FeatureLine.md

FeatureLine Class

Overview

The FeatureLine class represents a 3D polyline used for grading and corridor design in Civil3D.

Namespace

Autodesk.Civil.DatabaseServices

Inheritance Hierarchy

System.Object
  └─ RXObject
      └─ DBObject
          └─ Entity
              └─ Feature
                  └─ FeatureLine

Key Properties

Property	Type	Description
Name	string	Gets/sets the feature line name
Length2D	double	Gets the 2D (horizontal) length
Length3D	double	Gets the 3D (slope) length
MaximumElevation	double	Gets the maximum elevation
MinimumElevation	double	Gets the minimum elevation

Key Methods

Method	Return Type	Description
GetPoints(FeatureLinePointType)	Point3dCollection	Gets points along the feature line
ElevationAtPoint(Point3d)	double	Gets elevation at a point

Code Examples

Example 1: Accessing Feature Lines

using (Transaction tr = civilDoc.Database.TransactionManager.StartTransaction())
{
    ObjectIdCollection featureLineIds = civilDoc.GetFeatureLineIds();
    
    foreach (ObjectId featureLineId in featureLineIds)
    {
        FeatureLine featureLine = tr.GetObject(featureLineId, OpenMode.ForRead) as FeatureLine;
        
        ed.WriteMessage($"\nFeature Line: {featureLine.Name}");
        ed.WriteMessage($"\n  2D Length: {featureLine.Length2D:F2}");
        ed.WriteMessage($"\n  3D Length: {featureLine.Length3D:F2}");
        ed.WriteMessage($"\n  Min Elevation: {featureLine.MinimumElevation:F2}");
        ed.WriteMessage($"\n  Max Elevation: {featureLine.MaximumElevation:F2}");
    }
    
    tr.Commit();
}

Related Objects

• Grading - Uses feature lines
• Corridor - Can extract feature lines
• CivilDocument - Container for feature lines

References

• Autodesk Official Documentation