Nevron surface chart data source

I have been looking at the above metioned chart and I am trying to figure out how their "FillData" method on the snippet below works.

private void FillData(NGridSurfaceSeries surface)
        {
            double y, x, z;
            int nCountX = surface.Data.GridSizeX;
            int nCountZ = surface.Data.GridSizeZ;

            const double dIntervalX = 30.0;
            const double dIntervalZ = 30.0;
            double dIncrementX = (dIntervalX / nCountX);
            double dIncrementZ = (dIntervalZ / nCountZ);

            z = -(dIntervalZ / 2);

            for(int j = 0; j < nCountZ; j++, z += dIncrementZ)
            {
                x = -(dIntervalX / 2);

                for(int i = 0; i < nCountX; i++, x += dIncrementX)
                {
                    y = (x * z / 64.0) - Math.Sin(z / 2.4) * Math.Cos(x / 2.4);
                    y = 10 * Math.Sqrt( Math.Abs(y) );

                    if(y <= 0)
                    {
                        y = 1 + Math.Cos(x / 2.4);
                    }

                    surface.Data.SetValue(i, j, y);
                }
            }
        }

The documentaion is extremely sparse, and I would like to pass list of value in place of "Y", but I do not know what the rest of the code is doing, if anybody here has worked with this please shoot.

Actually you need only the surface.Data.SetValue method, the rest of the code just generates some data. The Grid Surface data storage is like a 2 dimensional table – i and j are indices that specify a data point and y is the value of the data point. For example the following code fills some data in a 3x2 grid surface:

// first row
surface.Data.SetValue(0, 0, 7.53);
surface.Data.SetValue(1, 0, 6.19);
surface.Data.SetValue(2, 0, 9.78);

// second row
surface.Data.SetValue(0, 1, 5.35);
surface.Data.SetValue(1, 1, 4.71);
surface.Data.SetValue(2, 1, 8.85);

I hope this helps.