unity 看到Sphere内部，通过Sphere播放全景视频时候遇到的问题

 1 Shader "Unlit/UnlitShader"
 2 {
 3     Properties
 4     {
 5         _MainTex ("Texture", 2D) = "white" {}
 6     }
 7     SubShader
 8     {
 9         Tags { "RenderType"="Opaque" }
10         LOD 100
11         Cull Front //剔除正面,用于看到球体的内
12         
13         Pass
14         {
15             CGPROGRAM
16             #pragma vertex vert
17             #pragma fragment frag
18             #pragma multi_compile_fog
19             
20             #include "UnityCG.cginc"
21 
22             struct appdata
23             {
24                 float4 vertex : POSITION;
25                 float2 uv : TEXCOORD0;
26             };
27 
28             struct v2f
29             {
30                 float2 uv : TEXCOORD0;
31                 UNITY_FOG_COORDS(1)
32                 float4 vertex : SV_POSITION;
33             };
34 
35             sampler2D _MainTex;
36             float4 _MainTex_ST;
37             
38             v2f vert (appdata v)
39             {
40                 v2f o;
41                 o.vertex = UnityObjectToClipPos(v.vertex);
42                 o.uv = TRANSFORM_TEX(v.uv, _MainTex);
43                 UNITY_TRANSFER_FOG(o,o.vertex);
44                 return o;
45             }
46             
47             fixed4 frag (v2f i) : SV_Target
48             {
49 
50                 float u_x=1-i.uv.x;    //因为球的内部是像镜子一样反着的
51                 float u_y=i.uv.y;      //所以要改变其uv坐标
52                 i.uv=float2(u_x,u_y);  //只改变x，就行了，
53 
54 
55                 fixed4 col = tex2D(_MainTex, i.uv);
56                 UNITY_APPLY_FOG(i.fogCoord, col);
57                 return col;
58             }
59             ENDCG
60         }
61     }
62 }