Shader-高光反射（頂點實現）；控制高光範圍；控制高光顏色

• Blinn光照模型     
• cosθ= dot(reflectDir, viewDir)
• 直射光 Specular = 直射光 * pow( max(cosθ,0),10)  θ:是反射光方向和視野方向的夾角    10可以控制高光的範圍參數越小範圍越大

  // Upgrade NOTE: replaced '_World2Object' with 'unity_WorldToObject'
  
  // Upgrade NOTE: replaced '_World2Object' with 'unity_WorldToObject'
  
  Shader "LXC/07 Specular Vertex"
  {
  	Properties{
  		_Diffuse("Diffuse Color",Color) = (1,1,1,1)
  	}
  		SubShader
  	{
  		Pass{
  		Tags{ "LightMode" = "ForwardBase" }
  		CGPROGRAM
  #include "Lighting.cginc"
  #pragma vertex vert		
  #pragma fragment frag
  		fixed4 _Diffuse;
  
  	struct a2v {
  		float4 vertex:POSITION;
  		float3 normal:NORMAL;
  	};
  
  	struct v2f {
  		float4 position:SV_POSITION;
  		fixed3 color : COLOR0;
  	};
  
  	v2f vert(a2v v) {
  		v2f f;
  		f.position = UnityObjectToClipPos(v.vertex);
  		fixed3 ambient = UNITY_LIGHTMODEL_AMBIENT.rgb;
  		fixed3 normalDir = normalize(mul(v.normal, (float3x3)unity_WorldToObject));
  		fixed3 lightDir = normalize(_WorldSpaceLightPos0.xyz);
  		fixed3 diffuse = _LightColor0.rgb * max(dot(normalDir, lightDir), 0)*_Diffuse.rgb;
  		//高光反射
  		//反射光的方向
  		fixed3 reflectDir = normalize(reflect(-lightDir, normalDir));			//reflect計算反射光
  		//視野方向
  		fixed3 viewDir = normalize(_WorldSpaceCameraPos.xyz - mul(v.vertex, unity_WorldToObject).xyz);	//_WorldSpaceCameraPos相機位置,vertex當前點的位置
  		fixed3 specular = _LightColor0.rgb * pow(max(dot(reflectDir, viewDir), 0), 5);
  		f.color = diffuse + ambient + specular;
  		return f;
  	}
  
  
  	fixed4 frag(v2f f) :SV_Target{		
  		return fixed4(f.color,1);
  	}
  		ENDCG
  	}
  	}
  		Fallback "Diffuse"
  }

   

• 擴展控制高光範圍

  // Upgrade NOTE: replaced '_World2Object' with 'unity_WorldToObject'
  
  // Upgrade NOTE: replaced '_World2Object' with 'unity_WorldToObject'
  
  Shader "LXC/07 Specular Vertex"
  {
  	Properties{
  		_Diffuse("Diffuse Color",Color) = (1,1,1,1)
  		_Gloss("Gloss",Range(8,200)) = 10
  	}
  		SubShader
  	{
  		Pass{
  		Tags{ "LightMode" = "ForwardBase" }
  		CGPROGRAM
  #include "Lighting.cginc"
  #pragma vertex vert		
  #pragma fragment frag
  		fixed4 _Diffuse;
  		half _Gloss;
  
  	struct a2v {
  		float4 vertex:POSITION;
  		float3 normal:NORMAL;
  	};
  
  	struct v2f {
  		float4 position:SV_POSITION;
  		fixed3 color : COLOR0;
  	};
  
  	v2f vert(a2v v) {
  		v2f f;
  		f.position = UnityObjectToClipPos(v.vertex);
  		fixed3 ambient = UNITY_LIGHTMODEL_AMBIENT.rgb;
  		fixed3 normalDir = normalize(mul(v.normal, (float3x3)unity_WorldToObject));
  		fixed3 lightDir = normalize(_WorldSpaceLightPos0.xyz);
  		fixed3 diffuse = _LightColor0.rgb * max(dot(normalDir, lightDir), 0)*_Diffuse.rgb;
  		//高光反射
  		//反射光的方向
  		fixed3 reflectDir = normalize(reflect(-lightDir, normalDir));			//reflect計算反射光
  		//視野方向
  		fixed3 viewDir = normalize(_WorldSpaceCameraPos.xyz - mul(v.vertex, unity_WorldToObject).xyz);	//_WorldSpaceCameraPos相機位置,vertex當前點的位置
  		fixed3 specular = _LightColor0.rgb * pow(max(dot(reflectDir, viewDir), 0), _Gloss);
  		f.color = diffuse + ambient + specular;
  		return f;
  	}
  
  
  	fixed4 frag(v2f f) :SV_Target{		
  		return fixed4(f.color,1);
  	}
  		ENDCG
  	}
  	}
  		Fallback "Diffuse"
  }

   

• 控制高光顏色

  // Upgrade NOTE: replaced '_World2Object' with 'unity_WorldToObject'
  
  // Upgrade NOTE: replaced '_World2Object' with 'unity_WorldToObject'
  
  Shader "LXC/07 Specular Vertex"
  {
  	Properties{
  		_Diffuse("Diffuse Color",Color) = (1,1,1,1)
  		_Gloss("Gloss",Range(8,200)) = 10
  		//控制高光顏色
  		_Specular("Specular Color",Color)=(1,1,1,1)
  	}
  		SubShader
  	{
  		Pass{
  		Tags{ "LightMode" = "ForwardBase" }
  		CGPROGRAM
  #include "Lighting.cginc"
  #pragma vertex vert		
  #pragma fragment frag
  		fixed4 _Diffuse;
  		half _Gloss;
  		fixed4 _Specular;
  
  	struct a2v {
  		float4 vertex:POSITION;
  		float3 normal:NORMAL;
  	};
  
  	struct v2f {
  		float4 position:SV_POSITION;
  		fixed3 color : COLOR0;
  	};
  
  	v2f vert(a2v v) {
  		v2f f;
  		f.position = UnityObjectToClipPos(v.vertex);
  		fixed3 ambient = UNITY_LIGHTMODEL_AMBIENT.rgb;
  		fixed3 normalDir = normalize(mul(v.normal, (float3x3)unity_WorldToObject));
  		fixed3 lightDir = normalize(_WorldSpaceLightPos0.xyz);
  		fixed3 diffuse = _LightColor0.rgb * max(dot(normalDir, lightDir), 0)*_Diffuse.rgb;
  		//高光反射
  		//反射光的方向
  		fixed3 reflectDir = normalize(reflect(-lightDir, normalDir));			//reflect計算反射光
  		//視野方向
  		fixed3 viewDir = normalize(_WorldSpaceCameraPos.xyz - mul(v.vertex, unity_WorldToObject).xyz);	//_WorldSpaceCameraPos相機位置,vertex當前點的位置
  		fixed3 specular = _LightColor0.rgb * pow(max(dot(reflectDir, viewDir), 0), _Gloss) * _Specular.rgb;
  		f.color = diffuse + ambient + specular;
  		return f;
  	}
  
  
  	fixed4 frag(v2f f) :SV_Target{		
  		return fixed4(f.color,1);
  	}
  		ENDCG
  	}
  	}
  		Fallback "Diffuse"
  }