Sets the ElementId of the cut face background pattern override. The fill pattern must be a drafting pattern. A value of InvalidElementId means no override is set. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 22.0.0.0 (22.1.0.0) 
  Since:  2019 
Syntax
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Parameters
- fillPatternId
-  Type:  Autodesk.Revit.DB ElementId  
 Value of the cut face background fill pattern override.
Return Value
Reference to the changed object.Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was null |