dielectric.h

#ifndef DIELECTRIC_H
#define DIELECTRIC_H

#include "material.h"

class Dielectric : public Material {
public:
    Dielectric(double ri) : m_dRefId(ri) {}
    static bool Refract(const Vector3D &v, const Vector3D &n, double NiOverNt, Vector3D &refracted) {
        Vector3D vUV = UnitVector(v);
        double dDT = vUV.Dot(n);
        double dDiscriminant = 1.0 - (NiOverNt * NiOverNt * (1 - dDT * dDT));
        if (dDiscriminant > 0) {
            refracted = NiOverNt * (vUV - (n * dDT)) - (n * sqrt(dDiscriminant));
            return true;
        }
        else return false;
    }

    virtual bool Scatter(const Ray &r_in, const HitRecord &rec, Vector3D &attenuation, Ray &scattered) const;
    virtual int MatType() const {
        return 2;
    }
    virtual Vector3D MatColor() const {
        return Vector3D(0);
    }
    virtual double MatFuzz() const {
        return 0;
    }
    virtual double MatRef() const {
        return m_dRefId;
    }
    double m_dRefId; 
};
#endif // DIELECTRIC_H