Added imported package from book

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Assets/_Materials/Shields.psd.meta

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Assets/_Materials/UnlitAlpha.shader

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+Shader "ProtoTools/UnlitAlpha"
+{
+    Properties
+    {
+        _Color ("Main Color", Color) = (1,1,1,1)
+        _MainTex ("Base (RGB) Trans. (Alpha)", 2D) = "white" { }
+    }
+
+    Category
+    {
+        ZWrite On
+		Blend SrcAlpha OneMinusSrcAlpha
+        SubShader
+        {
+        Tags { "Queue" = "Transparent" }
+            Pass
+            {
+            	ZWrite Off
+   			    Cull Off
+                Lighting Off
+				SetTexture [_MainTex]
+				{
+					constantColor [_Color]
+					Combine texture * constant, texture * constant 
+				} 
+                
+            }
+        } 
+    }
+}

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