Remove the fixed direction from a segment. 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Parameters
- iSegment
 -  Type:  System Int32  
Index of the segment (0 to NumberOfSegments - 1). 
Remarks
 The segment's angle will be allowed to vary, with a range of 90 degrees. The segment must have at least two constraints. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | iSegment is not between 0 and NumberOfSegments. |