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Assets/Particles/BulletExplosion/BulletExplosion_Shader.shader

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+Shader "Unlit/BulletExplosion_Shader"
+{
+    Properties
+    {
+		_Rad1("Radius 1", Range(0, 1))=1
+		_Rad2("Radius 2", Range(0, 1))=0.1
+		_Density("Density", Range(0, 1))=1
+		[HDR]
+		_Col1("Start color", Color)=(1, .55, 0, 1)
+		[HDR]
+		_Col2("End color", Color)=(1, 0, 0, 1)
+    }
+    SubShader
+    {
+		Tags { "RenderType" = "Transparent" "Queue" = "Transparent" }
+		Cull Off
+		Blend SrcAlpha One
+		ZWrite Off
+		LOD 100
+
+        Pass
+        {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+            // make fog work
+            #pragma multi_compile_fog
+
+            #include "UnityCG.cginc"
+			#include "include.cginc"
+
+            struct appdata
+            {
+                float4 vertex : POSITION;
+				float4 normal : NORMAL;
+				float4 color : COLOR;
+                float4 uv : TEXCOORD0;
+
+            };
+
+            struct v2f
+            {
+				float4 vertex : SV_POSITION;
+                float2 uv : TEXCOORD0;
+				float age : TEXCOORD1;
+				float4 color : COLOR;
+				float colorModulation : TEXCOORD2;
+            };
+
+            sampler2D _Texture;
+            float4 _Texture_ST;
+
+			float _Rad1;
+			float _Rad2;
+			float _Density;
+			float4 _Col1;
+			float4 _Col2;
+
+            v2f vert (appdata v)
+            {
+                v2f o;
+                o.vertex = UnityObjectToClipPos(v.vertex);
+				o.color = v.color;
+				o.uv = v.uv.xy;
+				o.age = v.uv.z;
+				o.colorModulation = v.uv.w;
+                return o;
+            }
+
+            fixed4 frag (v2f i) : SV_Target
+            {/*
+                fixed4 tex = tex2D(_Texture, i.uv);
+
+				float mask = lerp(tex.b+tex.g, tex.g, i.age);
+				float4 col =  tex.g*lerp(_Col1, _Col2, i.age) + tex.b*_Col2;
+
+				col *= mask;
+				col.a *= i.color.a;*/
+
+				_Rad2 = i.age;
+				_Rad2 = 1 - pow(1 - _Rad2, 3);
+
+
+				float radialMask1 = 1-smoothstep(_Density/2, .5, length( 1/_Rad1*(i.uv - 0.5f)));
+				float radialMask2 = 1-smoothstep(_Density/2, .5, length(1/_Rad2*(i.uv - 0.5f)));
+				float donutMask = radialMask1 - radialMask2;
+
+				float t = i.colorModulation;
+				
+				float4 color = donutMask * lerp(_Col1, _Col2, t);
+
+				return fixed4(color);;
+            }
+            ENDCG
+        }
+    }
+}