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

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

Shader "Unlit/NormalShader"
{
    Properties
    {
        _Cutoff ("Threshold", Range(0,1)) = 0.5
    }
    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;
                float3 normal : NORMAL;
            };

            struct v2f
            {
                float3 normalWorld : TEXCOORD1;
                UNITY_FOG_COORDS(1)
                float4 vertex : SV_POSITION;
            };

            float _Cutoff;

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.normalWorld = normalize( mul( float4( v.normal, 0.0 ), unity_WorldToObject ).xyz );
                UNITY_TRANSFER_FOG(o,o.vertex);
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                clip( dot(i.normalWorld, float3(0,1,0)) - _Cutoff );
                // apply fog bc why not
                UNITY_APPLY_FOG(i.fogCoord, col);
                return half4(0,1,0,1);
            }
            ENDCG
        }
    }
}