vs2010做的网站,淘宝购物券网站怎么做,php网页制作作业,网站建设和维护工作文章目录 前言现在我们主要来看Standard的 漫反射 和 镜面反射一、PBS的核心计算BRDF二、Standard的镜面高光颜色三、具体的BRDF计算对于BRDF的具体计算#xff0c;在下篇文章中#xff0c;继续解析 四、最终代码.cginc文件Shader文件 前言
在上篇文章中#xff0c;我们解析… 文章目录 前言现在我们主要来看Standard的 漫反射 和 镜面反射一、PBS的核心计算BRDF二、Standard的镜面高光颜色三、具体的BRDF计算对于BRDF的具体计算在下篇文章中继续解析 四、最终代码.cginc文件Shader文件 前言
在上篇文章中我们解析了Standard的GI实现这篇文章我们来解析一下Standard的PBS计算。
Unity中Shader的Standard材质解析二 上篇文章中主要解析了这个公式 GI漫反射 和 GI镜面反射 现在我们主要来看Standard的 漫反射 和 镜面反射 一、PBS的核心计算BRDF LightingStandard1(o, worldViewDir, gi) 在该函数中主要进行了如下计算 二、Standard的镜面高光颜色 s.Albedo DiffuseAndSpecularFromMetallic1 (s.Albedo, s.Metallic, /out/ specColor, /out/ oneMinusReflectivity); 这里漫反射的反射率oneMinusReflectivity推导公式如下 lerp(A,B,v) A v(B - A) 三、具体的BRDF计算 #error 错误信息 会在控制台输出错误信息并且报错后Shader不会渲染
我们在片元着色器返回物体颜色前测试一下 可以看见我们控制台输出了错误信息 对于BRDF的具体计算在下篇文章中继续解析
UNITY_PBS_USE_BRDF3UNITY_PBS_USE_BRDF2UNITY_PBS_USE_BRDF1 四、最终代码
.cginc文件
#ifndef MYPHYSICALLYBASERENDERING_INCLUDE#define MYPHYSICALLYBASERENDERING_INCLUDE//Standard的漫反射和镜面反射计算↓// Main Physically Based BRDF// Derived from Disney work and based on Torrance-Sparrow micro-facet model//// BRDF kD / pi kS * (D * V * F) / 4// I BRDF * NdotL//// * NDF (depending on UNITY_BRDF_GGX):// a) Normalized BlinnPhong// b) GGX// * Smith for Visiblity term// * Schlick approximation for Fresnelhalf4 BRDF1_Unity_PBS1 (half3 diffColor, half3 specColor, half oneMinusReflectivity, half smoothness,float3 normal, float3 viewDir,UnityLight light, UnityIndirect gi){float perceptualRoughness SmoothnessToPerceptualRoughness (smoothness);float3 halfDir Unity_SafeNormalize (float3(light.dir) viewDir);// NdotV should not be negative for visible pixels, but it can happen due to perspective projection and normal mapping// In this case normal should be modified to become valid (i.e facing camera) and not cause weird artifacts.// but this operation adds few ALU and users may not want it. Alternative is to simply take the abs of NdotV (less correct but works too).// Following define allow to control this. Set it to 0 if ALU is critical on your platform.// This correction is interesting for GGX with SmithJoint visibility function because artifacts are more visible in this case due to highlight edge of rough surface// Edit: Disable this code by default for now as it is not compatible with two sided lighting used in SpeedTree.#define UNITY_HANDLE_CORRECTLY_NEGATIVE_NDOTV 0#if UNITY_HANDLE_CORRECTLY_NEGATIVE_NDOTV// The amount we shift the normal toward the view vector is defined by the dot product.half shiftAmount dot(normal, viewDir);normal shiftAmount 0.0f ? normal viewDir * (-shiftAmount 1e-5f) : normal;// A re-normalization should be applied here but as the shift is small we dont do it to save ALU.//normal normalize(normal);float nv saturate(dot(normal, viewDir)); // TODO: this saturate should no be necessary here#elsehalf nv abs(dot(normal, viewDir)); // This abs allow to limit artifact#endiffloat nl saturate(dot(normal, light.dir));float nh saturate(dot(normal, halfDir));half lv saturate(dot(light.dir, viewDir));half lh saturate(dot(light.dir, halfDir));// Diffuse termhalf diffuseTerm DisneyDiffuse(nv, nl, lh, perceptualRoughness) * nl;// Specular term// HACK: theoretically we should divide diffuseTerm by Pi and not multiply specularTerm!