25.                 // https://docs.unity3d.com/2021.3/Documentation/Manual/SinglePassInstancing.html
26.                 UNITY_VERTEX_INPUT_INSTANCE_ID
27.             };
28.             struct v2f
29.             {
30.                 float4  pos              : SV_POSITION;
31.                 float3  posWS            : TEXCOORD0;
32.  
33.                 // https://docs.unity3d.com/2021.3/Documentation/Manual/SinglePassInstancing.html
34.                 UNITY_VERTEX_OUTPUT_STEREO
35.             };
36.        
37.             v2f vert (appdata_t v)
38.             {
39.                 v2f OUT;
40.  
41.                 // https://docs.unity3d.com/2021.3/Documentation/Manual/SinglePassInstancing.html
42.                 UNITY_SETUP_INSTANCE_ID(v);
43.                 UNITY_INITIALIZE_OUTPUT(v2f, OUT);
44.                 UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);
45.              
46.                 OUT.pos = UnityObjectToClipPos(v.vertex);
47.                 OUT.posWS = mul((float3x3)unity_ObjectToWorld, v.vertex.xyz);
48.                 return OUT;
49.             }
50.             half4 frag (v2f IN) : SV_Target
51.             {
52.                 float3 normPos = normalize(IN.posWS);
53.                 float val = smoothstep(-0.1, 0.2, normPos.y);
54.                 half3 col = lerp(_Bottom, _TopOTheWorld, val);
55.                 return half4(col,1.0);
56.             }
57.             ENDCG
58.         }
59.     }
60. }