extern crate cgmath;
use cgmath::*;
#[test]
fn test_intersection() {
let sphere = Sphere {center: Point3::new(0f64,0f64,0f64), radius: 1f64};
let r0 = Ray::new(Point3::new(0f64, 0f64, 5f64), Vector3::new(0f64, 0f64, -5f64).normalize());
let r1 = Ray::new(Point3::new(1f64.cos(), 0f64, 5f64), Vector3::new(0f64, 0f64, -5f64).normalize());
let r2 = Ray::new(Point3::new(1f64, 0f64, 5f64), Vector3::new(0f64, 0f64, -5f64).normalize());
let r3 = Ray::new(Point3::new(2f64, 0f64, 5f64), Vector3::new(0f64, 0f64, -5f64).normalize());
assert_eq!((sphere,r0).intersection(), Some(Point3::new(0f64, 0f64, 1f64)));
assert!((sphere,r1).intersection().unwrap().approx_eq( &Point3::new(1f64.cos(), 0f64, 1f64.sin()) ));
assert_eq!((sphere,r2).intersection(), Some(Point3::new(1f64, 0f64, 0f64)));
assert_eq!((sphere,r3).intersection(), None);
}
#[test]
fn test_bound() {
let point = Point3::new(1f32, 2.0, 3.0);
let sphere = Sphere { center: point, radius: 1.0 };
let normal = vec3(0f32, 0.0, 1.0);
assert_eq!(sphere.relate_plane(
&Plane::from_point_normal(point, normal)
), Relation::Cross);
assert_eq!(sphere.relate_plane(
&Plane::from_point_normal(point.add_v(&normal.mul_s(-3.0)), normal),
), Relation::In);
assert_eq!(sphere.relate_plane(
&Plane::from_point_normal(point.add_v(&normal.mul_s(3.0)), normal),
), Relation::Out);
}