ImageEffect GlobalFog doesn't work on my customized vert/frag shaders

Unity Engine
1

I wat trying GlobalFog from StandardAssets.ImageEffect but it didn’t work on my customized vert/frag shaders. Some other built-in shaders like Unlit/Color and Unlit/Texture also didn’t work.

I modified GlobalFog.shader to check if the depthTexture is doing its job and it results in all white with customized shader.

Scene

Depth w/ built-in Standard shader

Depth w/ customized shader

I know here’s another option for fog, I was just trying another way around.

Here’s the custom shader.

Adding #pragma multi_compile_fog and marcos like UNITY_APPLY_FOG didn’t change anything in this case. I must missed something …

Shader "Custom/Opaque/NoLit" {
    Properties {
        _MainTex ("Diffuse (RGB)", 2D) = "white" {}
        _ColorEnhance ("Color", Color) = (0,0,0,1)
    }
    SubShader {
        Pass{
            Tags { "Queue"="Geometry" "LightMode" = "ForwardBase" "RenderType"="Opaque"}
            Blend Off
            LOD 80
           
            CGPROGRAM       
            #pragma vertex vs
            #pragma fragment fs       
            #pragma multi_compile_fwdbase
            #pragma skip_variants SHADOWS_SCREEN SHADOWS_NATIVE DIRLIGHTMAP_COMBINED DIRLIGHTMAP_SEPARATE VERTEXLIGHT_ON  
            #include "UnityCG.cginc"
            #pragma target 3.0

            sampler2D _MainTex;
            half4 _MainTex_ST;
            fixed4 _ColorEnhance;
           
            struct VSInput {
                float4 pos         : POSITION0;
                half4 uv_MainTex: TEXCOORD0;
            };
           
            struct FSInput {
                float4 pos   : SV_POSITION;
                half2 uv_MainTex: TEXCOORD0;
            };
           
            FSInput vs(VSInput input)
            {
                FSInput output;
                output.pos = mul(UNITY_MATRIX_MVP, input.pos);
                output.uv_MainTex = TRANSFORM_TEX(input.uv_MainTex, _MainTex);
               
                return output;
            }
           
            fixed4 fs(FSInput input) : COLOR
            {
                return tex2D(_MainTex, input.uv_MainTex) + _ColorEnhance;
            }           
            ENDCG
        }
    }
    FallBack "Unlit/Texture"
}
2

I found out that when I change my fallback shader to Standard or any other shader that make GlobalFog works can make my custom shader work too!

I totally have no idea what’s going on here O_O