BezierCurves.BezierCurve3D.AddKeyPointAt C# (CSharp) Method

        public BezierPoint3D AddKeyPointAt(int index)
        {
            BezierPoint3D newPoint = new GameObject("Point " + this.KeyPoints.Count, typeof(BezierPoint3D)).GetComponent<BezierPoint3D>();
            newPoint.Curve = this;
            newPoint.transform.parent = this.transform;
            newPoint.transform.localRotation = Quaternion.identity;

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

            this.KeyPoints.Insert(index, newPoint);

            return newPoint;
        }