The index of the vertex in the Vertices array of the mesh, for indexed access. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Parameters
- idx
-  Type:  System Int32  
 Index of the vertex in the triangle: 0, 1 or 2.