box.h

//==================================================================================================
// Written in 2016 by Peter Shirley <ptrshrl@gmail.com>
//
// To the extent possible under law, the author(s) have dedicated all copyright and related and
// neighboring rights to this software to the public domain worldwide. This software is distributed
// without any warranty.
//
// You should have received a copy (see file COPYING.txt) of the CC0 Public Domain Dedication along
// with this software. If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
//==================================================================================================

#ifndef BOXH
#define BOXH

#include "aarect.h"
#include "hitable_list.h"

class box: public hitable  {
    public:
        box() {}
        box(const vec3& p0, const vec3& p1, material *ptr);
        virtual bool hit(const ray& r, float t0, float t1, hit_record& rec) const;
        virtual bool bounding_box(float t0, float t1, aabb& box) const {
               box =  aabb(pmin, pmax);
               return true; }
        vec3 pmin, pmax;
        hitable *list_ptr;
};

box::box(const vec3& p0, const vec3& p1, material *ptr) {
    pmin = p0;
    pmax = p1;
    hitable **list = new hitable*[6];
    list[0] = new xy_rect(p0.x(), p1.x(), p0.y(), p1.y(), p1.z(), ptr);
    list[1] = new flip_normals(new xy_rect(p0.x(), p1.x(), p0.y(), p1.y(), p0.z(), ptr));
    list[2] = new xz_rect(p0.x(), p1.x(), p0.z(), p1.z(), p1.y(), ptr);
    list[3] = new flip_normals(new xz_rect(p0.x(), p1.x(), p0.z(), p1.z(), p0.y(), ptr));
    list[4] = new yz_rect(p0.y(), p1.y(), p0.z(), p1.z(), p1.x(), ptr);
    list[5] = new flip_normals(new yz_rect(p0.y(), p1.y(), p0.z(), p1.z(), p0.x(), ptr));
    list_ptr = new hitable_list(list,6);
}

bool box::hit(const ray& r, float t0, float t1, hit_record& rec) const {
    return list_ptr->hit(r, t0, t1, rec);
}

#endif