// BUT 1) that will make shader look significantly darker than Legacy ones// and 2) on engine side Non-important lights have to be divided by Pi too in cases when they are injected into ambient SHfloat roughness PerceptualRoughnessToRoughness(perceptualRoughness);#if UNITY_BRDF_GGX// GGX with roughtness to 0 would mean no specular at all, using max(roughness, 0.002) here to match HDrenderloop roughtness remapping.roughness max(roughness, 0.002);float V SmithJointGGXVisibilityTerm (nl, nv, roughness);float D GGXTerm (nh, roughness);#else// Legacyhalf V SmithBeckmannVisibilityTerm (nl, nv, roughness);half D NDFBlinnPhongNormalizedTerm (nh, PerceptualRoughnessToSpecPower(perceptualRoughness));#endiffloat specularTerm V*D * UNITY_PI; // Torrance-Sparrow model, Fresnel is applied later# ifdef UNITY_COLORSPACE_GAMMAspecularTerm sqrt(max(1e-4h, specularTerm));# endif// specularTerm * nl can be NaN on Metal in some cases, use max() to make sure its a sane valuespecularTerm max(0, specularTerm * nl);#if defined(_SPECULARHIGHLIGHTS_OFF)specularTerm 0.0;#endif// surfaceReduction Int D(NdotH) * NdotH * Id(NdotL0) dH 1/(roughness^21)half surfaceReduction;# ifdef UNITY_COLORSPACE_GAMMAsurfaceReduction 1.0-0.28*roughness*perceptualRoughness; // 1-0.28*x^3 as approximation for (1/(x^41))^(1/2.2) on the domain [0;1]# elsesurfaceReduction 1.0 / (roughness*roughness 1.0); // fade \in [0.5;1]# endif// To provide true Lambert lighting, we need to be able to kill specular completely.specularTerm * any(specColor) ? 1.0 : 0.0;half grazingTerm saturate(smoothness (1-oneMinusReflectivity));half3 color diffColor * (gi.diffuse light.color * diffuseTerm) specularTerm * light.color * FresnelTerm (specColor, lh) surfaceReduction * gi.specular * FresnelLerp (specColor, grazingTerm, nv);return half4(color, 1);}// Based on Minimalist CookTorrance BRDF// Implementation is slightly different from original derivation: http://www.thetenthplanet.de/archives/255//// * NDF (depending on UNITY_BRDF_GGX):// a) BlinnPhong// b) [Modified] GGX// * Modified Kelemen and Szirmay-Kalos for Visibility term// * Fresnel approximated with 1/LdotHhalf4 BRDF2_Unity_PBS1 (half3 diffColor, half3 specColor, half oneMinusReflectivity, half smoothness,float3 normal, float3 viewDir,UnityLight light, UnityIndirect gi){float3 halfDir Unity_SafeNormalize (float3(light.dir) viewDir);half nl saturate(dot(normal, light.dir));float nh saturate(dot(normal, halfDir));half nv saturate(dot(normal, viewDir));float lh saturate(dot(light.dir, halfDir));// Specular termhalf perceptualRoughness SmoothnessToPerceptualRoughness (smoothness);half roughness PerceptualRoughnessToRoughness(perceptualRoughness);#if UNITY_BRDF_GGX// GGX Distribution multiplied by combined approximation of Visibility and Fresnel// See Optimizing PBR for Mobile from Siggraph 2015 moving mobile graphics course// https://community.arm.com/events/1155float a roughness;float a2 a*a;float d nh * nh * (a2 - 1.f) 1.00001f;#ifdef UNITY_COLORSPACE_GAMMA// Tighter approximation for Gamma only rendering mode!