public static CylData CenterToThetaRadMidpoint(CylData data)
        {
            int    midCount = (int)Math.Round(data.Count / 2.0);
            var    minMax   = data.GetMinMaxR();
            var    midRData = (minMax.Item1 + minMax.Item2) / 2.0;
            double x1       = 0;

            for (int i = 1; i < midCount; i++)
            {
                if ((data[i - 1].R <midRData && data[i].R> midRData) ||
                    (data[i - 1].R > midRData && data[i].R < midRData))
                {
                    x1 = (data[i - 1].ThetaRad + data[i].ThetaRad) / 2.0;
                    break;
                }
            }
            double x2 = 0;

            for (int i = midCount; i < data.Count; i++)
            {
                if ((data[i - 1].R <midRData && data[i].R> midRData) ||
                    (data[i - 1].R > midRData && data[i].R < midRData))
                {
                    x2 = (data[i - 1].ThetaRad + data[i].ThetaRad) / 2.0;
                    break;
                }
            }
            double midThetaRad = (x1 + x2) / 2.0;
            var    transData   = new CylData(data.FileName);

            foreach (var pt in data)
            {
                transData.Add(new PointCyl(pt.R, pt.ThetaRad - midThetaRad, pt.Z));
            }
            return(transData);
        }