For a multiplanar rebar, the depth of the instance. 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 18.0.0.0 (18.2.0.0) 
  Since:  2009 
Syntax
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Remarks
 Applicable only when an instance of a RebarShape with a RebarShapeMultiplanarDefinition. 
 Exceptions
| Exception | Condition | 
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| Autodesk.Revit.Exceptions ArgumentOutOfRangeException | When setting this property: multiplanarDepth must be positive. | 
| Autodesk.Revit.Exceptions DisabledDisciplineException | When setting this property: None of the following disciplines is enabled: Structural. | 
| Autodesk.Revit.Exceptions InvalidOperationException | This Rebar is not an instance of a multiplanar shape. -or- This method applies only to shape driven rebar. |