注意点：
1.法线的归一化 normalize (如果shader光照效果怪怪的，请查看是否归一化)
2.在计算自发光emission 直接使用的normal : appdata 中的normal 转到世界空间中的normal。emission跟光照没有关系，不受光照的影响(不是所有的地方都有自发光：添加emissionMask)
3.在计算直接光照效果 diffuse 和specular的时候， 用切线空间转换到世界空间中的法线
4.AO贴图： 只作用在 间接光照中 ： Indirectlight中的 diffuse 和specular
用AO来限制他们的亮度
5.用一张图的 rgba四个通道来存储相应的遮罩等值
下面是实现代码：
Shader "FishMan/12_AOE"{Properties{_MainTex ("Texture", 2D) = "white" {}_BumpMap ("Normal Map", 2D) = "bump"{}_Metallic_AO_MASK_Smoothness("_Metallic_AO_MASK_Smoothness", 2D) = "white" {}[HDR]_FresnelColor("FresnelColor", Color) = (0,0,0,0)_FresnelPower("FresnelPower", Range( 0 , 30)) = 0.8_FresnelScale("FresnelScale", Range( 0 , 1)) = 1}SubShader{Pass{Tags {"RenderType"="Opaque" "LightMode" = "ForwardBase"}CGPROGRAM#pragma vertex vert#pragma fragment frag#pragma target 3.0 #define _FORWADR_BASE#pragma multi_compile_fwdbase#pragma multi_compile_fog#include "../ExampleLibs/12_AOEimission.cginc" ENDCG }Pass{Tags {"RenderType"="Opaque" "LightMode" = "ForwardAdd" }Blend One OneZWrite OffCGPROGRAM#pragma vertex vert#pragma fragment frag#pragma multi_compile_fwdadd#pragma multi_compile_fog#pragma target 3.0 #include "../ExampleLibs/12_AOEimission.cginc" ENDCG}Pass{Tags {"LightMode"="ShadowCaster"}CGPROGRAM#pragma vertex vertShadowCaster#pragma fragment fragShadowCaster#pragma multi_compile_shadowcaster#include "../../ShaderLibs/Shadow.cginc" ENDCG}}}
#ifndef FMST02_AO_EIMISSION#define FMST02_AO_EIMISSION#include "UnityCG.cginc"#include "UnityPBSLighting.cginc" // PBS#include "AutoLight.cginc"struct appdata{float4 vertex : POSITION;float2 uv : TEXCOORD0;float3 normal : NORMAL;float4 tangent : TANGENT;};struct v2f{float4 pos : SV_POSITION;float2 uv : TEXCOORD0;float3 normal : TEXCOORD1;float3 worldPos: TEXCOORD2;#if defined(VERTEXLIGHT_ON)float3 vertexLightColor : TEXCOORD3;#endifSHADOW_COORDS(4) UNITY_FOG_COORDS(5) // 8 float3 T2WRow0 : TEXCOORD6;float3 T2WRow1 : TEXCOORD7;float3 T2WRow2 : TEXCOORD8;};sampler2D _MainTex;float4 _MainTex_ST; sampler2D _BumpMap;sampler2D _Metallic_AO_MASK_Smoothness;float4 _FresnelColor;float _FresnelScale;float _FresnelPower;UnityLight CreateDirectLight(v2f i){float3 lightDir;// float attenuation = 1;#if defined(DIRECTIONAL)lightDir = _WorldSpaceLightPos0.xyz;#elsefloat3 lightVec= _WorldSpaceLightPos0.xyz - i.worldPos; lightDir = normalize(lightVec);#endifUNITY_LIGHT_ATTENUATION(attenuation, i, i.worldPos); UnityLight light;light.color = _LightColor0.rgb * attenuation;light.dir = lightDir;light.ndotl = saturate(dot(lightDir,i.normal));return light;}UnityIndirect CreateIndirectLight (v2f i) {UnityIndirect indirectLight;indirectLight.diffuse = 0;indirectLight.specular = 0;#if defined(VERTEXLIGHT_ON)indirectLight.diffuse = i.vertexLightColor;#endif#if defined(_FORWADR_BASE)indirectLight.diffuse += max(0, ShadeSH9(float4(i.normal, 1)));#endifreturn indirectLight;}void CalcVertexLightColor(inout v2f i){#if defined(VERTEXLIGHT_ON)i.vertexLightColor = Shade4PointLights(unity_4LightPosX0, unity_4LightPosY0, unity_4LightPosZ0,unity_LightColor[0].rgb, unity_LightColor[1].rgb,unity_LightColor[2].rgb, unity_LightColor[3].rgb,unity_4LightAtten0, i.worldPos, i.normal);#endif}v2f vert (appdata v){v2f o;UNITY_INITIALIZE_OUTPUT(v2f,o);o.pos = UnityObjectToClipPos(v.vertex);o.uv = TRANSFORM_TEX(v.uv, _MainTex);o.normal = UnityObjectToWorldNormal(v.normal) ;o.worldPos = mul(unity_ObjectToWorld, v.vertex);CalcVertexLightColor(o);TRANSFER_SHADOW(o)UNITY_TRANSFER_FOG(o,o.pos);fixed3 worldNormal = o.normal;fixed3 worldTangent = UnityObjectToWorldDir( v.tangent.xyz );fixed tangentSign = v.tangent.w * unity_WorldTransformParams.w;fixed3 worldBinormal = cross( worldNormal, worldTangent ) * tangentSign;o.T2WRow0 = float3( worldTangent.x, worldBinormal.x, worldNormal.x); // * tNormal.xyzo.T2WRow1 = float3( worldTangent.y, worldBinormal.y, worldNormal.y);o.T2WRow2 = float3( worldTangent.z, worldBinormal.z, worldNormal.z);return o;}fixed4 frag (v2f i) : SV_Target{fixed4 albedo = tex2D(_MainTex, i.uv);float3 normalVal = UnpackNormal( tex2D(_BumpMap,i.uv));fixed4 metallic_AO_MASK_Smoothness = tex2D(_Metallic_AO_MASK_Smoothness, i.uv);float metallic = metallic_AO_MASK_Smoothness.r;float smoothness = metallic_AO_MASK_Smoothness.a;float occlusion = metallic_AO_MASK_Smoothness.g ;float3 viewDir = normalize(_WorldSpaceCameraPos - i.worldPos);#if defined(_FORWADR_BASE)float emissionMask = metallic_AO_MASK_Smoothness.b;float ndv = dot( normalize(i.normal), viewDir );float fresnel = pow(1 - ndv,_FresnelPower) * _FresnelScale ;float4 emission = fresnel * emissionMask * _FresnelColor;#endif i.normal = fixed3(dot(i.T2WRow0,normalVal), dot(i.T2WRow1,normalVal), dot(i.T2WRow2,normalVal));i.normal = normalize(i.normal);float oneMinusReflectivity ;float3 specularTint;albedo.rgb = DiffuseAndSpecularFromMetallic(albedo,metallic,specularTint,oneMinusReflectivity);UnityLight light = CreateDirectLight(i);UnityIndirect indirectLight = CreateIndirectLight(i);indirectLight.diffuse *= occlusion;indirectLight.specular *= occlusion;//light.color *= occlusion;float4 col = UNITY_BRDF_PBS(albedo,specularTint,oneMinusReflectivity,smoothness,i.normal,viewDir,light,indirectLight);UNITY_APPLY_FOG(i.fogCoord, col); #if defined(_FORWADR_BASE)col += emission;#endif return col;}#endif
附资源百度云：
链接: /s/1UdDCnt6uEfhy5IPNnEam5g
提取码: 9b6s
