HJSGProject/FWQJF/Assets/Shader/OutLine.shader

Shader "Unlit/OutLine"
{
  
    Properties
    {
        _Ref("Ref",Float) = 1
        _LineColor("LineColor",Color) = (1,1,1,1)
        _LineWidth("LineWidth",Float) = 1
    }
    SubShader
    {
        Tags{"Queue" = "Transparent" "RenderType" = "Transparent" "IgnoreProjector" = "true"}
        Blend SrcAlpha OneMinusSrcAlpha
        Pass
        {
            ColorMask 0
            ZTest Always
            ZWrite Off
            Stencil
            {
                ref [_Ref]
                Comp Always
                Pass Replace
            }
        }
        
        Pass
        {
            ZWrite Off
            ZTest Always
            Stencil
            {
                ref [_Ref]
                Comp NotEqual
                Pass Replace
            }
            
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"
            
            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
                float3 normal : NORMAL;
            };

            struct v2f
            {
                float2 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
            };

            float _LineWidth;
            float4 _LineColor;

            v2f vert (appdata v)
            {
                v2f o;
                // float4 pos = mul(UNITY_MATRIX_MV, v.vertex); //计算观察空间坐标
                // float3 normal = mul((float3x3)UNITY_MATRIX_IT_MV, v.normal); //法线转到观察空间
                // normal.z = -0.5; //trick：手动把法线z分量设为负值（其实是View空间的z正方向）
                // //尽可能避免背面扩张后的顶点挡住正面的面片
                // pos = pos + float4(normalize(normal), 0) * _LineWidth; //观察空间下，进行法线外扩
                // o.vertex = mul(UNITY_MATRIX_P, pos); //变换到裁切空间
                
                v.vertex = v.vertex + half4(v.normal,1) * _LineWidth;
                o.vertex = UnityObjectToClipPos(v.vertex);
                
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                return _LineColor;
            }
            ENDCG
        }

       
    }
}