text: #include "fresnel.h"
  
  Color3f FresnelDielectric::Evaluate(float cosThetaI) const
  {
      return Color3f(FrDielectric(cosThetaI, etaI, etaT));
  }
  
  Color3f FresnelConductor::Evaluate(Float cosThetaI) const {
      return FrConductor(std::abs(cosThetaI), etaI, etaT, k);
  }
  