Returns the second partial derivatives of the face at the specified point. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 16.0.0.0 (16.0.0.0) 
  Since:  2016 
Syntax
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Parameters
- point
-  Type:  Autodesk.Revit.DB UV  
 The parameters to be evaluated, in natural parameterization of the face.
Return Value
The second partial derivatives of the face at the specified point.Remarks
 It does not take the bounding edge loops into account.