Unity custom sky ball model to prevent it from being cropped

stay unity in , Sometimes I don't want to use the built-in sky ball to render , that , We will use a sphere to render the sky ball . In order to ensure that the game scene models are placed in the sky ball . The sphere will enlarge greatly , So here's the problem , This will cause the sphere to be out of the camera's visual range , The sky ball cannot be rendered , Adjust the cut far side of the camera , Will affect performance , It also affects the rendering effect .
Here's a solution , That is, we can modify the cutting coordinates of the vertex shader output of the sphere in the material , Limit its value to -1 To 1 Within the scope of , To solve the problem that cannot be rendered .

This is a base unlit Modified sky ball to prevent being cropped shader

Shader "Unlit/SkyBox"
{
    
    Properties
    {
    
        _MainTex ("Texture", 2D) = "white" {
     }
    }
    SubShader
    {
    
        Tags {
     "RenderType" = "Opaque" }
        LOD 100

        Pass
        {
    
            CGPROGRAM

            #pragma vertex vert
            #pragma fragment frag
            // make fog work
            #pragma multi_compile_fog

            #include "UnityCG.cginc"

            struct appdata
            {
    
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

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

            sampler2D _MainTex;
            float4 _MainTex_ST;

            v2f vert(appdata v)
            {
    
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                // The output position will be z Coordinates are limited to -1 To 1 Within the scope of , This can prevent the customized sky ball from being cut out 
                #if UNITY_REVERSED_Z // This macro is used to judge the platform , The farthest clipping value of a platform is 1, There are plenty of them -1
                    o.vertex.z = o.vertex.w * 0.000001f;
                #else
                    o.vertex.z = o.vertex.w * 0.999999f;
                #endif
                return o;
            }

            half4 frag(v2f i) : SV_Target
            {
    
                // sample the texture
                half4 col = tex2D(_MainTex, i.uv);
                return col;
            }
            ENDCG

        }
    }
}