Custom Shader Emits Realtime GI in Editor but not in Build

I have a custom surface shader which emits light using realtime global illumination in 2021.1 with the standard render pipeline. In the editor everything looks correct and the emitted light bounces on to nearby surfaces, however in my built scene there is no bounced light. I have another material using the standard shader which does properly emit light, so the Enlighten system is working in the scene, just not for my shader. Here is a simplified version of my shader with the logic removed for clarity.

Code (CSharp):

1. Shader "Custom/GlowShader"
2. {
3.     Properties
4.     {
5.         [HDR] _EmissionColor ("Emission Color", Color) = (1,1,1,1)
6.         [MaterialToggle] _UseEmission ("Use Emission", float) = 1
7.         [MainTexture] _EmissionMap ("Base (RGB) Trans (A)", 2D) = "white" {}
8.         _AlphaMap ("Alpha Map", 2D) = "white" {}
9.  
10.         _LengthCutoff ("Length Cutoff", Range(0.0, 1.0)) = .97
11.         _Smoothing ("Smoothing", Range(0.1, 15.0)) = 3
12.         _Transparency ("Transparency", Range(0.0, 1.0)) = .2
13.  
14.         _NoiseTex ("Noise Texture", 2D) = "white" {}
15.         _NoiseStrength ("Noise Strength", Range(0.0, 1.0)) = .1
16.     }
17.     SubShader
18.     {
19.         Tags {"Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" "ForceNoShadowCasting"="True"}
20.         LOD 100
21.  
22.         ZWrite Off
23.         Lighting Off
24.         Blend SrcAlpha OneMinusSrcAlpha
25.  
26.         CGPROGRAM
27.         // Physically based Standard lighting model, and enable shadows on all light types
28.         #pragma surface surf Standard noshadow noambient alpha:fade
29.  
30.         // Use shader model 3.0 target, to get nicer looking lighting
31.         #pragma target 3.0
32.  
33.         struct Input
34.         {
35.             float2 uv_MainTex : TEXCOORD0;
36.             float2 uv2_AlphaMap : TEXCOORD1;
37.         };
38.  
39.         sampler2D _EmissionMap;
40.         sampler2D _NoiseTex;
41.         sampler2D _AlphaMap;
42.         float4 _EmissionColor;
43.         float _NoiseStrength;
44.        
45.         float _LengthCutoff;
46.         float _Smoothing;
47.         float _Transparency;
48.         float _UseEmission;
49.  
50.         // Add instancing support for this shader. You need to check 'Enable Instancing' on materials that use the shader.
51.         // See https://docs.unity3d.com/Manual/GPUInstancing.html for more information about instancing.
52.         // #pragma instancing_options assumeuniformscaling
53.         UNITY_INSTANCING_BUFFER_START(Props)
54.             // put more per-instance properties here
55.         UNITY_INSTANCING_BUFFER_END(Props)
56.  
57.         void surf (Input IN, inout SurfaceOutputStandard o)
58.         {
59.             float4 col = tex2D (_EmissionMap, IN.uv_MainTex);
60.             float alpha = 1.0;
61.          
62.             // logic to calculate alpha and emission based on input textures and values
63.             // ...
64.             // ...
65.  
66.             // set output
67.             o.Alpha = alpha;
68.             o.Emission = col.rgb * _EmissionColor * alpha * _UseEmission;
69.             o.Albedo = col.rgb;
70.             o.Metallic = 0.0;
71.             o.Smoothness = 0.0;
72.         }
73.         ENDCG
74.     }
75.     FallBack "Unlit/Transparent"
76. }

Does anyone have any suggestions. Is there something about the way this shader is compiled that makes it work in editor but not in build? Thank you!

 

ok great thank for addressing this!