Fog of War overlay for overhead map.

Question

Having used the tutorial by Sergey Taraban I have manage to create a working overlay for an overhead map. What I have achieved is as the player explores the world, the area on the map is revealed. I am hoping to refine the shader but lack the understanding for pragma. What I intend to have happen is instead of applying a color to the "Fog of War area" (black portion) apply a texture instead. The current shader code is as follows, the Tutorial can be found at https://www.youtube.com/watch?v=PNAvNeOTnSE. Any help would be appreciated.

Shader "Custom/FogOfWarMask" { Properties { _Color ("Color", Color) = (1,1,1,1) _MainTex ("Albedo (RGB)", 2D) = "white" {} _BlurPower("BlurPower", float) = 0.002 } SubShader{ Tags{ "Queue" = "Transparent" "RenderType" = "Transparent" } Blend SrcAlpha OneMinusSrcAlpha //Lighting off //LOD 200 CGPROGRAM #pragma surface surf Lambert alpha:fade #pragma target 3.0 fixed4 LightingNoLighting(SurfaceOutput s, fixed3 lightDir, float aten) { fixed4 color; color.rgb = s.Albedo; color.a = s.Alpha; return color; }

fixed4 _Color; sampler2D _MainTex; float _BlurPower;

struct Input { float2 uv_MainTex; };

void surf(Input IN, inout SurfaceOutput o) { half4 baseColor1 = tex2D(_MainTex, IN.uv_MainTex + float2(-_BlurPower, 0)); half4 baseColor2 = tex2D(_MainTex, IN.uv_MainTex + float2(0, -_BlurPower)); half4 baseColor3 = tex2D(_MainTex, IN.uv_MainTex + float2(_BlurPower, 0)); half4 baseColor4 = tex2D(_MainTex, IN.uv_MainTex + float2(0, _BlurPower)); half4 baseColor = 0.25 (baseColor1 + baseColor2 + baseColor3 + baseColor4); //o.Albedo = baseColor.rgb; o.Albedo = _Color.rgb baseColor.b; o.Alpha = _Color.a - baseColor.g; } ENDCG } }

Answer 1

Figured it out by combining two shaders together. The end result is as follows.

Shader "Custom/FogOfWarMask" { Properties{ _Color("Color", Color) = (1,1,1,1) _MainTex("Albedo (RGB)", 2D) = "white" {} _BlurPower("BlurPower", float) = 0.002 _PaintTex("Paint Texture (RGBA)", 2D) = "white" {} _BlendAmount("Blend Amount", Range(0.0, 1.0)) = 1.0 } SubShader{ Tags{ "Queue" = "Transparent" "RenderType" = "Transparent" } Blend SrcAlpha OneMinusSrcAlpha //Lighting off //LOD 200

     CGPROGRAM

pragma surface surf Lambert alpha:fade

pragma target 3.0

     fixed4 LightingNoLighting(SurfaceOutput s, fixed3 lightDir, float aten) {
     fixed4 color;
     color.rgb = s.Albedo;
     color.a = s.Alpha;
     return color;
 }

 float _BlurPower;
 fixed4 _Color;
 sampler2D _MainTex;    
 sampler2D _PaintTex;
 fixed _BlendAmount;

 struct Input 
 {
     float2 uv_MainTex;
     float2 uv_PaintTex;
 };

 void surf(Input IN, inout SurfaceOutput o) 
 {    
     half4 baseColor1 = tex2D(_MainTex, IN.uv_MainTex + float2(-_BlurPower, 0));
     half4 baseColor2 = tex2D(_MainTex, IN.uv_MainTex + float2(0, -_BlurPower));
     half4 baseColor3 = tex2D(_MainTex, IN.uv_MainTex + float2(_BlurPower, 0));
     half4 baseColor4 = tex2D(_MainTex, IN.uv_MainTex + float2(0, _BlurPower));
     half4 baseColor = 0.25 * (baseColor1 + baseColor2 + baseColor3 + baseColor4);

     fixed4 paint = tex2D(_PaintTex, IN.uv_MainTex);

     o.Albedo = baseColor.rgb; 
     o.Albedo = lerp((_Color.rgb * baseColor.b), paint, _Color.a * _BlendAmount);
     o.Alpha = _Color.a - baseColor.g;        
 }
 ENDCG
 }

}

Fog of War overlay for overhead map.

1 Reply

pragma surface surf Lambert alpha:fade

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