Surface Shader  Cubemap

using UnityEngine;
using UnityEditor;
using System.Collections;

public class RenderCubemapWizard : ScriptableWizard {

    public Transform renderFromPosition;
    public Cubemap cubemap;

    void OnWizardUpdate () {
        helpString = "Select transform to render from and cubemap to render into";
        isValid = (renderFromPosition != null) && (cubemap != null);
    }

    void OnWizardCreate () {
        // create temporary camera for rendering
        GameObject go = new GameObject( "CubemapCamera");
        go.AddComponent<Camera>();
        // place it on the object
        go.transform.position = renderFromPosition.position;
        go.transform.rotation = Quaternion.identity;
        // render into cubemap       
        go.GetComponent<Camera>().RenderToCubemap( cubemap );

        // destroy temporary camera
        DestroyImmediate( go );
    }

    [MenuItem("GameObject/Render into Cubemap")]
    static void RenderCubemap () {
        ScriptableWizard.DisplayWizard<RenderCubemapWizard>(
            "Render cubemap", "Render!");
    }
}

    Properties
    {
        _MainTint ("Diffuse Tint", Color) = (1,1,1,1)
        _MainTex ("Base (RGB)", 2D) = "white" {}
        _Cubemap ("CubeMap", CUBE) = ""{}
        _ReflAmount ("Reflection Amount", Range(0.01, 1)) = 0.5
    }

        sampler2D _MainTex;
        samplerCUBE _Cubemap;
        float4 _MainTint;
        float _ReflAmount;

        struct Input
        {
            float2 uv_MainTex;
            float3 worldRefl;
        };

void surf (Input IN, inout SurfaceOutput o)
{
    half4 c = tex2D (_MainTex, IN.uv_MainTex) * _MainTint;
    o.Emission = texCUBE(_Cubemap, IN.worldRefl).rgb * _ReflAmount;
    o.Albedo = c.rgb;
    o.Alpha = c.a;
}

Shader "Custom/SimpleReflection"
{
    Properties
    {
        _MainTint ("Diffuse Tint", Color) = (1,1,1,1)
        _MainTex ("Base (RGB)", 2D) = "white" {}
        _Cubemap ("CubeMap", CUBE) = ""{}
        _ReflAmount ("Reflection Amount", Range(0.01, 1)) = 0.5
    }
    
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 200
        
        CGPROGRAM
        #pragma surface surf Lambert

        sampler2D _MainTex;
        samplerCUBE _Cubemap;
        float4 _MainTint;
        float _ReflAmount;

        struct Input
        {
            float2 uv_MainTex;
            float3 worldRefl;
        };

        void surf (Input IN, inout SurfaceOutput o)
        {
            half4 c = tex2D (_MainTex, IN.uv_MainTex) * _MainTint;
            o.Emission = texCUBE(_Cubemap, IN.worldRefl).rgb * _ReflAmount;
            o.Albedo = c.rgb;
            o.Alpha = c.a;
        }
        ENDCG
    }
    FallBack "Diffuse"
}