15-2-노멀맵에 반사처리

Shader "Custom/15-2-NormalMap"
{
    Properties
    {
		_MainTex("Texture", 2D) = "white" {}
		_BumpMap("NormalMap (RGB)", 2D) = "white" {}	
		_Cube("Cubemap", CUBE) = "" {}
    }
    SubShader
    {
		Tags { "RenderType" = "Opaque" }

		CGPROGRAM
		#pragma surface surf Lambert noambient

		struct Input
		{
			float2 uv_MainTex;
			float2 uv_BumpMap;
			float3 worldRefl;
			// 노멀맵에 반사처리르 할때
			INTERNAL_DATA
		};

		sampler2D _MainTex;
		sampler2D _BumpMap;
		samplerCUBE _Cube;

		void surf(Input IN, inout SurfaceOutput o)
		{
			o.Normal = UnpackNormal(tex2D(_BumpMap, IN.uv_BumpMap));
			fixed4 c = tex2D(_MainTex, IN.uv_MainTex);
			// 노멀맵에 반사처리르 할때
			float4 re = texCUBE(_Cube, WorldReflectionVector(IN, o.Normal));
			// float4 re = texCUBE(_Cube, IN.worldRefl);
			o.Albedo = c.rgb;
			o.Emission = re.rgb;
			o.Alpha = c.a;
		}
		ENDCG
    }
    FallBack "Diffuse"
}