use crate::math::{Point, Real, Vector};
use na::Unit;
#[inline]
#[cfg(feature = "dim2")]
pub fn ccw_face_normal(pts: [&Point<Real>; 2]) -> Option<Unit<Vector<Real>>> {
let ab = pts[1] - pts[0];
let res = Vector::new(ab[1], -ab[0]);
Unit::try_new(res, crate::math::DEFAULT_EPSILON)
}
#[inline]
#[cfg(feature = "dim3")]
pub fn ccw_face_normal(pts: [&Point<Real>; 3]) -> Option<Unit<Vector<Real>>> {
let ab = pts[1] - pts[0];
let ac = pts[2] - pts[0];
let res = ab.cross(&ac);
Unit::try_new(res, crate::math::DEFAULT_EPSILON)
}