Unity Shader 描边

Kapture 2019-04-10 at 23.28.13.gif

Shader "Outlined/Silhouetted Diffuse" {
    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 = UnityObjectToClipPos(v.vertex);
        
        float3 norm   = mul ((float3x3)UNITY_MATRIX_IT_MV, v.normal);
        float2 offset = TransformViewToProjection(norm.xy);
        
        // o.pos.xy +=   _Outline;
        o.pos.xy += offset * _Outline;
        o.color = _OutlineColor;
        return o;
    }
    ENDCG
    
    SubShader {
        Tags { "Queue" = "Transparent" }
        
        // note that a vertex shader is specified here but its using the one above
        Pass {
            Name "OUTLINE"
            Tags { "LightMode" = "Always" }
            Cull Off
            ZWrite Off
            ZTest Always
            ColorMask RGB // alpha not used
            
            // you can choose what kind of blending mode you want for the outline
            Blend SrcAlpha OneMinusSrcAlpha // Normal
            
            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 OneMinusSrcAlpha

            Material {
                Diffuse [_Color]
                Ambient [_Color]
            }
            Lighting On
            SetTexture [_MainTex] {
                ConstantColor [_Color]
                Combine texture * constant
            }
            SetTexture [_MainTex] {
                Combine previous * primary DOUBLE
            }
        }
    }
    
    
    Fallback "Diffuse"
}