Unity调试shader

Shader "Unlit/NewVerticesUnlitShader"
｛
    Properties
    ｛
        _MainTex ("Texture", 2D) = "white" ｛｝
        _TopColor("Top Color",Color)=(1,1,1,1)
        _CenterColor("Center Color",Color)=(1,1,1,1)
        _BottomColor("Bottom Color",Color)=(1,1,1,1)
    ｝
    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;
                UNITY_FOG_COORDS(1)
                float4 vertex : SV_POSITION;
                fixed4 color : COLOR;
            ｝;
            sampler2D _MainTex;
            float4 _MainTex_ST;
            fixed4 _TopColor;
            fixed4 _CenterColor;
            fixed4 _BottomColor;
            v2f vert (appdata v)
            ｛
                v2f o;
                float3 dir = normalize(v.vertex);
                float lp;
                if (dir.y>0)
                ｛
                    lp = (1 - dir.y) /1;
                    o.color = lerp(_TopColor, _CenterColor, lp);
                ｝
                else
                ｛
                    lp =(1+ dir.y) / 1;
                    o.color = lerp(_CenterColor, _BottomColor, lp);
                ｝
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                UNITY_TRANSFER_FOG(o,o.vertex);
                return o;
            ｝
            fixed4 frag (v2f i) : SV_Target
            ｛
                //// sample the texture
                //fixed4 col = tex2D(_MainTex, i.uv);
                //// apply fog
                //UNITY_APPLY_FOG(i.fogCoord, col);
                //return col;
                return i.color;
            ｝
            ENDCG
        ｝
    ｝
｝