一、创建Shader

Shader "Custom/ShaderBlinnPhong" {
	Properties {
		_MainTex ("Base (RGB)", 2D) = "white" {}
		_MainTint ("Diffuse Tint", Color) = (1,1,1,1)
		_SpecColor ("Specular Color", Color) = (1,1,1,1)
		_SpecPower ("Specular Power", Range(0, 1)) = 0.5
	}
	SubShader {
		Tags { "RenderType"="Opaque" }
		LOD 200
		
		CGPROGRAM
		//内置的高光模型BlinnPhong(镜面反射光照模型)
		//放在Unity安装目录Data文件夹下的UnityCG.cginc文件里在。
		#pragma surface surf BlinnPhong

		sampler2D _MainTex;
		float4 _MainTint;
		//_SpecColor: 在内置的高光模型中Unity已经为我们声明了该变量。
		fixed _SpecPower;

		struct Input {
			float2 uv_MainTex;
		};

		void surf (Input IN, inout SurfaceOutput o) {
			half4 c = tex2D (_MainTex, IN.uv_MainTex) * _MainTint;
			o.Specular = _SpecPower;//高光强度
			o.Gloss = 1.0;//光泽度
			o.Albedo = c.rgb;
			o.Alpha = c.a;
		}
		ENDCG
	} 
	FallBack "Diffuse"
}

二、创建Plane和Sphere

运行效果

Specular Power值越小光点范围越大。