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