Unity3d《Shader篇》法线贴图

效果图

 

贴图

 

法线贴图

 

//代码

Shader "Custom/NormalMap" {

	Properties

	{

		_MainTex ("Texture", 2D) = "white" {}

		_NormalMap ("NormalMap", 2D) = "bump" {}

		_Color ("Main Color", Color) = (1,1,1,1)

		_SpecColor("Specular Color", Color) = (0.5,0.5,0.5,1)

		_Shininess("Shininess", Range(0.01,1)) = 0.1

	}

	

 	

	SubShader

	{

		Tags { "RenderType"="Opaque" }

		LOD 300

		

		

			CGPROGRAM



			

			#pragma surface surf PPL

			

			sampler2D _MainTex;

			sampler2D _NormalMap;

			float4 _Color;

			//float4 _SpecColor;

			float _Shininess;

			

			struct Input

			{

				float2 uv_MainTex;

			};

			

			// Forward lighting

		half4 LightingPPL (SurfaceOutput s, half3 lightDir, half3 viewDir, half atten)

		{

			half3 nNormal = normalize(s.Normal);

			half shininess = s.Gloss * 250.0 + 4.0;



		#ifndef USING_DIRECTIONAL_LIGHT

			lightDir = normalize(lightDir);

		#endif



			// Phong shading model

			//half reflectiveFactor = max(0.0, dot(-viewDir, reflect(lightDir, nNormal)));



			// Blinn-Phong shading model

			half reflectiveFactor = max(0.0, dot(nNormal, normalize(lightDir + viewDir)));



			half diffuseFactor = max(0.0, dot(nNormal, lightDir));

			half specularFactor = pow(reflectiveFactor, shininess) * s.Specular;



			half4 c;

			c.rgb = (s.Albedo * diffuseFactor + _SpecColor.rgb * specularFactor) * _LightColor0.rgb;

			c.rgb *= (atten * 2.0);

			c.a = s.Alpha;

			return c;

		}

		

			void surf(Input IN, inout SurfaceOutput o)

			{

				half4 tex 	= tex2D(_MainTex, IN.uv_MainTex) * _Color;

				o.Albedo 	= tex.rgb;

				o.Alpha 	= _Color.a;

				o.Normal	= UnpackNormal(tex2D(_NormalMap, IN.uv_MainTex));

				o.Specular 	= tex.a;

				o.Gloss 	= _Shininess;

			}

			

			ENDCG

		

	}

	

	Fallback "Diffuse"

}