unity 眼球效果 eyes shader

上图

注意：为了避免虹膜在莫个光照角度产生平板光，需要把模型虹膜部分微微往下凹
上shader 眼睛部分和眼睛前面晶体部分是分开2个shader
眼睛部分

Shader "Hero/Eye" {Properties{//cornea角膜 //Iris虹膜  黑眼球//sclera巩膜 眼白_Lum("Luminance", Range(0, 10)) = 4_MainTex("Base (RGB)", 2D) = "white" {}_IrisColor("cornea Color", Color) = (1, 1, 1, 1)_SCCornea("Specular Color", Color) = (1, 1, 1, 1)_NormalIrisTex("NormalIrisTex (RGB)", 2D) = "white" {}_NormalIrisDetialTex("Normal Iris Detial Tex (RGB)", 2D) = "white" {}_GLCornea("gloss", Range(0, 2)) = 0.5_GLIris("Iris Gloss", Range(0, 2)) = 0.5_SPIris("Iris Specular Power", Range(1, 100)) = 20_ReflAmount("ReflAmount", Range(0, 2)) = 1_Cubemap("CubeMap", CUBE) = ""{}
}SubShader{pass{Tags{ "LightMode" = "ForwardBase" }Cull BackCGPROGRAM#pragma vertex vert#pragma fragment frag#include "UnityCG.cginc"float _SPIris;float _Lum;float  _ReflAmount;samplerCUBE _Cubemap;float4 _LightColor0;float4 _SCCornea;float4 _IrisColor;float _GLCornea;float _GLIris;sampler2D _MainTex;sampler2D _NormalIrisTex;sampler2D _NormalIrisDetialTex;float4 _MainTex_ST;struct v2f {float4 pos : SV_POSITION;float2 uv_MainTex : TEXCOORD0;float3 lightDir : TEXCOORD1;float3 viewDir : TEXCOORD2;float3 normal : TEXCOORD3;};v2f vert(appdata_full v) {v2f o;o.pos = UnityObjectToClipPos(v.vertex);o.normal = v.normal;o.lightDir = ObjSpaceLightDir(v.vertex);o.viewDir = ObjSpaceViewDir(v.vertex);o.uv_MainTex = TRANSFORM_TEX(v.texcoord, _MainTex);return o;}#define PIE 3.1415926535   float4 frag(v2f i) :COLOR{float3 viewDir = normalize(i.viewDir);float3 lightDir = normalize(i.lightDir);float3 H = normalize(lightDir + viewDir);float3 N = normalize(i.normal);float3 c = tex2D(_MainTex, i.uv_MainTex);/**这部分是关于虹膜的漫反射颜色，只是颜色*/c=c*_IrisColor;/**这部分是计算角膜的PBR镜面反射*/float _SP;_SP =pow(8192, _GLCornea);float d = (_SP + 2) / (8 * PIE) * pow(clamp(dot(N, H),0,1), _SP);float f = _SCCornea + (1 - _SCCornea)*pow(2, -10 * dot(H, lightDir));float k = min(1, _GLCornea + 0.545);float v = 1 / (k* dot(viewDir, H)*dot(viewDir, H) + (1 - k));float SpecIns = d*f*v;/**这部分是计算虹膜和巩膜的PBR镜面反射*/float3 n2;n2 = UnpackNormal(tex2D(_NormalIrisTex, i.uv_MainTex));_SP = pow(8192, _GLIris);d = (_SP + 2) / (8 * PIE) * pow(clamp(dot(n2, H),0,1), _SP);f = _SCCornea + (1 - _SCCornea)*pow(2, -10 * dot(H, lightDir));k = min(1, _GLIris + 0.545);v = 1 / (k* dot(viewDir, H)*dot(viewDir, H) + (1 - k));float3 refDir = reflect(-viewDir, N);float3 ref = texCUBElod(_Cubemap, float4(refDir, 0.5 - _GLCornea*0.5)).rgb;float3 diff;float roughSpecIns = d*f*v;diff = dot(lightDir, UnpackNormal(tex2D(_NormalIrisDetialTex, i.uv_MainTex)));float3 roughSpec = roughSpecIns*c;return float4(c *(diff)* _Lum + roughSpec * _SPIris + SpecIns + Luminance(ref)* _ReflAmount, 1) * _LightColor0;}ENDCG}}
}

眼睛前面晶体部分

Shader "Hero/EyeCrystal" {Properties{//cornea角膜 //Iris虹膜  黑眼球//sclera巩膜 眼白_AlphaVal ("AlphaVal", Float) = 0.5_BaseColor("Base Color", Color) = (1, 1, 1, 1)_SCCornea("Specular Color", Color) = (1, 1, 1, 1)_GLCornea("gloss", Range(0, 2)) = 0.5_ReflAmount("ReflAmount", Range(0, 2)) = 1_Cubemap("CubeMap", CUBE) = ""{}
}SubShader{pass{Tags{ "LightMode" = "ForwardBase" "RenderType" = "Transparent"}Blend One OneMinusSrcAlphaCull BackCGPROGRAM#pragma vertex vert#pragma fragment frag#include "UnityCG.cginc"float _AlphaVal;float  _ReflAmount;samplerCUBE _Cubemap;float4 _LightColor0;float4 _SCCornea;float4 _BaseColor;float _GLCornea;struct v2f {float4 pos : SV_POSITION;float2 uv_MainTex : TEXCOORD0;float3 lightDir : TEXCOORD1;float3 viewDir : TEXCOORD2;float3 normal : TEXCOORD3;};v2f vert(appdata_full v) {v2f o;o.pos = UnityObjectToClipPos(v.vertex);o.normal = v.normal;o.lightDir = ObjSpaceLightDir(v.vertex);o.viewDir = ObjSpaceViewDir(v.vertex);return o;}#define PIE 3.1415926535 float4 frag(v2f i) :COLOR{float3 viewDir = normalize(i.viewDir);float3 lightDir = normalize(i.lightDir);float3 H = normalize(lightDir + viewDir);float3 N = normalize(i.normal);/**这部分是关于虹膜的漫反射颜色，只是颜色*/float3 c=_BaseColor;/**这部分是计算角膜的PBR镜面反射*/float _SP;_SP =pow(8192, _GLCornea);float d = (_SP + 2) / (8 * PIE) * pow(clamp(dot(N, H),0,1), _SP);float f = _SCCornea + (1 - _SCCornea)*pow(2, -10 * dot(H, lightDir));float k = min(1, _GLCornea + 0.545);float v = 1 / (k* dot(viewDir, H)*dot(viewDir, H) + (1 - k));float SpecIns = d*f*v;float3 refDir = reflect(-viewDir, N);float3 ref = texCUBElod(_Cubemap, float4(refDir, 0.5 - _GLCornea*0.5)).rgb;float4 r_color = float4(c  + SpecIns + Luminance(ref)* _ReflAmount, 1) * _LightColor0 * _SCCornea;r_color.a=_AlphaVal;return r_color;}ENDCG}}
}

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