前言

暂时不太方便上截图，有时间会补上。效果是被遮挡的部分会以设定的颜色亮起，且边缘高亮.

shader

直接看shader怎么写的。

Shader "Exercise/TransparentShader-1" {
    Properties {
        _MainTex("Texture", 2D) = "white" {}
        _Color("Color", Color) = (1,1,1,1)
    }
    SubShader {
        Tags { "RenderType"="Opaque" "IgnoreProjector"="True" "Queue"="Geometry"}
        Pass {
             ZWrite Off
             Blend SrcAlpha One
             ZTest Greater
             CGPROGRAM
            
             #pragma vertex vert
             #pragma fragment frag
             fixed4 _Color;
             struct v2f {
                 float4 vertex : SV_POSITION;
                 float3 normal: normal;
                 float3 viewDir: TEXCOORD0;
              }
              
             v2f vert(appdata_base v) {
                  v2f o;
                  o.vertex = UnityObjectToClipPos(v.vertex);
                  o.normal = v.normal;
                  o.viewDir = ObjSpaceViewDir(v.vertex);
                  return o;
             }
             fixed4 frag(v2f i) : SV_Target {
                 fixed3 normal = normalize(i.normal);
                 fixed3 viewDir = normalize(i.viewDir);
                 float rim = 1 - dot(normal, viewDir);
                 return _Color * rim;
             }
             ENDCG
        }
        Pass {
            ZWrite On
            CGPROGRAM 
            #pragma vertex vert
            #pragma fragment frag
            sampler2D _MainTex;
            float4 _MainTex_ST;
            struct v2f {
                float4 vextex : POSITION;
                float2 uv: TEXCOORD0;
            }
            v2f vert(appdata_base v) {
                v2f o;
                o.vertex = v.vertex;
                o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
            }
            fixed4 frag(v2f i) : SV_Target {
                 return tex2D(_MainTex, i.uv);
            }
            ENDCG
        }
    }
    FallBack "Diffuse"
}