About 3D polylines

Solved: How to grade a 3D polyline at a constant slope - Autodesk Community - Civil 3D

Drawing in the Scene

Quick Way to Join Using PEDIT

3D Polyline

Beyond Civil3D: Civil 3D Polyline Tools

Quick Way to Join Using PEDIT

Splines, Polylines and 3D Polylines

3D Polyline

CAD Forum - How to convert 3D polylines to 3D surfaces?

Sweet Home 3D 5.0 - Sweet Home 3D Blog

Free Lisps App to mark Z value at each Vertex of 3D Poly

A minor question on AutoCAD import - #23 by gsharp - SketchUp - SketchUp Community

line - Creating 3D polyline just below another polyline using ArcGIS Desktop? - Geographic Information Systems Stack Exchange

Display 3D Base(vector) polygons and polylines in the 3D View in Surfer – Golden Software Support