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aarect.h
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aarect.h
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#ifndef AARECT_H
#define AARECT_H
#include "rtweekend.h"
#include "hittable.h"
class xy_rect : public hittable {
public:
xy_rect() {}
xy_rect(double _x0, double _x1, double _y0, double _y1, double _k,
shared_ptr<material> mat)
: x0(_x0), x1(_x1), y0(_y0), y1(_y1), k(_k), mp(mat) {};
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 {
// The bounding box must have non-zero width in each dimension, so pad the Z
// dimension a small amount.
output_box = aabb(point3(x0,y0, k-0.0001), point3(x1, y1, k+0.0001));
return true;
}
public:
shared_ptr<material> mp;
double x0, x1, y0, y1, k;
};
class xz_rect : public hittable {
public:
xz_rect() {}
xz_rect(double _x0, double _x1, double _z0, double _z1, double _k,
shared_ptr<material> mat)
: x0(_x0), x1(_x1), z0(_z0), z1(_z1), k(_k), mp(mat) {};
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 {
// The bounding box must have non-zero width in each dimension, so pad the Y
// dimension a small amount.
output_box = aabb(point3(x0,k-0.0001,z0), point3(x1, k+0.0001, z1));
return true;
}
virtual double pdf_value(const point3& origin, const vec3& v) const override {
hit_record rec;
if (!this->hit(ray(origin, 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);
}
virtual vec3 random(const point3& origin) const override {
auto random_point = point3(random_double(x0,x1), k, random_double(z0,z1));
return random_point - origin;
}
public:
shared_ptr<material> mp;
double x0, x1, z0, z1, k;
};
class yz_rect : public hittable {
public:
yz_rect() {}
yz_rect(double _y0, double _y1, double _z0, double _z1, double _k,
shared_ptr<material> mat)
: y0(_y0), y1(_y1), z0(_z0), z1(_z1), k(_k), mp(mat) {};
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 {
// The bounding box must have non-zero width in each dimension, so pad the X
// dimension a small amount.
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 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.u = (x-x0)/(x1-x0);
rec.v = (y-y0)/(y1-y0);
rec.t = t;
auto outward_normal = vec3(0, 0, 1);
rec.set_face_normal(r, outward_normal);
rec.mat_ptr = mp;
rec.p = r.at(t);
return true;
}
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;
}
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