// DVF sqrt(DVF);// DVF (a * sqrt(.25)) / (max(sqrt(0.1), lh)*sqrt(roughness .5) * d);float specularTerm a / (max(0.32f, lh) * (1.5f roughness) * d);#elsefloat specularTerm a2 / (max(0.1f, lh*lh) * (roughness 0.5f) * (d * d) * 4);#endif// on mobiles (where half actually means something) denominator have risk of overflow// clamp below was added specifically to fix that, but dx compiler (we convert bytecode to metal/gles)// sees that specularTerm have only non-negative terms, so it skips max(0,..) in clamp (leaving only min(100,...))#if defined (SHADER_API_MOBILE)specularTerm specularTerm - 1e-4f;#endif#else// Legacyhalf specularPower PerceptualRoughnessToSpecPower(perceptualRoughness);// Modified with approximate Visibility function that takes roughness into account// Original ((n1)*N.H^n) / (8*Pi * L.H^3) didnt take into account roughness// and produced extremely bright specular at grazing angleshalf invV lh * lh * smoothness perceptualRoughness * perceptualRoughness; // approx ModifiedKelemenVisibilityTerm(lh, perceptualRoughness);half invF lh;half specularTerm ((specularPower 1) * pow (nh, specularPower)) / (8 * invV * invF 1e-4h);#ifdef UNITY_COLORSPACE_GAMMAspecularTerm sqrt(max(1e-4f, specularTerm));#endif#endif#if defined (SHADER_API_MOBILE)specularTerm clamp(specularTerm, 0.0, 100.0); // Prevent FP16 overflow on mobiles#endif#if defined(_SPECULARHIGHLIGHTS_OFF)specularTerm 0.0;#endif// surfaceReduction Int D(NdotH) * NdotH * Id(NdotL0) dH 1/(realRoughness^21)// 1-0.28*x^3 as approximation for (1/(x^41))^(1/2.2) on the domain [0;1]// 1-x^3*(0.6-0.08*x) approximation for 1/(x^41)#ifdef UNITY_COLORSPACE_GAMMAhalf surfaceReduction 0.28;#elsehalf surfaceReduction (0.6-0.08*perceptualRoughness);#endifsurfaceReduction 1.0 - roughness*perceptualRoughness*surfaceReduction;half grazingTerm saturate(smoothness (1-oneMinusReflectivity));half3 color (diffColor specularTerm * specColor) * light.color * nl gi.diffuse * diffColor surfaceReduction * gi.specular * FresnelLerpFast (specColor, grazingTerm, nv);return half4(color, 1);}sampler2D_float unity_NHxRoughness1;half3 BRDF3_Direct1(half3 diffColor, half3 specColor, half rlPow4, half smoothness){half LUT_RANGE 16.0; // must match range in NHxRoughness() function in GeneratedTextures.cpp// Lookup texture to save instructionshalf specular tex2D(unity_NHxRoughness1, half2(rlPow4, SmoothnessToPerceptualRoughness(smoothness))).r * LUT_RANGE;#if defined(_SPECULARHIGHLIGHTS_OFF)specular 0.0;#endifreturn diffColor specular * specColor;}half3 BRDF3_Indirect1(half3 diffColor, half3 specColor, UnityIndirect indirect, half grazingTerm, half fresnelTerm){half3 c indirect.diffuse * diffColor;c indirect.specular * lerp (specColor, grazingTerm, fresnelTerm);return c;}// Old school, not microfacet based Modified Normalized Blinn-Phong BRDF// Implementation uses Lookup texture for performance//// * Normalized BlinnPhong in RDF form// * Implicit Visibility term// * No Fresnel term//// TODO: specular is too weak in Linear rendering modehalf4 BRDF3_Unity_PBS1 (half3 diffColor, half3 specColor, half oneMinusReflectivity, half smoothness,float3 normal, float3 viewDir,UnityLight