Opens a new connected face set. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2015 
Syntax
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Parameters
- isSolid
-  Type:  System Boolean  
 Whether the face set, which is being open, should be build as a solid or as a void.
Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions InvalidOperationException | A face set is open and a geometry cannot be build until it is closed. |