之前一直觉得传送门挺高大上的,今日抽空看看案例才发现,其实原理只是模型上加了遮罩
学习链接 : https://www.bilibili.com/video/av34740402

一.模型准备工作

在上面的学习链接有工程,我用的是他们的模型,仔细分析了下,主要关键的是两个MaskShader
①.MainShader : 模型材质应选择的shader

Shader "MASK/MainShader"
{
    Properties
    {
        _MainTex("Texture", 2D) = "white" {}
    _Color("Main Color", Color) = (1,1,1,1)
        _BumpMap("Normalmap", 2D) = "bump" {}
    _Glossiness("Smoothness", Range(0,1)) = 0.5
        _Metallic("Metallic", Range(0,1)) = 0.0
    }
        SubShader
    {
        Tags{ "RenderType" = "Opaque"  "Queue" = "Geometry-2" }
        LOD 200

        Stencil
    {
        Ref 1
        Comp equal
        Pass keep
    }

        CGPROGRAM
#pragma surface surf Standard

        sampler2D _MainTex;
    sampler2D _BumpMap;

    struct Input
    {
        float2 uv_MainTex;
        float2 uv_BumpMap;
    };

    half _Glossiness;
    half _Metallic;
    fixed4 _Color;

    void surf(Input IN, inout SurfaceOutputStandard o)
    {
        fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
        o.Albedo = c.rgb;
        o.Normal = UnpackNormal(tex2D(_BumpMap, IN.uv_BumpMap));
        o.Metallic = _Metallic;
        o.Smoothness = _Glossiness;
    }
    ENDCG
    }

        FallBack "Diffuse"
}

②.MaskShader : 遮罩shader

Shader "MASK/MaskShader"
{
    SubShader
    {
        Tags{ "RenderType" = "Opaque" "Queue" = "Geometry-3" }

        ColorMask 0
        ZWrite on

        CGINCLUDE
#include "UnityCG.cginc"

        struct appdata
    {
        float4 vertex : POSITION;
    };

    struct v2f
    {
        float4 pos : SV_POSITION;
    };

    v2f vert(appdata v)
    {
        v2f o;
        o.pos = UnityObjectToClipPos(v.vertex);
        return o;
    }

    half4 frag(v2f i) : SV_Target
    {
        return half4(0,0,0,0);
    }
        ENDCG

        Pass
    {
        Stencil
        {
            Ref 1
            Comp always
            Pass replace
        }

            Cull Front

            CGPROGRAM
#pragma vertex vert
#pragma fragment frag
            ENDCG
    }
    }
}

例如案例中的模型身上 :

边上墙要增加遮罩 :

但是我没太明白为什么要加上Cude一个大遮罩,如果知道的朋友请赐教,感谢

二.按照平面识别教程做好后替换点击放置的模型即可