light, UnityIndirect gi){float3 reflDir reflect (viewDir, normal);half nl saturate(dot(normal, light.dir));half nv saturate(dot(normal, viewDir));// Vectorize Pow4 to save instructionshalf2 rlPow4AndFresnelTerm Pow4 (float2(dot(reflDir, light.dir), 1-nv)); // use R.L instead of N.H to save couple of instructionshalf rlPow4 rlPow4AndFresnelTerm.x; // power exponent must match kHorizontalWarpExp in NHxRoughness() function in GeneratedTextures.cpphalf fresnelTerm rlPow4AndFresnelTerm.y;half grazingTerm saturate(smoothness (1-oneMinusReflectivity));half3 color BRDF3_Direct1(diffColor, specColor, rlPow4, smoothness);color * light.color * nl;color BRDF3_Indirect1(diffColor, specColor, gi, grazingTerm, fresnelTerm);return half4(color, 1);}// Default BRDF to use://在 ProjectSetting-Graphics-TierSetting中设置//StandardShaderQuality low(UNITY_PBS_USE_BRDF3)//StandardShaderQuality Medium(UNITY_PBS_USE_BRDF2)//StandardShaderQuality High(UNITY_PBS_USE_BRDF1)#if !defined (UNITY_BRDF_PBS1) // allow to explicitly override BRDF in custom shader// still add safe net for low shader models, otherwise we might end up with shaders failing to compile#if SHADER_TARGET 30 || defined(SHADER_TARGET_SURFACE_ANALYSIS) // only need something for surface shader analysis pass; pick the cheap one#define UNITY_BRDF_PBS1 BRDF3_Unity_PBS1 //效果最差的BRDF#elif defined(UNITY_PBS_USE_BRDF3)#define UNITY_BRDF_PBS1 BRDF3_Unity_PBS1#elif defined(UNITY_PBS_USE_BRDF2)#define UNITY_BRDF_PBS1 BRDF2_Unity_PBS1#elif defined(UNITY_PBS_USE_BRDF1)#define UNITY_BRDF_PBS1 BRDF1_Unity_PBS1#else#error something broke in auto-choosing BRDF#endif#endifinline half OneMinusReflectivityFromMetallic1(half metallic){// Well need oneMinusReflectivity, so// 1-reflectivity 1-lerp(dielectricSpec, 1, metallic) lerp(1-dielectricSpec, 0, metallic)// store (1-dielectricSpec) in unity_ColorSpaceDielectricSpec.a, then// 1-reflectivity lerp(alpha, 0, metallic) alpha metallic*(0 - alpha) // alpha - metallic * alphahalf oneMinusDielectricSpec unity_ColorSpaceDielectricSpec.a;return oneMinusDielectricSpec - metallic * oneMinusDielectricSpec;}inline half3 DiffuseAndSpecularFromMetallic1 (half3 albedo, half metallic, out half3 specColor, out half oneMinusReflectivity){//计算镜面高光颜色//当metallic为0即非金属时返回unity_ColorSpaceDielectricSpec.rgb(0.04)//unity_ColorSpaceDielectricSpec.rgb表示的是绝缘体的通用反射颜色//迪士尼经大量测量用 0.04 来表示//当 metallic 1 时金属返回Albedo也就是物体本身的颜色specColor lerp (unity_ColorSpaceDielectricSpec.rgb, albedo, metallic);oneMinusReflectivity OneMinusReflectivityFromMetallic1(metallic);return albedo * oneMinusReflectivity;}//s : 物体表面数据信息//viewDir : 视线方向//gi : 全局光照GI漫反射 和 GI镜面反射inline half4 LightingStandard1 (SurfaceOutputStandard s, float3 viewDir, UnityGI gi){s.Normal normalize(s.Normal);half oneMinusReflectivity;//镜面高光颜色half3 specColor;s.Albedo DiffuseAndSpecularFromMetallic1 (s.Albedo, s.Metallic, /*out*/ specColor, /*out*/ oneMinusReflectivity);// shader relies on pre-multiply alpha-blend (_SrcBlend One, _DstBlend OneMinusSrcAlpha)// this is necessary to handle transparency in physically correct way - only diffuse component gets affected by alpha//当开启半透明模式时对 Alpha 进行相关计算half outputAlpha;s.Albedo