The Chart3DContourLevel object controls the behavior of the distribution levels used to create contour levels and zones for a chart. One Chart3DContourLevel object is defined for each chart group.

The NumLevels property of the Chart3DContour object specifies the number of distribution levels to use in the chart. Any number between 2 and 100 is valid. If two are specified, no contour levels are drawn, and the entire chart is displayed as one zone.

By default, distribution levels are evenly spaced. To define distribution levels and spacing, use the Add method of the Chart3DContourLevel to create them. For example, the following code defines distribution levels at 1000, 2500 and 4200:

To write code in Visual Basic

With C1Chart3D1.ChartGroups(0).Contour.Levels
  .Add( 1000)
  .Add( 2500)
  .Add( 4200)
End With

To write code in C#

Chart3DContourLevelsCollection levs;
levs = C1Chart3D1.ChartGroups[0].Contour.Levels;
levs.Add(1000);
levs.Add(2500);
levs.Add(4200);

To remove a distribution level, use the Remove method:

To write code in Visual Basic

C1Chart3D1.ChartGroups(1).Contour.Levels.Remove( 1000)

To write code in C#

C1Chart3D1.ChartGroups[1].Contour.Levels.Remove( 1000);

At any time, revert to evenly spaced distribution levels by setting the AutoDistribution property to True. If this is done, the number of distribution levels in the chart will not change.