extern crate nalgebra as na;
use na::allocator::Allocator;
use na::dimension::Dim;
use na::{DefaultAllocator, OVector, RealField, Unit, Vector2, Vector3};
fn reflect_wrt_hyperplane_with_dimensional_genericity<T: RealField, D: Dim>(
plane_normal: &Unit<OVector<T, D>>,
vector: &OVector<T, D>,
) -> OVector<T, D>
where
T: RealField,
D: Dim,
DefaultAllocator: Allocator<T, D>,
{
let n = plane_normal.as_ref(); vector - n * (n.dot(vector) * na::convert(2.0))
}
fn reflect_wrt_hyperplane2<T>(plane_normal: &Unit<Vector2<T>>, vector: &Vector2<T>) -> Vector2<T>
where
T: RealField,
{
let n = plane_normal.as_ref(); vector - n * (n.dot(vector) * na::convert(2.0))
}
fn reflect_wrt_hyperplane3<T>(plane_normal: &Unit<Vector3<T>>, vector: &Vector3<T>) -> Vector3<T>
where
T: RealField,
{
let n = plane_normal.as_ref(); vector - n * (n.dot(vector) * na::convert(2.0))
}
fn main() {
let plane2 = Vector2::y_axis(); let plane3 = Vector3::y_axis();
let v2 = Vector2::new(1.0, 2.0); let v3 = Vector3::new(1.0, 2.0, 3.0);
assert_eq!(
reflect_wrt_hyperplane_with_dimensional_genericity(&plane2, &v2).y,
-2.0
);
assert_eq!(
reflect_wrt_hyperplane_with_dimensional_genericity(&plane3, &v3).y,
-2.0
);
assert_eq!(reflect_wrt_hyperplane2(&plane2, &v2).y, -2.0);
assert_eq!(reflect_wrt_hyperplane3(&plane3, &v3).y, -2.0);
}