PreMultiplyAlpha (s.Albedo, s.Alpha, oneMinusReflectivity, /*out*/ outputAlpha);//具体的BRDF计算//s.Albedo : 物体表面的基础颜色//specColor : 镜面反射颜色//oneMinusReflectivity : 漫反射率 1 - 镜面反射率//s.Smoothness : 物体表面的光滑度//s.Normal : 物体表面的法线//viewDir : 视线方向//gi.light : 直接光信息//gi.indirect : GI间接光信息half4 c UNITY_BRDF_PBS1 (s.Albedo, specColor, oneMinusReflectivity, s.Smoothness, s.Normal, viewDir, gi.light, gi.indirect);c.a outputAlpha;return c;}//Standard的GI计算↓half3 Unity_GlossyEnvironment1 (UNITY_ARGS_TEXCUBE(tex), half4 hdr, Unity_GlossyEnvironmentData glossIn){half perceptualRoughness glossIn.roughness /* perceptualRoughness */ ;// TODO: CAUTION: remap from Morten may work only with offline convolution, see impact with runtime convolution!// For now disabled#if 0float m PerceptualRoughnessToRoughness(perceptualRoughness); // m is the real roughness parameterconst float fEps 1.192092896e-07F; // smallest such that 1.0FLT_EPSILON ! 1.0 (1e-4h is NOT good here. is visibly very wrong)float n (2.0/max(fEps, m*m))-2.0; // remap to spec power. See eq. 21 in -- https://dl.dropboxusercontent.com/u/55891920/papers/mm_brdf.pdfn / 4; // remap from n_dot_h formulatino to n_dot_r. See section Pre-convolved Cube Maps vs Path Tracers -- https://s3.amazonaws.com/docs.knaldtech.com/knald/1.0.0/lys_power_drops.htmlperceptualRoughness pow( 2/(n2), 0.25); // remap back to square root of real roughness (0.25 include both the sqrt root of the conversion and sqrt for going from roughness to perceptualRoughness)#else// MM: came up with a surprisingly close approximation to what the #if 0ed out code above does.//r r * (1.7 - 0.7*r)//由于粗糙度与反射探针的mip变化不呈现线性正比所以需要一个公式来改变perceptualRoughness perceptualRoughness*(1.7 - 0.7*perceptualRoughness);#endif//UNITY_SPECCUBE_LOD_STEPS 6,表示反射探针的mip级别有 6 档。粗糙度X6得到最终得mip级别half mip perceptualRoughnessToMipmapLevel(perceptualRoughness);half3 R glossIn.reflUVW;half4 rgbm UNITY_SAMPLE_TEXCUBE_LOD(tex, R, mip);return DecodeHDR(rgbm, hdr);}//GI中的镜面反射inline half3 UnityGI_IndirectSpecular1(UnityGIInput data, half occlusion, Unity_GlossyEnvironmentData glossIn){half3 specular;//如果开启了反射探针的Box Projection#ifdef UNITY_SPECCUBE_BOX_PROJECTION// we will tweak reflUVW in glossIn directly (as we pass it to Unity_GlossyEnvironment twice for probe0 and probe1), so keep original to pass into BoxProjectedCubemapDirectionhalf3 originalReflUVW glossIn.reflUVW;glossIn.reflUVW BoxProjectedCubemapDirection (originalReflUVW, data.worldPos, data.probePosition[0], data.boxMin[0], data.boxMax[0]);#endif#ifdef _GLOSSYREFLECTIONS_OFFspecular unity_IndirectSpecColor.rgb;#elsehalf3 env0 Unity_GlossyEnvironment1 (UNITY_PASS_TEXCUBE(unity_SpecCube0), data.probeHDR[0], glossIn);//如果开启了反射探针混合#ifdef UNITY_SPECCUBE_BLENDINGconst float kBlendFactor 0.99999;float blendLerp data.boxMin[0].w;UNITY_BRANCHif (blendLerp kBlendFactor){#ifdef UNITY_SPECCUBE_BOX_PROJECTIONglossIn.reflUVW BoxProjectedCubemapDirection (originalReflUVW, data.worldPos, data.probePosition[1], data.boxMin[1], data.boxMax[1]);#endifhalf3 env1 Unity_GlossyEnvironment (UNITY_PASS_TEXCUBE_SAMPLER(unity_SpecCube1,unity_SpecCube0), data.probeHDR[1], glossIn);specular lerp(env1, env0, blendLerp);}else{specular