snoopy/include/hittable.h

#pragma once

#include "rtweekend.h"
#include "ray.h"

class material;

struct hit_record
{
    point3                  p;
    vec3                    normal;
    shared_ptr<material>    mat_ptr;
    double                  t;
    bool                    front_face;

    inline void set_face_normal(const ray& r, const vec3& outward_normal)
    {
        front_face = dot(r.direction(), outward_normal) < 0;
        normal = front_face ? outward_normal : -outward_normal;
    }
};

class hittable
{
    public:
        virtual bool hit(const ray& r, double tMin, double tMax, hit_record& rec) const = 0;
};