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Gets the IThreeDFormat object for the chart element.
Use the returned IThreeDFormat object to access and modify the 3-D formatting properties of the specified chart element, such as rotation, perspective, and visibility.
IThreeDFormat ThreeD { get; }
ReadOnly Property ThreeD As IThreeDFormat
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered, 20, 20, 360, 220).Chart;
IChartFormat format = chart.ChartArea.Format;
IThreeDFormat threeD = format.ThreeD;
threeD.RotationX = 20;