Outline for selected objects

Assets/Outlined-Silhouette Only.shader

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+Shader "Outlined/Silhouette Only" {
+	Properties {
+		_OutlineColor ("Outline Color", Color) = (0,0,0,1)
+		_Outline ("Outline width", Range (0.0, 0.03)) = .005
+	}
+ 
+CGINCLUDE
+#include "UnityCG.cginc"
+ 
+struct appdata {
+	float4 vertex : POSITION;
+	float3 normal : NORMAL;
+};
+ 
+struct v2f {
+	float4 pos : POSITION;
+	float4 color : COLOR;
+};
+ 
+uniform float _Outline;
+uniform float4 _OutlineColor;
+ 
+v2f vert(appdata v) {
+	// just make a copy of incoming vertex data but scaled according to normal direction
+	v2f o;
+	o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
+ 
+	float3 norm   = mul ((float3x3)UNITY_MATRIX_IT_MV, v.normal);
+	float2 offset = TransformViewToProjection(norm.xy);
+ 
+	o.pos.xy += offset * o.pos.z * _Outline;
+	o.color = _OutlineColor;
+	return o;
+}
+ENDCG
+ 
+	SubShader {
+		Tags { "Queue" = "Transparent" }
+ 
+		Pass {
+			Name "BASE"
+			Cull Back
+			Blend Zero One
+ 
+			// uncomment this to hide inner details:
+			//Offset -8, -8
+ 
+			SetTexture [_OutlineColor] {
+				ConstantColor (0,0,0,0)
+				Combine constant
+			}
+		}
+ 
+		// note that a vertex shader is specified here but its using the one above
+		Pass {
+			Name "OUTLINE"
+			Tags { "LightMode" = "Always" }
+			Cull Front
+ 
+			// you can choose what kind of blending mode you want for the outline
+			//Blend SrcAlpha OneMinusSrcAlpha // Normal
+			//Blend One One // Additive
+			Blend One OneMinusDstColor // Soft Additive
+			//Blend DstColor Zero // Multiplicative
+			//Blend DstColor SrcColor // 2x Multiplicative
+ 
+CGPROGRAM
+#pragma vertex vert
+#pragma fragment frag
+ 
+half4 frag(v2f i) :COLOR {
+	return i.color;
+}
+ENDCG
+		}
+ 
+ 
+	}
+ 
+	Fallback "Diffuse"
+}