BezierCurves.BezierCurve3DEditor.AddKeyPointAt C# (CSharp) Method

        private static BezierPoint3D AddKeyPointAt(BezierCurve3D curve, int index)
        {
            BezierPoint3D newPoint = new GameObject("Point " + curve.KeyPointsCount, typeof(BezierPoint3D)).GetComponent<BezierPoint3D>();
            newPoint.transform.parent = curve.transform;
            newPoint.transform.localRotation = Quaternion.identity;
            newPoint.Curve = curve;

            if (curve.KeyPointsCount == 0 || curve.KeyPointsCount == 1)
            {
                newPoint.LocalPosition = Vector3.zero;
            }
            else
            {
                if (index == 0)
                {
                    newPoint.Position = (curve.KeyPoints[0].Position - curve.KeyPoints[1].Position).normalized + curve.KeyPoints[0].Position;
                }
                else if (index == curve.KeyPointsCount)
                {
                    newPoint.Position = (curve.KeyPoints[index - 1].Position - curve.KeyPoints[index - 2].Position).normalized + curve.KeyPoints[index - 1].Position;
                }
                else
                {
                    newPoint.Position = BezierCurve3D.GetPointOnCubicCurve(0.5f, curve.KeyPoints[index - 1], curve.KeyPoints[index]);
                }
            }

            Undo.IncrementCurrentGroup();
            Undo.RegisterCreatedObjectUndo(newPoint.gameObject, "Create Point");
            Undo.RegisterCompleteObjectUndo(curve, "Save Curve");

            curve.KeyPoints.Insert(index, newPoint);
            RenamePoints(curve);

            //Undo.RegisterCompleteObjectUndo(curve, "Save Curve");

            return newPoint;
        }