Update

Assets/Third Parties/Opsive/UltimateCharacterController/Demo/Shaders/TerrainSurface.shader

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+Shader "Ultimate Character Controller/Demo/TerrainSurface"
+{
+	Properties
+	{
+		_Mask ("Mask", 2D) = "black" {}
+	
+		_MainTex ("Albedo 0", 2D) = "white" {}
+		_MainTex2 ("Albedo 1", 2D) = "white" {}
+	
+		_NormalMap ("NormalMap 0", 2D) = "bump" {}
+		_NormalMap2 ("NormalMap 1", 2D) = "bump" {}
+		
+		[LM_Specular] [LM_Glossiness] _SpecGlossMap("Specular 0", 2D) = "white" {}
+		[LM_Specular] [LM_Glossiness] _SpecGlossMap2("Specular 1", 2D) = "white" {}
+	}
+
+	// SM3+
+	SubShader
+	{
+		Tags { "RenderType" = "Opaque" }
+		CGPROGRAM
+		#pragma surface surf StandardSpecular fullforwardshadows addshadow
+		// until texCubeLOD is solved
+		#pragma exclude_renderers gles
+		#pragma target 3.0
+
+				
+		struct Input
+		{
+			float4 color;
+			float2 uv_MainTex;
+			float2 uv_MainTex2;
+			float2 uv_Mask;
+		};
+	
+		sampler2D _MainTex;
+		sampler2D _MainTex2;
+	
+		sampler2D _NormalMap;
+		sampler2D _NormalMap2;
+	
+		sampler2D _SpecGlossMap;
+		sampler2D _SpecGlossMap2;
+	
+		sampler2D _Mask;
+	
+		void surf (Input IN, inout SurfaceOutputStandardSpecular o)
+		{
+			fixed blend = tex2D(_Mask, IN.uv_Mask).a;
+	
+			fixed4 albedo1 = tex2D(_MainTex, IN.uv_MainTex);
+			fixed4 spec1	= tex2D(_SpecGlossMap, IN.uv_MainTex);
+		 	fixed3 normal1 = UnpackNormal (tex2D (_NormalMap, IN.uv_MainTex));
+
+			fixed4 albedo2 = tex2D(_MainTex2, IN.uv_MainTex2);
+			fixed4 spec2 = tex2D(_SpecGlossMap2, IN.uv_MainTex2);
+		 	fixed3 normal2 = UnpackNormal (tex2D (_NormalMap2, IN.uv_MainTex2));
+
+		 	fixed4 specGloss = lerp (spec1, spec2, blend);
+			
+			o.Albedo 		= lerp (albedo1, albedo2, blend);
+		 	o.Specular 		= specGloss.rgb;
+			o.Smoothness 	= specGloss.a;
+		  	o.Normal 		= lerp (normal1, normal2, blend);
+		}
+		ENDCG
+	}
+}