Question Shader property doesn't work from instanced prefab from asset bundle.

I'm having a problem getting a shader property to work on an object that I instanced prefab from an asset bundle. The same shader works when the object is dragged directly into the scene via the prefab without the asset bundle.

As shown below, the shader is just a simple standard shader with a emission overlay to give it a glowing effect:

Code (CSharp):

1. Shader "Custom/SurfaceGlow"
2. {
3.     Properties
4.     {
5.         _Color ("Color", Color) = (1,1,1,1)
6.         _MainTex ("Albedo (RGB)", 2D) = "white" {}
7.         _Glossiness ("Smoothness", Range(0,1)) = 0.5
8.         _Metallic ("Metallic", Range(0,1)) = 0.0
9.         _BumpMap ("Bumpmap", 2D) = "bump" {}
10.         _Emission ("Glow Color", Color) = (0.0,1.0,0.0,1.0)
11.         _GlowStr ("Glow Strength", Range(0.0,1.0)) = 0
12.     }
13.     SubShader
14.     {
15.         Tags { "RenderType"="Opaque" }
16.         LOD 200
17.  
18.         CGPROGRAM
19.         // Physically based Standard lighting model, and enable shadows on all light types
20.         #pragma surface surf Standard fullforwardshadows
21.  
22.         // Use shader model 3.0 target, to get nicer looking lighting
23.         #pragma target 3.0
24.  
25.         sampler2D _MainTex;
26.         sampler2D _BumpMap;
27.  
28.         struct Input
29.         {
30.             float2 uv_MainTex;
31.             float2 uv_BumpMap;
32.             float3 viewDir;
33.         };
34.  
35.         half _Glossiness;
36.         half _Metallic;
37.         fixed4 _Color;
38.         float4 _Emission;
39.         float _GlowStr;
40.  
41.         // Add instancing support for this shader. You need to check 'Enable Instancing' on materials that use the shader.
42.         // See https://docs.unity3d.com/Manual/GPUInstancing.html for more information about instancing.
43.         // #pragma instancing_options assumeuniformscaling
44.         UNITY_INSTANCING_BUFFER_START(Props)
45.             // put more per-instance properties here
46.         UNITY_INSTANCING_BUFFER_END(Props)
47.  
48.         void surf (Input IN, inout SurfaceOutputStandard o)
49.         {
50.             // Albedo comes from a texture tinted by color
51.             fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
52.             o.Albedo = c.rgb;
53.             o.Normal = UnpackNormal(tex2D(_BumpMap, IN.uv_BumpMap));
54.             half glow;
55.  
56.             if(_GlowStr == 0)
57.             {
58.                 glow = 1.0;              
59.             }          
60.             else
61.             {
62.                 glow = 1.0 - saturate(dot(normalize(IN.viewDir), o.Normal));
63.             }
64.  
65.             o.Emission = _Emission.rgb * pow(_GlowStr, glow);          
66.             o.Metallic = _Metallic;
67.             o.Smoothness = _Glossiness;
68.             o.Alpha = c.a;          
69.         }
70.         ENDCG
71.     }
72.     FallBack "Diffuse"
73. }
74.  

I have a simple material for a gameobject using this shader.

When I drag the prefab directly into the scene, whether the game is running or not, I select the prefab object with the material and set the slider controls, the material glows as intended. So I know the shader works:



but when the object from an asset bundle containing the prefab, and I do the same by selecting the instanced game object and setting its material directly, the slider does nothing:



My goal is to set the glow value by script during runtime, but I'm unable to do so because the instanced object ignores the setting in the shader, even when I directly select the instance game object and set its material property directly in-game with the slider.

What am I overlooking here? Thanks in advance for your help.

 

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