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hittable_list.h
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hittable_list.h
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#ifndef HITTABLE_LIST_H
#define HITTABLE_LIST_H
#include "hittable.h"
#include <memory>
#include <vector>
using std::shared_ptr;
using std::make_shared;
class hittable_list : public hittable {
public:
hittable_list() {}
hittable_list(shared_ptr<hittable> object) { add(object); }
/* constructs a hittable list
* @src_objects: Vector to initialize from
* @start: start index of vector (inclusive)
* @end: end index of vector (exclusive)
*/
hittable_list(std::vector<shared_ptr<hittable>>& src_objects, int start, int end) {
for (int i = start; i < end; i++) {
add(src_objects[i]);
}
}
void clear() { objects.clear(); }
void add(shared_ptr<hittable> object) { objects.push_back(object); }
virtual bool hit(
const Ray& r, double t_min, double t_max, hit_record& rec) const override;
virtual bool bounding_box(double time0, double time1, aabb& output_box) const override;
public:
std::vector<shared_ptr<hittable>> objects;
};
bool hittable_list::hit(const Ray& r, double t_min, double t_max, hit_record& rec) const {
hit_record temp_rec;
bool hit_anything = false;
auto closest_so_far = t_max;
for (const auto& object : objects) {
if (object->hit(r, t_min, closest_so_far, temp_rec)) {
hit_anything = true;
closest_so_far = temp_rec.t;
rec = temp_rec;
}
}
return hit_anything;
}
/* Constructs a bounding box for a hittable_list.
* @time0: t0 time interval for moving objects
* @time1: t1 time interval for moving objects
* @output_box: output bounding box
* Returns an AABB.
*/
bool hittable_list::bounding_box(double time0, double time1, aabb& output_box) const {
if (objects.empty()) return false;
aabb temp_box;
bool first_box = true;
for (const auto& object : objects) {
if (!object->bounding_box(time0, time1, temp_box)) return false;
output_box = first_box ? temp_box : surrounding_box(output_box, temp_box);
first_box = false;
}
return true;
}
#endif