init

Assets/Materials/Bullet/Bullet_Shader.shader

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+Shader "Unlit/Bullet_Shader"
+{
+    Properties
+    {
+		_Color1("Color 1", Color)=(1, 1, 1, 1)
+		_Color2("Color 2", Color)=(1, 0, 0, 1)
+		_BorderWidth("Border width", Range(0, 1))=.1
+		_FlickerSpeed("Flicker speed", Float)=0
+		_Stripes("Stripes", Float)=0
+    }
+    SubShader
+    {
+        Tags { "RenderType"="Transparent" "Queue"="Transparent+1" }
+		
+		Blend SrcAlpha OneMinusSrcAlpha
+		ZWrite Off
+
+        LOD 100
+
+        Pass
+        {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+            // make fog work
+            #pragma multi_compile_fog
+
+            #include "UnityCG.cginc"
+
+            struct appdata
+            {
+                float4 vertex : POSITION;
+                float2 uv : TEXCOORD0;
+            };
+
+            struct v2f
+            {
+                float2 uv : TEXCOORD0;
+                UNITY_FOG_COORDS(1)
+                float4 vertex : SV_POSITION;
+            };
+
+			float _BorderWidth;
+			float4 _Color1;
+			float4 _Color2;
+
+			//zigzag
+			float _FlickerSpeed;
+
+			//waves
+			float _Stripes;
+
+            v2f vert (appdata v)
+            {
+                v2f o;
+                o.vertex = UnityObjectToClipPos(v.vertex);
+				o.uv = v.uv;;
+                UNITY_TRANSFER_FOG(o,o.vertex);
+                return o;
+            }
+
+            fixed4 frag (v2f i) : SV_Target
+            {
+				float2 centeredUV = i.uv - 0.5f;
+
+				float radialMask = 1-smoothstep(0.495f, 0.505f, length(centeredUV));
+				float colorModulation = step(_BorderWidth/2, length(centeredUV));
+
+				//zigzag
+				colorModulation = lerp(1-colorModulation, colorModulation, step(0, sin(_Time.y*_FlickerSpeed)));
+
+				//waves
+				if (_Stripes != 0) {
+					float distanceField = abs((length(centeredUV*_Stripes)) - _Time.y) % 1;
+					distanceField = min(0.9, distanceField);
+					colorModulation = colorModulation + (1 - colorModulation)*distanceField;
+				}
+				/*colorModulation = smoothstep(0, 1 / _Stripes, colorModulation);
+				colorModulation = min(0.9f, colorModulation);*/
+
+				float4 col = lerp(_Color1, _Color2, colorModulation);
+				col.a *= radialMask;
+
+				//return colorModulation.xxxx;
+                return col;
+            }
+            ENDCG
+        }
+    }
+}