参考博客：/u010333737/article/details/82287853
// 崩坏3 光照公式// tex * Ce * Pe * Weight + (tex * Csky * Pdif + Csky * Cspec * Pspec) * (1 - Weight)// 即 自发光 * Weight + （漫反射光 + 镜面高光）* (1 - Weight)Shader "MyShader/mihoyo/bh3"{Properties{// 基础贴图_MainTex ("Main Texture", 2D) = "white" {}// 光照贴图_LightTex ("Light Map Texture", 2D) = "white" {}//_LightShadowRange("Shadow Range", Range(0, 1)) = 0.5// 权重_Weight("Weight", Range(0, 1)) = 0.5// 自发光参数_Emission("Emission", Range(0, 1)) = 1_EmissionColor("Emission Color", Color) = (1,1,1,1)//_EmissionBloomFactor("Emission Bloom Factor", Range(0, 1)) = 0.9// 漫反射参数，分三层过渡_DiffuseColor("Diffuse Color", Color) = (1,1,1,1)_FirstShadowColor("1st Shadow Color", Color) = (0.8,0.8,0.8,1)_FirstShadowLine("1st Shadow Line", Range(0, 1)) = 0.5_SecondShadowColor("2nd Shadow Color", Color) = (0.5,0.5,0.5,1)_SecondShadowLine("2nd Shadow Line", Range(0, 1)) = 0.2//_ThirdShadowColor("3rd Shadow Color", Color) = (0.2,0.2,0.2,1)// 高光参数_SpecularColor("Specular Color", Color) = (1,1,1,1)_SpecularLine("Specular Line", Range(0, 1)) = 0.5_Gloss("_Gloss", Range(1, 255)) = 8// 描边_OutLineColor("Outline Color", Color) = (0,0,0,0)_OutLineWidth("Outline Width", Range(0, 100)) = 50}SubShader{Tags {"RenderType"="Opaque" }LOD 100Pass{CGPROGRAM#pragma vertex vert#pragma fragment frag// make fog work#pragma multi_compile_fog#include "UnityCG.cginc"#include "Lighting.cginc"sampler2D _MainTex;float4 _MainTex_ST;sampler2D _LightTex;float4 _LightTex_ST;float _LightShadowRange;float _Weight;float _Emission;fixed4 _EmissionColor;float _EmissionBloomFactor;fixed4 _DiffuseColor;fixed4 _FirstShadowColor;float _FirstShadowLine;fixed4 _SecondShadowColor;float _SecondShadowLine;//fixed4 _ThirdShadowColor;fixed4 _SpecularColor;float _SpecularLine;float _Gloss;struct appdata{float4 vertex : POSITION;float3 normal: NORMAL;float4 texcoord : TEXCOORD0;fixed4 color : COLOR;};struct v2f{float4 vertex : SV_POSITION;fixed3 worldNormal: TEXCOORD0;fixed3 worldPos: TEXCOORD1;fixed4 uv: TEXCOORD2;fixed4 vertColor : TEXCOORD3;};v2f vert (appdata v){v2f o;o.vertex = UnityObjectToClipPos(v.vertex); o.worldNormal = UnityObjectToWorldNormal(v.normal);o.worldPos = normalize(mul(unity_ObjectToWorld, v.vertex).xyz);o.uv.xy = TRANSFORM_TEX(v.texcoord, _MainTex);o.uv.zw = TRANSFORM_TEX(v.texcoord, _LightTex);o.vertColor = v.color;return o;}fixed4 frag (v2f i) : SV_Target{// 法线fixed3 worldNormal = normalize(i.worldNormal);// 光照fixed3 worldLightDir = normalize(_WorldSpaceLightPos0.xyz);// 相机fixed3 worldViewDir = normalize(UnityWorldSpaceViewDir(i.worldPos));//fixed3 worldHalfDir = normalize(worldLightDir+worldViewDir);// 半兰伯特模型float halfLambert = dot(worldNormal, worldLightDir) * 0.5 + 0.5;fixed4 mainTex = tex2D(_MainTex, i.uv.xy); // 基本色fixed4 lightTex = tex2D(_LightTex, i.uv.zw); // 光照贴图// 环境光fixed3 ambient = UNITY_LIGHTMODEL_AMBIENT.xyz * mainTex.rgb;// 计算自发光fixed3 emission;emission.rgb = mainTex.rgb * _Emission * _EmissionColor.rgb;// 计算漫反射fixed3 diffuse = fixed3(0,0,0);float diffuseMask = lightTex.g;if(diffuseMask > 0.1) {float firstMask = diffuseMask > 0.5 ? diffuseMask * 1.2 - 0.1 : diffuseMask * 1.25 - 0.125;bool isLight = (firstMask + halfLambert) * 0.5 > _FirstShadowLine;diffuse = isLight ? mainTex.rgb : mainTex.rgb * _FirstShadowColor.rgb;} else {bool isFirst = (diffuseMask + halfLambert) * 0.5 > _SecondShadowLine;diffuse = isFirst ? mainTex.rgb * _FirstShadowColor.rgb : mainTex.rgb * _SecondShadowColor.rgb;}diffuse *= _DiffuseColor.rgb * _LightColor0.rgb;// 计算高光float specularLight = pow(max(0, dot(worldNormal, worldHalfDir)), _Gloss);float3 specular = float3(0,0,0);if(lightTex.g != 1 && lightTex.r !=1){if((specularLight + lightTex.b) > 1.0 ) {if(halfLambert > _SpecularLine) {specular = lightTex.b * _SpecularColor.rgb; }}}specular *= _LightColor0.rgb;// 最终颜色fixed4 color = fixed4(_Weight * emission + ( 1 - _Weight) * (diffuse + specular), 1);// _Weight * emission + ( 1 - _Weight) * colorreturn color;}ENDCG}Pass {// outline 外轮廓线Name "Outline"Cull FrontCGPROGRAM#pragma vertex vert#pragma fragment frag#include "UnityCG.cginc"#pragma fragmentoption ARB_precision_hint_fastest // 最快速精度fixed _OutLineWidth;fixed4 _OutLineColor;float4 vert (float4 vertex : POSITION, float3 normal : NORMAL) : SV_POSITION {return UnityObjectToClipPos(vertex + normal * _OutLineWidth * 0.0000001);}fixed4 frag () : SV_Target {return _OutLineColor; }ENDCG}}Fallback "VertexLit"}
