内容还没完善，有时间会增加反射，各向异性处理等。相互学习。
Shader “water/fresnelpbr”
{
Properties
{
_MainTex (“Texture”, 2D) = “white” {}
_fresnelBase(“fresnelBase”, Range(0, 1)) = 1
_fresnelScale(“fresnelScale”, Range(0, 1)) = 1
_fresnelIndensity(“fresnelIndensity”, Range(0, 5)) = 5
_fresnelCol(“_fresnelCol”, Color) = (1,1,1,1)
_frequency(“频率”,Range(0,100)) = 1
_wavelength(“波长”,Range(0,100)) = 1
_magnitude(“振幅”,Range(0,100)) = 1
//pbr _Diffuse (“DiffuseColor” , Color) = (1,1,1,1) _DiffuseStrength (“DiffuseStrength”, float) = 1.0 _Specular (“SpecularColor”, Color) = (1,1,1,1) _SpecularStrength(“SpecularStrength”, float) = 1.0 _Gloss (“Gloss”, float) = 1.0}SubShader{Tags { “RenderType”=”Opaque” }LOD 100Pass{tags{“LightMode” = “ForwardBase”}CGPROGRAM#pragma vertex vert#pragma fragment frag#include “UnityCG.cginc”#include “Lighting.cginc”struct appdata{float4 vertex : POSITION;float2 uv : TEXCOORD0;float3 normal : NORMAL;};struct v2f{float2 uv : TEXCOORD0;float4 vertex : SV_POSITION;float3 worldlight : TEXCOORD1;float3 worldnormal : TEXCOORD2;float3 worldview : TEXCOORD3;};sampler2D _MainTex;float4 _MainTex_ST;float _fresnelBase;float _fresnelScale;float _fresnelIndensity;float4 _fresnelCol;float _frequency;float _wavelength;float _magnitude;//pbrfixed4 _Diffuse; float _DiffuseStrength; fixed4 _Specular; float _SpecularStrength; float _Gloss;v2f vert (appdata v){v2f o;v.vertex.y = v.vertex.y + _magnitude * sin(_frequency * _Time.y + _wavelength * (v.vertex.x + v.vertex.y + v.vertex.z));o.vertex = UnityObjectToClipPos(v.vertex);o.uv = TRANSFORM_TEX(v.uv, _MainTex);//将法线转到世界坐标o.worldnormal = mul(v.normal, (float3x3)unity_WorldToObject);//获取世界坐标的光向量o.worldlight = WorldSpaceLightDir(v.vertex);//获取世界坐标的视角向量o.worldview = WorldSpaceViewDir(v.vertex);return o;}fixed4 frag (v2f i) : SV_Target{fixed4 col = tex2D(_MainTex, i.uv);float3 worldnormal = normalize(i.worldnormal);float3 worldlight = normalize(i.worldlight);float3 worldview = normalize(i.worldview);//tsdrjb公式float fresnel = _fresnelBase + _fresnelScale*pow(1 – dot(worldnormal, worldview), _fresnelIndensity);//pbr fixed4 ambient = UNITY_LIGHTMODEL_AMBIENT.rgba; fixed4 lightColor = _LightColor0.rgba; fixed4 diffuse = 1 / UNITY_PI * _Diffuse * (dot(worldnormal ,worldlight) * 0.5 + 0.5) * _DiffuseStrength * lightColor; fixed4 specular = (8 + _Gloss) / (8 * UNITY_PI) * _Specular * _SpecularStrength * pow(saturate(dot(normalize(worldview + worldlight),worldnormal)),_Gloss)* lightColor; col = col * diffuse;col.rgb += lerp(col.rgb, _fresnelCol, fresnel) * _fresnelCol.a;col = col + ambient + specular;return col;}ENDCG}}
}