Ray PerspectiveCamera::generateRay(const Point2d &sample) const
{
Point3d ori(0);
Ray ray(ori, normalize(Vector3d(rasterToCamera_(Point3d(sample.x_, sample.y_, 0)))));
if (focal_distance_ > 0) {
static RandomNumberGenerator rng;
Point2d tmp = Point2d(rng.Uniform2(), rng.Uniform2());
ori = Point3d(tmp.x_, tmp.y_, 0) * radius_;
double z = -(focal_distance_ / ray.direction().z_);
Point3d hit(ray.direction() * z);
ray.setDirection(normalize(hit - ori));
}
ray.setOrigin(cameraToWorld_(ori));
return std::move(ray);
}
