The following image demonstrates a chart with the SemiRectanglePie3DModel applied.

For more information, see Series and Marker Models.
System.Object
System.Windows.Threading.DispatcherObject
System.Windows.DependencyObject
DevExpress.Xpf.Charts.ModelBase
Pie3DModel
PredefinedPie3DModel
SemiRectanglePie3DModel