Create Diffuse (2 Sided Light).shader

Author: unitycoder

Assets/Shaders/2D/Sprites/Diffuse (2 Sided Light).shader

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+// Unity built-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt)
+// lights up sprites from both sides
+
+Shader "Sprites/Diffuse (2 Sided Light)"
+{
+	Properties
+	{
+		[PerRendererData] _MainTex("Sprite Texture", 2D) = "white" {}
+		_Color("Tint", Color) = (1,1,1,1)
+		[MaterialToggle] PixelSnap("Pixel snap", Float) = 0
+		[HideInInspector] _RendererColor("RendererColor", Color) = (1,1,1,1)
+		[HideInInspector] _Flip("Flip", Vector) = (1,1,1,1)
+		[PerRendererData] _AlphaTex("External Alpha", 2D) = "white" {}
+		[PerRendererData] _EnableExternalAlpha("Enable External Alpha", Float) = 0
+	}
+
+		SubShader
+		{
+			Tags
+			{
+				"Queue" = "Transparent"
+				"IgnoreProjector" = "True"
+				"RenderType" = "Transparent"
+				"PreviewType" = "Plane"
+				"CanUseSpriteAtlas" = "True"
+			}
+
+			Cull Off
+			Lighting Off
+			ZWrite Off
+			Blend One OneMinusSrcAlpha
+
+			CGPROGRAM
+			//#pragma surface surf Lambert vertex:vert nofog nolightmap nodynlightmap keepalpha noinstancing
+			#pragma surface surf TwoSidedLambert vertex:vert nofog nolightmap nodynlightmap keepalpha noinstancing
+			#pragma multi_compile_local _ PIXELSNAP_ON
+			#pragma multi_compile _ ETC1_EXTERNAL_ALPHA
+			#include "UnitySprites.cginc"
+
+			struct Input
+			{
+				float2 uv_MainTex;
+				fixed4 color;
+			};
+
+			// added "abs" 2 sided lighting
+			half4 LightingTwoSidedLambert(SurfaceOutput s, half3 lightDir, half atten) {
+				half NdotL = abs(dot(s.Normal, lightDir));
+				half4 c;
+				c.rgb = s.Albedo * _LightColor0.rgb * (NdotL * atten);
+				c.a = s.Alpha;
+				return c;
+			}
+
+			void vert(inout appdata_full v, out Input o)
+			{
+				v.vertex = UnityFlipSprite(v.vertex, _Flip);
+
+				#if defined(PIXELSNAP_ON)
+				v.vertex = UnityPixelSnap(v.vertex);
+				#endif
+
+				//v.normal.z *= -1;
+
+				UNITY_INITIALIZE_OUTPUT(Input, o);
+				o.color = v.color * _Color * _RendererColor;
+			}
+
+			void surf(Input IN, inout SurfaceOutput o)
+			{
+				fixed4 c = SampleSpriteTexture(IN.uv_MainTex) * IN.color;
+				o.Albedo = c.rgb * c.a;
+				o.Alpha = c.a;
+			}
+			ENDCG
+		}
+
+			Fallback "Transparent/VertexLit"
+}