Ramp Cutoff Transparent

Shader "Cutoff/Ramp Cutoff Transparent" {

    Properties {
        _MainTex ("Main Texture", 2D) = "white" {}
        [HDR] _Color ("Main Color", Color) = (0, 0, 0, 1)
        [HDR] _DarkEmissiveColor ("Dark Color", Color) = (0, 0, 0, 1)
        [HDR] _LightEmissiveColor ("Light Color", Color) = (1, 1, 1, 1)
        _Cutoff ("Cutoff", Range (0, 1)) = 0.5
         _Transparency("Transparency", Range(0.0,1.0)) = 0
    }

    SubShader {
        Tags {"Queue"="Transparent" "RenderType"="Transparent"}
        CGPROGRAM
        #pragma surface surf Lambert alpha

        struct Input {
            float2 uv_MainTex;
            float3 viewDir;
        };

        sampler2D _MainTex;
        sampler2D _BumpMap;
        float4 _Color;
        float4 _Transparency;
        float4 _DarkEmissiveColor;
        float4 _LightEmissiveColor;
        float _Cutoff;

        void surf (Input IN, inout SurfaceOutput o) {
            o.Albedo = _Color;
            float rampValue = tex2D (_MainTex, IN.uv_MainTex).r;
            float cutoff = step(_Cutoff, rampValue);
            o.Emission = lerp(_DarkEmissiveColor, _LightEmissiveColor, cutoff);
            o.Alpha = lerp(_DarkEmissiveColor.a, _LightEmissiveColor.a, cutoff);
        }

        ENDCG
    }

    Fallback "Diffuse"

}