Fog.shader

gistfile1.txt

Shader "Custom/Fog"
{
    Properties
    {
        _Color ("Color", Color) = (1,1,1,1)
        _MainTex ("Texture", 2D) = "white" {}
        _NoiseTex ("NoiseTexture", 2D) = "white" {}
    }
    SubShader
    {
        Tags { "Queue"="Transparent" "RenderType"="Transparent" }
        LOD 100

        Pass
        {
            ColorMask RGBA
            ZWrite On
            ZTest Always
            Blend SrcAlpha OneMinusSrcAlpha 
        
            CGPROGRAM
            #pragma vertex vert alpha
            #pragma fragment frag

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct v2f
            {
                float2 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
            };

            sampler2D _MainTex;
            sampler2D _NoiseTex;
            float4 _MainTex_ST;
            fixed4 _Color;
           

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                fixed4 outColor = _Color;

                // sample the texture
                fixed4 c = tex2D(_MainTex, i.uv + fixed2(0.002, -0.004));
                fixed4 c1 = tex2D(_MainTex, i.uv + fixed2(0.004, 0.007));
                fixed4 c2 = tex2D(_MainTex, i.uv + fixed2(-0.006, 0.005));
                fixed4 c3 = tex2D(_MainTex, i.uv + fixed2(-0.004, -0.004));
                fixed4 c4 = tex2D(_MainTex, i.uv + fixed2(-0.003, -0.006));

                fixed4 noise = tex2D(_NoiseTex, i.uv * 4  + fixed2(0.02,0.02) * _Time / 2) + 0.05;

                float noiseK = (noise.r * 5 + noise.g + noise.b) / 7;

                float result = noiseK - (c.r + c.g + c1.r + c1.g + c2.r + c2.g + c3.r + c3.g + c4.r + c4.g) / 10;
                
                outColor.a = result > 0.5 ? clamp(result * 1.15, 0.7, 1)  : result > 0.15 ? result * 1.3 : 0;
                
                return outColor;
            }
            ENDCG
        }
    }
}