tangentAt method

@override Vector3 tangentAt(double t)

The unit tangent at natural parameter t (clamped to 0..1).

Implementation

@override
Vector3 tangentAt(double t) {
  final (segment, _) = _segmentOf(t, _points.length - 1);
  final direction = _points[segment + 1] - _points[segment];
  if (direction.length2 < 1e-12) return Vector3(1.0, 0.0, 0.0);
  return direction.normalized();
}