// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'

Shader "Custom/TransparentShadowCollector"
{
    Properties
    {
        _Color("Main Color", Color) = (1,1,1,.5)
        _ShadowIntensity("Shadow Intensity", Range(0, 1)) = 0.6
    }
        SubShader
    {
        Tags {"Queue" = "AlphaTest" }
        Pass
        {
            Tags {"LightMode" = "ForwardBase" }
            Cull Back
            Blend SrcAlpha OneMinusSrcAlpha
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #pragma multi_compile_fwdbase
            #include "UnityCG.cginc"
            #include "AutoLight.cginc"
            uniform fixed4  _Color;
            uniform float _ShadowIntensity;
            struct v2f
            {
                float4 pos : SV_POSITION;
                LIGHTING_COORDS(0,1)
            };
            v2f vert(appdata_base v)
            {
                v2f o;
                o.pos = UnityObjectToClipPos(v.vertex);
                TRANSFER_VERTEX_TO_FRAGMENT(o);

                return o;
            }
            fixed4 frag(v2f i) : COLOR
            {
                float attenuation = LIGHT_ATTENUATION(i);
                return fixed4(0,0,0,(1 - attenuation) * _ShadowIntensity) * _Color;
            }
            ENDCG
        }
    }
        Fallback "VertexLit"
}