Unity shader realizes mirror effect with rendered texture

Realization principle ：

• Set up an additional camera to capture the scene included in the mirror , And the captured image is rendered into the rendered texture and stored , For mirror rendering .
• Write for the mirror shader Using rendered textures .

Realization effect ：

scene ：

Mirror ：

Implementation code ：

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

Shader "Custom/Chapter10-Mirror"
{
    
    Properties
    {
    
    // The rendered texture rendered by the camera 
    _MainTex("Main Tex",2D)="white"{
    }
    }
    SubShader
    {
    
    Tags {
     "RenderType"="Opaque" "Queue"="Geometry"}
    Pass{
    

    CGPROGRAM

    
    #pragma vertex vert
    #pragma fragment frag

    sampler2D _MainTex;
    struct a2v{
    
    float4 vertex:POSITION;
    float3 texcoord:TEXCOORD0;
    };

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

    v2f vert(a2v i){
    
    v2f o;
    o.uv=i.texcoord;
    o.pos=UnityObjectToClipPos(i.vertex);
    o.uv.y=1-o.uv.y;
    return o;
    }
    fixed4 frag(v2f i):SV_Target{
    
    return tex2D(_MainTex,i.uv);
    }
    ENDCG
    }
    }
    FallBack Off
}