ray.h

#ifndef RAY_H
#define RAY_H

#include "vector.h"

class Ray {
public:
    Ray() {}
    Ray(const Vector3D &a, const Vector3D &b) : m_vA(a), m_vB(b) {
        m_vA = a; m_vB = b; 
        m_vInvDir = 1 / m_vB; 
        m_iSign[0] = (m_vInvDir.x() < 0); 
        m_iSign[1] = (m_vInvDir.y() < 0); 
        m_iSign[2] = (m_vInvDir.z() < 0); 
        m_vUnitDirection = UnitVector(m_vB); 
    }

    Vector3D Origin() const { return m_vA; } 
    Vector3D Direction() const { return m_vB; } 
    Vector3D PointAtParameter(double t) const { return m_vA + t * m_vB; } 
    
    int m_iSign[3]; 
    Vector3D m_vA; 
    Vector3D m_vB; 
    Vector3D m_vInvDir; 
    Vector3D m_vUnitDirection; 
};
#endif // RAY_H