public NumberSequence(float n0, float n1)
        {
            NumberSequenceKeypoint a = new NumberSequenceKeypoint(0, n0);
            NumberSequenceKeypoint b = new NumberSequenceKeypoint(1, n1);

            Keypoints = new NumberSequenceKeypoint[2] {
                a, b
            };
        }
        public NumberSequence(Attribute attr)
        {
            int numKeys   = attr.ReadInt();
            var keypoints = new NumberSequenceKeypoint[numKeys];

            for (int i = 0; i < numKeys; i++)
            {
                keypoints[i] = new NumberSequenceKeypoint(attr);
            }

            Keypoints = keypoints;
        }