边缘高光实现

Shader "Custom/OutLine1" 
{
    Properties
    {
        _MainTex("main tex",2D) = "black"{}
        _RimColor("rim color",Color) = (1,1,1,1)//边缘颜色
        _RimPower ("rim power",range(1,10)) = 2//边缘强度
    }
 
    SubShader
    {
        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include"UnityCG.cginc"
 
            struct v2f
            {
                float4 vertex:POSITION;
                float4 uv:TEXCOORD0;
                float4 NdotV:COLOR;
            };
 
            sampler2D _MainTex;
            float4 _RimColor;
            float _RimPower;
 
            v2f vert(appdata_base v)
            {
                v2f o;
                o.vertex = mul(UNITY_MATRIX_MVP,v.vertex);
                o.uv = v.texcoord;
                float3 V = WorldSpaceViewDir(v.vertex);
                V = mul(_World2Object,V);//视方向从世界到模型坐标系的转换
                o.NdotV.x = saturate(dot(v.normal,normalize(V)));//必须在同一坐标系才能正确做点乘运算
                return o;
            }
 
            half4 frag(v2f IN):COLOR
            {
                half4 c = tex2D(_MainTex,IN.uv);
                //用视方向和法线方向做点乘，越边缘的地方，法线和视方向越接近90度，点乘越接近0.
                //用（1- 上面点乘的结果）*颜色，来反映边缘颜色情况
                c.rgb += pow((1-IN.NdotV.x) ,_RimPower)* _RimColor.rgb;
                return c;
            }
            ENDCG
        }
    }
    FallBack "Diffuse"
}

Shader "Custom/OutLine2"
{
    Properties
    {
        _MainTex("main tex",2D) = ""{}
        _Factor("factor",Range(0,0.1)) = 0.01//描边粗细因子
        _OutLineColor("outline color",Color) = (0,0,0,1)//描边颜色
    }
 
    SubShader 
    {
        Pass
        {
            Cull Front //剔除前面
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"
 
            struct v2f
            {
                float4 vertex :POSITION;
            };
 
            float _Factor;
            half4 _OutLineColor;
 
            v2f vert(appdata_full v)
            {
                v2f o;
                //v.vertex.xyz += v.normal * _Factor;
                //o.vertex = mul(UNITY_MATRIX_MVP,v.vertex);
 
                //变换到视坐标空间下，再对顶点沿法线方向进行扩展
                float4 view_vertex = mul(UNITY_MATRIX_MV,v.vertex);
                float3 view_normal = mul(UNITY_MATRIX_IT_MV,v.normal);
                view_vertex.xyz += normalize(view_normal) * _Factor; //记得normalize
                o.vertex = mul(UNITY_MATRIX_P,view_vertex);
                return o;
            }
 
            half4 frag(v2f IN):COLOR
            {
                //return half4(0,0,0,1);
                return _OutLineColor;
            }
            ENDCG
        }
 
        Pass
        {
            Cull Back //剔除后面
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"
 
            struct v2f
            {
                float4 vertex :POSITION;
                float4 uv:TEXCOORD0;
            };
 
            sampler2D _MainTex;
 
            v2f vert(appdata_full v)
            {
                v2f o;
                o.vertex = mul(UNITY_MATRIX_MVP,v.vertex);
                o.uv = v.texcoord;
                return o;
            }
 
            half4 frag(v2f IN) :COLOR
            {
                //return half4(1,1,1,1);
                half4 c = tex2D(_MainTex,IN.uv);
                return c;
            }
            ENDCG
        }
    } 
    FallBack "Diffuse"
}

Shader "Custom/OutLine3" 
{
    Properties
    {
        _MainTex("main tex", 2D) = ""{ }
        _OutLineColor("outline color",Color) = (0,0,0,1)//描边颜色
    }
 
    SubShader
    {
        //描边
        pass
        {
            Cull Front
            Offset -5,-1 //深度偏移
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"
 
            sampler2D _MainTex;
            half4 _OutLineColor;
 
            struct v2f
            {
                float4  pos : SV_POSITION;
            };
 
            v2f vert(appdata_base v)
            {
                v2f o;
                o.pos = mul(UNITY_MATRIX_MVP,v.vertex);
                return o;
            }
 
            float4 frag(v2f i) : COLOR
            {
                return _OutLineColor;
            }
            ENDCG
        }
 
        //正常渲染物体
        pass
        {
            //Cull Back
            //Offset 5,-1
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"
 
            sampler2D _MainTex;
            float4 _MainTex_ST;
 
            struct v2f
            {
                float4  pos : SV_POSITION;
                float2  uv : TEXCOORD0;
            };
 
            v2f vert(appdata_base v)
            {
                v2f o;
                o.pos = mul(UNITY_MATRIX_MVP,v.vertex);
                o.uv = TRANSFORM_TEX(v.texcoord,_MainTex);
                return o;
            }
 
            float4 frag(v2f i) : COLOR
            {
                float4 c = tex2D(_MainTex,i.uv);
                return c;
            }
            ENDCG
        }
    }
}