env0;}#elsespecular env0;#endif#endifreturn specular * occlusion;}inline UnityGI UnityGlobalIllumination1 (UnityGIInput data, half occlusion, half3 normalWorld){return UnityGI_Base(data, occlusion, normalWorld);}//GI计算inline UnityGI UnityGlobalIllumination1 (UnityGIInput data, half occlusion, half3 normalWorld, Unity_GlossyEnvironmentData glossIn){//计算得出GI中的漫反射UnityGI o_gi UnityGI_Base(data, occlusion, normalWorld);//计算得出GI中的镜面反射o_gi.indirect.specular UnityGI_IndirectSpecular1(data, occlusion, glossIn);return o_gi;}float SmoothnessToPerceptualRoughness1(float smoothness){return (1 - smoothness);}Unity_GlossyEnvironmentData UnityGlossyEnvironmentSetup1(half Smoothness, half3 worldViewDir, half3 Normal, half3 fresnel0){Unity_GlossyEnvironmentData g;//粗糙度g.roughness /* perceptualRoughness */ SmoothnessToPerceptualRoughness1(Smoothness);//反射球的采样坐标g.reflUVW reflect(-worldViewDir, Normal);return g;}//PBR光照模型的GI计算inline void LightingStandard_GI1(SurfaceOutputStandard s,UnityGIInput data,inout UnityGI gi){//如果是延迟渲染PASS并且开启了延迟渲染反射探针的话#if defined(UNITY_PASS_DEFERRED) UNITY_ENABLE_REFLECTION_BUFFERSgi UnityGlobalIllumination1(data, s.Occlusion, s.Normal);#else//Unity_GlossyEnvironmentData表示GI中的反射准备数据Unity_GlossyEnvironmentData g UnityGlossyEnvironmentSetup1(s.Smoothness, data.worldViewDir, s.Normal,lerp(unity_ColorSpaceDielectricSpec.rgb, s.Albedo,s.Metallic));//进行GI计算并返回输出gigi UnityGlobalIllumination1(data, s.Occlusion, s.Normal, g);#endif}#endif
Shader文件
//Standard材质
Shader MyShader/P2_2_6
{Properties{_Color (Color, Color) (1,1,1,1)_MainTex (Albedo (RGB), 2D) white {}[NoScaleOffset]_MetallicTex(Metallic(R) Smoothness(G) AO(B),2D) white {}[NoScaleOffset][Normal]_NormalTex(NormalTex,2D) bump {}_Glossiness (Smoothness, Range(0,1)) 0.0_Metallic (Metallic, Range(0,1)) 0.0_AO(AO,Range(0,1)) 1.0}SubShader{Tags{RenderTypeOpaque}LOD 200// ---- forward rendering base pass:Pass{Name FORWARDTags{LightMode ForwardBase}CGPROGRAM// compile directives#pragma vertex vert#pragma fragment frag#pragma target 3.0#pragma multi_compile_instancing#pragma multi_compile_fog#pragma multi_compile_fwdbase#include UnityCG.cginc#include Lighting.cginc#include UnityPBSLighting.cginc#include AutoLight.cginc#include CGInclude/MyPhysicallyBasedRendering.cgincsampler2D _MainTex;float4 _MainTex_ST;half _Glossiness;half _Metallic;fixed4 _Color;sampler2D _MetallicTex;half _AO;sampler2D _NormalTex;struct appdata{float4 vertex : POSITION;float4 tangent : TANGENT;float3 normal : NORMAL;float4 texcoord : TEXCOORD0;float4 texcoord1 : TEXCOORD1;float4 texcoord2 : TEXCOORD2;float4 texcoord3 : TEXCOORD3;fixed4 color : COLOR;UNITY_VERTEX_INPUT_INSTANCE_ID};// vertex-to-fragment interpolation data// no lightmaps:struct v2f{float4 pos : SV_POSITION;float2 uv : TEXCOORD0; // _MainTexfloat3 worldNormal : TEXCOORD1;float3 worldPos : TEXCOORD2;#if UNITY_SHOULD_SAMPLE_SHhalf3 sh : TEXCOORD3; // SH#endif//切线空间需要使用的矩阵float3 tSpace0 : TEXCOORD4;float3 tSpace1 : TEXCOORD5;float3 tSpace2 : TEXCOORD6;UNITY_FOG_COORDS(7)UNITY_SHADOW_COORDS(8)};// vertex shaderv2f vert(appdata v){v2f o;o.pos UnityObjectToClipPos(v.vertex);o.uv.xy TRANSFORM_TEX(v.texcoord, _MainTex);float3 