private void DuplicatePointAt(int index)
{
BezierPoint point = spline.DuplicatePointAt(index);
Undo.IncrementCurrentGroup();
Undo.RegisterCreatedObjectUndo(point.gameObject, "Duplicate Point");
Undo.RegisterCompleteObjectUndo(point.transform.parent, "Duplicate Point");
Selection.activeTransform = point.transform;
SceneView.RepaintAll();
}