A choice of two reference points for one end of a constraint driving the length of a RebarShapeSegment. 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2012 
  Since:  2012 
Syntax
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Members
| Member name | Description | 
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| Straight | Refers to the end of the straight part of the segment: the point where the bend begins. | 
| Exterior | Refers to the farthest point on the arc of the bend. Assuming the bend is 90 degrees or more, an Exterior constraint will be longer than a Straight constraint by an amount equal to the bend radius. | 
Remarks
 The RebarShapeSegmentEndReferenceType of a constraint is meaningful only when the bend is  right  or  obtuse  . If the bend is  acute  , the reference type is ignored.