bool Sphere::intersectsWithRay(Ray* ray, float* t) {
coord_t l_vect;
l_vect = subtract_coord_nopt(this->getCenter(), ray->getStartPoint());
float s = scalar_mult_vect_nopt(ray->getDirection(), l_vect);
float s_square = s*s;
float r_square = this->getRadius()*this->getRadius();
float l_square = scalar_mult_vect_nopt(l_vect, l_vect);
if ((s<0.0)&&(l_square>r_square)) return false;
float m_square = l_square - s_square;
if (m_square > r_square) return false;
float q = sqrt(r_square - m_square);
if (l_square>r_square) {
*t = (s-q);
return true;
}
else {
*t = (s+q);
return true;
}
}
rgb_value_t Sphere::shade_reflective(Ray* ray, Light* light, std::list<Sphere*>* sphereList, coord_t* point, int ref_cnt){
rgb_value_t darkness, ret_val;
darkness.r = 0;
darkness.g = 0;
darkness.b = 0;
coord_t norm_vect;
norm_vect = subtract_coord(point, ¢er);
norm_vect = normalize_vect(&norm_vect);
coord_t reflect_dir;
reflect_dir = subtract_coord_nopt(ray->getDirection(), mult_vect(&norm_vect, 2.0*(scalar_mult_vect_nopt(norm_vect, ray->getDirection()))));
if (ref_cnt > 0) {
Ray* reflectedRay = new Ray(point, &reflect_dir);
Sphere* pointer_dummy=this;
ret_val = reflectedRay->raytrace(sphereList, light, &pointer_dummy, ref_cnt-1);
delete reflectedRay;
return ret_val;
} else {
return darkness;
}
}
rgb_value_t Sphere::shade_non_reflective(Ray* ray, Light* light, std::list<Sphere*>* sphereList, coord_t* point){
rgb_value_t darkness;
darkness.r = 0;
darkness.g = 0;
darkness.b = 0;
coord_t dist_ray_vect;
float dist_ray_abs;
coord_t dist_light_vect;
float dist_light_abs;
dist_ray_vect = subtract_coord_nopt(this->getCenter(), ray->getStartPoint());
dist_ray_abs = vect_abs(&dist_ray_vect);
dist_light_vect = subtract_coord_nopt(this->getCenter(), light->getPosition());
dist_light_abs = vect_abs(&dist_light_vect);
bool light_inside = (dist_light_abs<=this->getRadius()) ? true : false;
bool ray_inside = (dist_ray_abs<=this->getRadius()) ? true : false;
if (light_inside!=ray_inside) {
return darkness;
}
if (!light_inside) {
//std::cout << "outside" << std::endl;
coord_t norm_vect;
norm_vect = subtract_coord(point, ¢er);
coord_t light_point_vect;
light_point_vect = subtract_coord_nopt(*point, light->getPosition());
float light_point_abs = vect_abs(&light_point_vect);
float parallelism = scalar_mult_vect(&norm_vect, &light_point_vect);
if (parallelism>0.0) return darkness;
coord_t light_pos = light->getPosition();
Ray* lightRay = new Ray(&light_pos, &light_point_vect);
float buffer;
for (std::list<Sphere*>::iterator p = (*sphereList).begin(); p!=(*sphereList).end(); p++) {
if ((*p)!=this) {
if ((*p)->intersectsWithRay(lightRay, &buffer)) {
if (buffer<light_point_abs) {
delete lightRay;
return darkness;
}
}
}
}
delete lightRay;
norm_vect = normalize_vect(&norm_vect);
light_point_vect = div_vect(&light_point_vect, -light_point_abs);
parallelism = scalar_mult_vect(&norm_vect, &light_point_vect);
rgb_value_t rgb_ret = this->getColour();
rgb_ret.r *= parallelism;
rgb_ret.g *= parallelism;
rgb_ret.b *= parallelism;
return rgb_ret;
} else {
//std::cout << "inside" << std::endl;
coord_t norm_vect;
norm_vect = subtract_coord(point, ¢er);
coord_t light_point_vect;
light_point_vect = subtract_coord_nopt(*point, light->getPosition());
float light_point_abs = vect_abs(&light_point_vect);
coord_t light_pos = light->getPosition();
Ray* lightRay = new Ray(&light_pos, &light_point_vect);
float buffer;
for (std::list<Sphere*>::iterator p = (*sphereList).begin(); p!=(*sphereList).end(); p++) {
if ((*p)!=this) {
if ((*p)->intersectsWithRay(lightRay, &buffer)) {
if (buffer<light_point_abs) {
delete lightRay;
return darkness;
}
}
}
}
delete lightRay;
norm_vect = normalize_vect(&norm_vect);
light_point_vect = div_vect(&light_point_vect, light_point_abs);
float parallelism = scalar_mult_vect(&norm_vect, &light_point_vect);
rgb_value_t rgb_ret = this->getColour();
rgb_ret.r *= parallelism;
rgb_ret.g *= parallelism;
rgb_ret.b *= parallelism;
return rgb_ret;
}
}
