hittable.h

//
// Created by 13240 on 2025/10/14.
//

#ifndef SIMPLE_SOFTRT_HITTABLE_H
#define SIMPLE_SOFTRT_HITTABLE_H

#include "aabb.h"

class material;

class hit_record {
public:
    point3 p;
    vec3 normal;
    std::shared_ptr<material> mat;
    double t;
    double u;
    double v;
    bool front_face;

    void set_face_normal(const ray &r, const vec3 &outward_normal) {
        // Sets the hit record normal vector.
        // NOTE: the parameter `outward_normal` is assumed to have unit length.
        front_face = dot(r.direction(), outward_normal) < 0;
        normal = front_face ? outward_normal : -outward_normal; // 判断是否反转法线
    }
};

class hittable {
public:
    virtual ~hittable() = default;

    virtual bool hit(const ray &r, interval ray_t, hit_record &rec) const = 0;

    virtual aabb bounding_box() const = 0;
};

#endif //SIMPLE_SOFTRT_HITTABLE_H