// Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'
// Upgrade NOTE: replaced '_World2Object' with 'unity_WorldToObject'

Shader "Unlit/shadow2"
{  
    Properties  
    {  
        _MainTex("Base (RGB)", 2D) = "white" {}
        _ShadowCol("Color", color) = (0,0,0,1)  
        _ShadowAlpha("ShadowAlpha", Float) = 0.5
        _StencilID("StencilID", Int) = 0  
        _Plane("Plane", vector) = (0,1,-0.6,0)  
        _LightDir("LightDir", vector) = (1,-1,-0.1,0)  
    }  
    SubShader  
    {  
        Tags{ "RenderType" = "Transparent" "Queue" = "Transparent" }  
        Pass  
        {  
            Name "Shadowpass"
            Stencil{  
                Ref [_StencilID]  
                Comp NotEqual  
                Pass replace  
            }  
            zwrite off  
            blend srcalpha oneminussrcalpha  
            offset -1,-1  
            CGPROGRAM  
            #pragma vertex vert  
            #pragma fragment frag  
            #pragma multi_compile_fog  
               
            #include "UnityCG.cginc"  
   
            struct appdata  
            {  
                float4 vertex : POSITION;  
            };  
   
            struct v2f  
            {  
              //  UNITY_FOG_COORDS(0)  
                float4 vertex : SV_POSITION;  
                fixed4 col : COLOR;  
                //float2 uv : TEXCOORD0;
            };  
             sampler2D _MainTex;
            fixed4 _ShadowCol;  
            fixed _ShadowAlpha;  
            float4 _Plane;  
            float4 _LightDir;  
               
            v2f vert (appdata v)  
            {  
                v2f o;  
                float4 worldPos = mul(unity_ObjectToWorld, v.vertex);  
                half t = (_Plane.w - dot(worldPos.xyz, _Plane.xyz)) / dot(_LightDir.xyz, _Plane.xyz);  
                worldPos.xyz = worldPos.xyz + t*_LightDir.xyz;  
                o.vertex = mul(unity_MatrixVP, worldPos);  
                _ShadowCol.a = _ShadowAlpha;
                o.col = _ShadowCol *step(0, t);  
                //UNITY_TRANSFER_FOG(o,o.vertex);  
               // o.uv = v.texcoord;
                return o;  
            }  
               
            fixed4 frag (v2f i) : SV_Target  
            {  
                //fixed4 col = tex2D(_MainTex, i.uv);
                //fixed4 col2 = i.col;  
                //col2.a = col2.a*col.a;  
               // UNITY_APPLY_FOG(i.fogCoord, col2);  
                return i.col;  
                //return col2;  
            }  
            ENDCG  
        }  
    }  
}