菲涅尔

菲涅尔现象

边缘光的效果

---

菲涅尔实现

---

float NdotV = dot(normalWS,viewWS);

float fresnel = pow(1 - NdotV, _FresnelPow);

---

Matcap

什么是MatCap

---

连连看

---

代码

float3 normalVS = normalize(TransformWorldToView(normalWS));
float2 matcapUV = normalVS.rg * 0.5 + 0.5;
float3 matcap = SAMPLE_TEXTURE2D(_Matcap,sampler_Matcap,matcapUV);
//颜色混合
float3 envSpecLighting = matcap * fresnel * _EnvIntensity;

---

CubeMap

什么是CubeMap？

---

连连看

---

代码

//变量定义
_CubeMap("环境贴图",Cube) = "_Skybox" {}
_CubeMip("环境贴图Mip",Range(1,7)) = 1

samplerCUBE _CubeMap;
float _CubeMip;

//片元着色器
float3 viewReflectWS = reflect(-viewWS,normalWS); 
float3 cubeMap = texCUBElod(_CubeMap,float4(viewReflectWS,_CubeMip)).rgb;

---

作业