UnityShader——Phong光照模型 = Diffuse + Specular + Ambient
light(1, 1, 1) * stuff(0.2f, 0.3f, 0.5f) = (0.2f, 0.3f, 0.5f) 1 二.经验模型Phong
Phong = Ambient + Diffuse +Specular
1.Diffuse漫反射
Shader "Unlit/Lambert" {SubShader{Tags { "RenderType" = "Opaque" }LOD 100Pass{CGPROGRAM#pragma vertex vert#pragma fragment frag#include "UnityCG.cginc"#include "Lighting.cginc"struct appdata{float4 vertex : POSITION;float3 normal : NORMAL;};struct v2f{float3 worldNormal:TEXCOORD0;float4 vertex : SV_POSITION;};v2f vert (appdata v){v2f o;o.vertex = UnityObjectToClipPos(v.vertex);o.worldNormal = mul(v.normal, (float3x3)unity_WorldToObject);return o;}fixed4 frag (v2f i) : SV_Target{//法线Nfixed3 worldNormal = normalize(i.worldNormal);//光源方向LightDirfixed3 worldLightDir = normalize(_WorldSpaceLightPos0.xyz);//diffuse分量计算fixed3 diffuse = max(0.0, dot(worldNormal, -worldLightDir));//叠加光源色fixed3 diffuseColor = diffuse * _LightColor0.xyz;return fixed4(diffuseColor, 0);}ENDCG}} }
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加入Specular之后的Shader：
Shader "Unlit/Phong" {Properties{_SpecularGlass("SpecularGlassStrength", Range(0,64))=32}SubShader{Tags { "RenderType" = "Opaque" }LOD 100Pass{CGPROGRAM#pragma vertex vert#pragma fragment frag#include "UnityCG.cginc"#include "Lighting.cginc"struct appdata{float4 vertex : POSITION;float3 normal : NORMAL;};struct v2f{float3 worldNormal:NORMAL;float4 vertex : SV_POSITION;float3 worldPos : TEXCOORD1;};v2f vert (appdata v){v2f o;o.vertex = UnityObjectToClipPos(v.vertex);o.worldNormal = mul(v.normal, (float3x3)unity_WorldToObject);o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;return o;}float _SpecularGlass;fixed4 frag (v2f i) : SV_Target{fixed3 worldNormal = normalize(i.worldNormal);fixed3 worldLightDir = normalize(_WorldSpaceLightPos0.xyz);fixed3 diffuse = max(0.0, dot(worldNormal, -worldLightDir));fixed3 diffuseColor = diffuse * _LightColor0.xyz;//计算reflect方向fixed3 reflectDir = normalize(reflect(worldLightDir, worldNormal));//计算view方向fixed3 viewDir = normalize(_WorldSpaceCameraPos.xyz - i.worldPos);//specular分量fixed3 specular = pow(max(0.0, dot(reflectDir, viewDir)), _SpecularGlass);fixed3 specularColor = specular * _LightColor0.xyz;return fixed4(diffuseColor + specularColor, 0);}ENDCG}} }
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869 3.Ambient环境光环境光之间获取 乘上叠加物体颜色；
//环境光fixed3 ambient = UNITY_LIGHTMODEL_AMBIENT.xyz * _ObjColor; 12
给一个Obj颜色之后：
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