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aarect.h
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aarect.h
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#ifndef RAYTRACINGINONEWEEKEND_AARECT_H
#define RAYTRACINGINONEWEEKEND_AARECT_H
#include <utility>
#include "rtweekend.h"
#include "hittable.h"
class xy_rect : public hittable {
public:
double x0, x1, y0, y1, k;
shared_ptr<material> mp;
xy_rect() = default;
xy_rect(double _x0, double _x1, double _y0, double _y1, double _k, const shared_ptr<material> &mat) : x0(_x0),
x1(_x1),
y0(_y0),
y1(_y1),
k(_k),
mp(mat) {}
bool hit(const ray &r, double t_min, double t_max, hit_record &rec) const override;
bool bounding_box(double time0, double time1, aabb &output_box) const override {
output_box = aabb(point3(x0, y0, k - 0.0001), point3(x1, y1, k + 0.0001));
return true;
}
};
bool xy_rect::hit(const ray &r, double t_min, double t_max, hit_record &rec) const {
auto t = (k - r.origin().z()) / r.direction().z();
if (t < t_min || t > t_max)
return false;
auto x = r.origin().x() + t * r.direction().x();
auto y = r.origin().y() + t * r.direction().y();
if (x < x0 || x > x1 || y < y0 || y > y1)
return false;
rec.mat_ptr = mp;
vec3 outward_normal(0, 0, 1);
rec.set_face_normal(r, outward_normal);
rec.p = point3(x, y, k);
rec.t = t;
rec.u = (x - x0) / (x1 - x0);
rec.v = (y - y0) / (y1 - y0);
return true;
}
class xz_rect : public hittable {
public:
xz_rect() = default;
xz_rect(double _x0, double _x1, double _z0, double _z1, double _k, const shared_ptr<material> &mat) : x0(_x0),
x1(_x1),
z0(_z0),
z1(_z1),
k(_k),
mp(mat) {};
bool hit(const ray &r, double t_min, double t_max, hit_record &rec) const override;
bool bounding_box(double time0, double time1, aabb &output_box) const override {
output_box = aabb(point3(x0, k - 0.0001, z0), point3(x1, k + 0.0001, z1));
return true;
}
double pdf_value(const point3 &o, const vec3 &v) const override;
vec3 random(const vec3 &o) const override;
public:
shared_ptr<material> mp;
double x0, x1, z0, z1, k;
};
bool xz_rect::hit(const ray &r, double t_min, double t_max, hit_record &rec) const {
auto t = (k - r.origin().y()) / r.direction().y();
if (t < t_min || t > t_max)
return false;
auto x = r.origin().x() + t * r.direction().x();
auto z = r.origin().z() + t * r.direction().z();
if (x < x0 || x > x1 || z < z0 || z > z1)
return false;
rec.u = (x - x0) / (x1 - x0);
rec.v = (z - z0) / (z1 - z0);
rec.t = t;
auto outward_normal = vec3(0, 1, 0);
rec.set_face_normal(r, outward_normal);
rec.mat_ptr = mp;
rec.p = r.at(t);
return true;
}
double xz_rect::pdf_value(const point3 &o, const vec3 &v) const {
hit_record rec;
if (!this->hit(ray(o, v), 0.001, infinity, rec))
return 0;
auto area = (x1-x0)*(z1-z0);
auto distance_squared = rec.t * rec.t * v.length_squared();
auto cosine = fabs(dot(v, rec.normal) / v.length());
return distance_squared / (cosine * area);
}
vec3 xz_rect::random(const vec3 &o) const {
auto random_point = point3(random_double(x0,x1), k, random_double(z0,z1));
return random_point - o;
}
class yz_rect : public hittable {
public:
yz_rect() = default;
yz_rect(double _y0, double _y1, double _z0, double _z1, double _k, const shared_ptr<material> &mat) : y0(_y0),
y1(_y1),
z0(_z0),
z1(_z1),
k(_k),
mp(mat) {};
bool hit(const ray &r, double t_min, double t_max, hit_record &rec) const override;
bool bounding_box(double time0, double time1, aabb &output_box) const override {
output_box = aabb(point3(k - 0.0001, y0, z0), point3(k + 0.0001, y1, z1));
return true;
}
public:
shared_ptr<material> mp;
double y0, y1, z0, z1, k;
};
bool yz_rect::hit(const ray &r, double t_min, double t_max, hit_record &rec) const {
auto t = (k - r.origin().x()) / r.direction().x();
if (t < t_min || t > t_max)
return false;
auto y = r.origin().y() + t * r.direction().y();
auto z = r.origin().z() + t * r.direction().z();
if (y < y0 || y > y1 || z < z0 || z > z1)
return false;
rec.u = (y - y0) / (y1 - y0);
rec.v = (z - z0) / (z1 - z0);
rec.t = t;
auto outward_normal = vec3(1, 0, 0);
rec.set_face_normal(r, outward_normal);
rec.mat_ptr = mp;
rec.p = r.at(t);
return true;
}
#endif //RAYTRACINGINONEWEEKEND_AARECT_H