Demo 28 - Glass with skybox

Shader "Custom/BasicGlass" {
    Properties {
        _MainTex ("Glass Main Texure", 2D) = "white" {}
        _Transparency ("Transparency Main Texture", Range(0, 1)) = 1
        _EmissionColor ("Emission color", Color) = (1, 1, 1, 1)
        _CubeMap ("CubeMap", Cube) = "white" {}

    }
    SubShader {
        Tags { "Queue"="Transparent" "RenderType"="Transparent" }

        CGPROGRAM
        #pragma surface surf BlinnPhong alpha

        struct Input {
            float2 uv_MainTex;
            float3 worldRefl;
        };

        sampler2D _MainTex;
        samplerCUBE _CubeMap;
        fixed4 _EmissionColor;
        fixed _Transparency;


        void surf (Input IN, inout SurfaceOutput o) {
            half4 c = tex2D (_MainTex, IN.uv_MainTex);
            fixed4 w = texCUBE(_CubeMap, IN.worldRefl);
            o.Emission = _EmissionColor.rgb * w.rgb;

            o.Specular = 0;
            o.Gloss = 1;
            o.Albedo = 0;
            o.Alpha = c.a * _EmissionColor.a * _Transparency;
        }
        ENDCG
    }
    FallBack "Transparent/VertexLit"
}