worldPos mul(unity_ObjectToWorld, v.vertex).xyz;float3 worldNormal UnityObjectToWorldNormal(v.normal);//世界空间下的切线half3 worldTangent UnityObjectToWorldDir(v.tangent);//切线方向half tangentSign v.tangent.w * unity_WorldTransformParams.w;//世界空间下的副切线half3 worldBinormal cross(worldNormal, worldTangent) * tangentSign;//切线矩阵o.tSpace0 float3(worldTangent.x, worldBinormal.x, worldNormal.x);o.tSpace1 float3(worldTangent.y, worldBinormal.y, worldNormal.y);o.tSpace2 float3(worldTangent.z, worldBinormal.z, worldNormal.z);o.worldPos.xyz worldPos;o.worldNormal worldNormal;// SH/ambient and vertex lights#if UNITY_SHOULD_SAMPLE_SH !UNITY_SAMPLE_FULL_SH_PER_PIXELo.sh 0;// Approximated illumination from non-important point lights#ifdef VERTEXLIGHT_ONo.sh 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, worldPos, worldNormal);#endifo.sh ShadeSHPerVertex (worldNormal, o.sh);#endifUNITY_TRANSFER_LIGHTING(o, v.texcoord1.xy);UNITY_TRANSFER_FOG(o, o.pos); // pass fog coordinates to pixel shaderreturn o;}// fragment shaderfixed4 frag(v2f i) : SV_Target{UNITY_EXTRACT_FOG(i);float3 worldPos i.worldPos.xyz;float3 worldViewDir normalize(UnityWorldSpaceViewDir(worldPos));SurfaceOutputStandard o;UNITY_INITIALIZE_OUTPUT(SurfaceOutputStandard, o);fixed4 mainTex tex2D(_MainTex, i.uv);o.Albedo mainTex.rgb * _Color;o.Emission 0.0;fixed4 metallicTex tex2D(_MetallicTex, i.uv);o.Metallic metallicTex.r * _Metallic;o.Smoothness metallicTex.g * _Glossiness;o.Occlusion metallicTex.b * _AO;o.Alpha 1;half3 normalTex UnpackNormal(tex2D(_NormalTex,i.uv));half3 worldNormal half3(dot(i.tSpace0,normalTex),dot(i.tSpace1,normalTex),dot(i.tSpace2,normalTex));o.Normal worldNormal;// compute lighting shadowing factorUNITY_LIGHT_ATTENUATION(atten, i, worldPos)// Setup lighting environmentUnityGI gi;UNITY_INITIALIZE_OUTPUT(UnityGI, gi);gi.indirect.diffuse 0;gi.indirect.specular 0;gi.light.color _LightColor0.rgb;gi.light.dir _WorldSpaceLightPos0.xyz;// Call GI (lightmaps/SH/reflections) lighting functionUnityGIInput giInput;UNITY_INITIALIZE_OUTPUT(UnityGIInput, giInput);giInput.light gi.light;giInput.worldPos worldPos;giInput.worldViewDir worldViewDir;giInput.atten atten;#if defined(LIGHTMAP_ON) || defined(DYNAMICLIGHTMAP_ON)giInput.lightmapUV IN.lmap;#elsegiInput.lightmapUV 0.0;#endif#if UNITY_SHOULD_SAMPLE_SH !UNITY_SAMPLE_FULL_SH_PER_PIXELgiInput.ambient i.sh;#elsegiInput.ambient.rgb 0.0;#endifgiInput.probeHDR[0] unity_SpecCube0_HDR;giInput.probeHDR[1] unity_SpecCube1_HDR;#if defined(UNITY_SPECCUBE_BLENDING) || defined(UNITY_SPECCUBE_BOX_PROJECTION)giInput.boxMin[0] unity_SpecCube0_BoxMin; // .w holds lerp value for blending#endif#ifdef UNITY_SPECCUBE_BOX_PROJECTIONgiInput.boxMax[0] unity_SpecCube0_BoxMax;giInput.probePosition[0] unity_SpecCube0_ProbePosition;giInput.boxMax[1] unity_SpecCube1_BoxMax;giInput.boxMin[1] unity_SpecCube1_BoxMin;giInput.probePosition[1] unity_SpecCube1_ProbePosition;#endifLightingStandard_GI1(o, giInput, gi);//return fixed4(gi.indirect.specular,1);// PBS的核心计算fixed4 c LightingStandard1(o, worldViewDir, gi);UNITY_APPLY_FOG(_unity_fogCoord, c); // apply fogUNITY_OPAQUE_ALPHA(c.a); //把c的Alpha置1#error 错了没(⊙o⊙)return c;}ENDCG}}}
