A class representing one triangular piece - a facet - in a polymesh topology. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2014 
Syntax
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Remarks
 Each facet is defined by indices of three vertices of the polymesh.