Unity 猫眼效果

使用到了两层Shader，依据先后遮挡关系判定渲染。

1.Cull Back.shader

// Upgrade NOTE: replaced '_World2Object' with 'unity_WorldToObject'
// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'

Shader "Cull/Back" 
{
    Properties
    {
        _MainTex("_MainTex",2D)="white"{}
        _Diffuse("Diffuse",Color)=(1,1,1,1)
    }
    SubShader
    {
        Pass
        {
            //Tags{"Queue"="Geometry+200"}

            //ZWrite Off
            ZTest Greater 


            CGPROGRAM
            #pragma vertex vert 
            #pragma fragment frag
            #include "Lighting.cginc"

            fixed4 _Diffuse;
            sampler2D _MainTex;
            fixed4 _MainTex_ST;

            struct a2v
            {
                float4 vert:POSITION;
                float2 uv:TEXCOORD0;
            };

            struct v2f
            {
                float4 pos:SV_POSITION;
                float2 uv:TEXCOORD1;
            };

            v2f vert(a2v v)
            {
                v2f o;
                o.pos=UnityObjectToClipPos(v.vert);
                o.uv =v.uv;
                return o;
            }

            fixed4 frag(v2f i): SV_Target
            {
                fixed4 texCol=tex2D(_MainTex,i.uv);
                return fixed4(texCol);
            }
            ENDCG
        }
    }
    FallBack "Diffuse"
}

2.Cull Front.shader

// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'

Shader "Cull/Front" {
    Properties
    {
       _MainTex("_MainTex",2D)="white"{}
    }
    SubShader
    {
        Pass
        {
        /*    Tags{"Queue"="Geometry+20"}*/
            ZTest Greater
            Offset 10000,0

            //Cull back
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"

            sampler2D _MainTex;
            float4 _MainTex_ST;

            struct v2f
            {
              float4 pos:POSITION;
              float2 uv:TEXCOORD0;
            };

            v2f vert(appdata_full v)
            {
               v2f o;
               o.pos=UnityObjectToClipPos(v.vertex);
               o.uv=TRANSFORM_TEX(v.texcoord,_MainTex);
               return o;
            }

            float4 frag(v2f v):Sv_Target
            {
              float4 texCol=tex2D(_MainTex,v.uv);
              return texCol;
            }

            ENDCG
        }
    }
    FallBack "Diffuse"
}

运行效果

       

最后补充一种用模型的方法，模型做好掏空的结构。

Shader "WFJ/DepthMask"
{
    SubShader
    {
        ColorMask 0
        Pass
        {
            ZWrite On
            Color (1,1,1,1)
        }  
    }
}