internal static Measurement <ErrorVector3D> ubitrackToUnity(SimpleErrorPosition3D ubitrackPose)
        {
            Vector3 trans = new Vector3((float)ubitrackPose.x, (float)ubitrackPose.y, (float)ubitrackPose.z);

            //Quaternion rot = new Quaternion((float)ubitrackPose.rx, (float)ubitrackPose.ry, (float)ubitrackPose.rz, (float)ubitrackPose.rw);

            trans = trans * UbiToUnityScaleFactor;

            ErrorVector3D data = new ErrorVector3D();

            coordsysemChange(trans, ref data.position);
            doubleArrayClass da = doubleArrayClass.frompointer(ubitrackPose.covariance);

            //for(int i=0;i<16;i++){
            for (int row = 0; row < 3; row++)
            {
                for (int col = 0; col < 3; col++)
                {
                    data.covariance[row, col] = (float)da.getitem(row * 3 + col);
                }
            }
            //coordsysemChange(rot, ref data.rot);
            //ubitrackCovarianceToFloatArray(ubitrackPose, ref data.covariance);

            /*  TODO: Define ubitrackCovarianceToFloatArray()
             *  with SimpleErrorPosition3D covariance type
             */


            return(new Measurement <ErrorVector3D>(data, ubitrackPose.timestamp));
        }
        public static void ubitrack3x4MatrixToFloatArray(SimpleMatrix3x3 ubiMatrix, ref float[] matrix)
        {
            doubleArrayClass dac = doubleArrayClass.frompointer(ubiMatrix.values);

            for (int i = 0; i < 9; i++)
            {
                matrix[i] = (float)dac.getitem(i);
            }
        }
        public static void ubitrack4x4MatrixToMatrix(SimpleMatrix4x4 ubiMatrix, ref Matrix4x4 matrix)
        {
            doubleArrayClass da = doubleArrayClass.frompointer(ubiMatrix.values);

            //for(int i=0;i<16;i++){
            for (int row = 0; row < 4; row++)
            {
                for (int col = 0; col < 4; col++)
                {
                    matrix[row, col] = (float)da.getitem(row * 4 + col);
                }
            }
        }