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Shader "Unlit/GUANGGAO"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        [MaterialToggle]_Verical("Verical",Range(0,1))=1//方向约束
 
    }
    SubShader
    {
        Tags { "RenderType"="Transparent" "Queuue"="Transparent" "IgnoreProjector"="true" "DisableBacthing"="True"} 
        LOD 100
 
        Pass
        {   
            ZWrite off
            Blend SrcAlpha OneMinusSrcAlpha
            Cull off
            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;
            };
 
            sampler2D _MainTex;
            float4 _MainTex_ST;
            fixed _Verical;
            v2f vert (appdata v)
            {
                v2f o;
                float3 center=float3 (0,0,0);
                float3 view=mul(unity_WorldToObject,float4(_WorldSpaceCameraPos,1));
                float3 normalDir=view - center;
                normalDir.y= normalDir.y*_Verical;
                normalDir=normalize(normalDir);
                float3 upDir= abs(normalDir.y)>0.999? float3(0,0,1):float3(0,1,0);//判断法线是否向上
                float3 rightDir=normalize(cross(upDir,normalDir));
                upDir=normalize(cross(normalDir,rightDir));
               float3 centerOffs=v.vertex.xyz-center;
               float3 localPos=center+rightDir*centerOffs.x+upDir*centerOffs.y+normalDir*centerOffs.z;
 
                o.vertex = UnityObjectToClipPos(localPos);
                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;
            }
            ENDCG
        }
    }