Outlined diffuse shader with alpha

Archived Forums Questions & Answers
1

From a group decision to see what our game would look like Cel-shaded, I endeavoured to get hold of a “toon” shader, the current one I’m using is the Outlined diffuse shader 3, however it doesn’t support alpha maps, which are quite important elements of a lot of what we’re doing. Is there a shader out there that does both these things? Drawing thick outlines and using alpha maps? If not, how easy would it be to edit the current shader to utilise them?

2

I just realized how extremely old this post is, but I was trying to do this myself for my projects. I finally got a very close version of it using some other copies on the wiki and merging. With my use it seems almost exactly right and I wanted to share this:

Shader "Outlined/Diffuse Outline With Alpha" {
	Properties {
		_Color ("Main Color", Color) = (.5,.5,.5,1) 
		_OutlineColor ("Outline Color", Color) = (0,0,0,1)
		_Outline ("Outline width", Range (0.0, 0.03)) = .005
		_MainTex ("Base (RGB)", 2D) = "white" { } 
	}
 
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 SrcAlpha OneMinusSrcAlpha 
 
			// 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
		}
 
 		Pass {
			Name "BASE"
			ZWrite On
			ZTest LEqual
			Blend SrcAlpha SrcColor
			Material {
				Diffuse [_Color]
				Ambient [_Color]
			}
			Lighting On
			SetTexture [_MainTex] {
				ConstantColor [_Color]
				Combine texture * constant
			}
			SetTexture [_MainTex] {
				Combine previous * primary DOUBLE
			}
		}
	}
 
	SubShader {
		Tags { "Queue" = "Transparent" }
 
		Pass {
			Name "OUTLINE"
			Tags { "LightMode" = "Always" }
			Cull Front
			ZWrite Off
			ZTest Always
			ColorMask RGB
 
			// 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 exclude_renderers gles xbox360 ps3
			ENDCG
			SetTexture [_MainTex] { combine primary }
		}
 
		Pass {
			Name "BASE"
			ZWrite On
			ZTest LEqual
			Blend SrcAlpha OneMinusSrcAlpha
			Material {
				Diffuse [_Color]
				Ambient [_Color]
			}
			Lighting On
			SetTexture [_MainTex] {
				ConstantColor [_Color]
				Combine texture * constant
			}
			SetTexture [_MainTex] {
				Combine previous * primary DOUBLE
			}
		}
	}
	
	SubShader {
    Tags {"Queue"="Transparent" "RenderType"="Transparent"}
    Blend SrcAlpha OneMinusSrcAlpha
    LOD 200
     
    CGPROGRAM
    #pragma surface surf ToonRamp
     
    sampler2D _Ramp;
     
    // custom lighting function that uses a texture ramp based
    // on angle between light direction and normal
    #pragma lighting ToonRamp exclude_path:prepass
    inline half4 LightingToonRamp (SurfaceOutput s, half3 lightDir, half atten)
    {
    #ifndef USING_DIRECTIONAL_LIGHT
    lightDir = normalize(lightDir);
    #endif
     
    half d = dot (s.Normal, lightDir)*0.5 + 0.5;
    half3 ramp = tex2D (_Ramp, float2(d,d)).rgb;
     
    half4 c;
    c.rgb = s.Albedo * _LightColor0.rgb * ramp * (atten * 2);
    c.a = s.Alpha;
    return c;
    }
     
     
    sampler2D _MainTex;
    float4 _Color;
     
    struct Input {
    float2 uv_MainTex : TEXCOORD0;
    };
     
    void surf (Input IN, inout SurfaceOutput o) {
    half4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
    o.Albedo = c.rgb;
    o.Alpha = c.a;
    }
    ENDCG
     
    }
 
	Fallback "Diffuse"
}