This command allows you to convert Autodesk Civil3D or Land
Desktop custom surface objects into standard AutoCAD entities. For
example, this command will convert AECC_CONTOUR objects into
polylines with elevation. The conversion is done on the currently
opened drawing. Besides converting the drawing entities, the
routine checks for triangulation surface definitions within the
drawing and prompts whether to save these surfaces to Carlson .TIN
files. The conversion routine was developed in cooperation with the
Open Design Alliance (ODA) and does not use object enablers from
Autodesk.
If you have Civil 3D, another way to make a drawing with
standard AutoCAD entities is to use the aectoacad command in Civil
3D which converts the custom objects into standard
entities.
Pulldown Menu Location: Surface >>
Import/Export
Keyboard Command: c3d_tin
Prerequisite: AEC surface objects to convert