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Shader "Sbin/SurfaceShader" {

	Properties {

		_Glossiness ("Smoothness", Range(0,1)) = 0.5

		_Metallic ("Metallic", Range(0,1)) = 0.0

		_UpColor("UpColor",color) = (1,0,0,1)

		_DownColor("DownColor",color) = (0,1,0,1)

		_Center("Center",range(-0.7,0.7)) = 0

		_R("R",range(0,0.5)) = 0.2

	}

	SubShader {

		Tags { "RenderType"="Opaque" }

		LOD 200

		CGPROGRAM

		#pragma surface surf Standard vertex:vert fullforwardshadows

		//说明：pragma surface method1 Standard vertex:method2	fullforwardshadows

		#pragma target 3.0

		sampler2D _MainTex;

		struct Input {

			float2 uv_MainTex;

			float x:TEXCOORD0;

		};

		half _Glossiness;

		half _Metallic;

		float4 _UpColor;

		float4 _DownColor;

		float _Center;

		float _R; 

		void vert(inout appdata_full v,out Input o){

			o.uv_MainTex = v.texcoord.xy;

			o.x = v.vertex.x;

		}

		void surf (Input IN, inout SurfaceOutputStandard o) {

			fixed4 c = tex2D (_MainTex, IN.uv_MainTex);

			o.Albedo = c.rgb;

			o.Metallic = _Metallic;

			o.Smoothness = _Glossiness;

			o.Alpha = c.a;

			float d = IN.x - _Center;//融合带

			float s = abs(d);

			d = d/s;//正负值分别描写叙述上半部分和下半部分。取值1和-1

			float f = s/_R;	//范围>1：表示上下部分;范围<1:表示融合带

			f = saturate(f);

			d *= f;//表示所有[-1,1];范围>1：表示上部分；范围<1:表示融合带;范围<-1:表示下部分

			d = d/2+0.5;//将范围控制到[0,1],由于颜色值返回就是[0,1]

			o.Albedo += lerp(_UpColor,_DownColor,d);

		}

		ENDCG

	}

	FallBack "Diffuse"

}

效果：