c3d-featurelines
Installation
SKILL.md
Civil 3D Feature Lines
Use this skill when working with feature lines - creating standalone/grading feature lines, managing elevations and geometry, accessing corridor feature lines, or exporting corridor feature lines to other object types.
Two Types of Feature Lines
Civil 3D has two distinct feature line types that share a name but differ fundamentally:
| Aspect | FeatureLine (Grading) |
CorridorFeatureLine (Corridor) |
|---|---|---|
| Base class | Feature : Entity (DBObject) |
Corridor sub-object (not a DBObject) |
| Persistence | Stored in drawing, has ObjectId | Computed on corridor rebuild |
| Creation | FeatureLine.Create() from polyline |
Automatic from assembly point codes |
| Visibility | Prospector > Sites > Feature Lines | Corridor > Baselines > Feature Lines |
| Editing | Direct point/elevation editing | Read-only (change assembly/corridor) |
| Namespace | Autodesk.Civil.DatabaseServices |
Autodesk.Civil.DatabaseServices |