Autodesk AUTOCAD 2006, Command Reference Manual, Page: 875 / 1490

3D polyline after curve-fitting
original 3D polyline
Decurve
Removes extra vertices inserted by a fit or spline curve and straightens all
segments of the polyline. Retains tangent information assigned to the polyline
vertices for use in subsequent fit curve requests. If you edit a spline-fit polyline
with a command such as BREAK or TRIM, you cannot use the Decurve option.
Undo
Reverses operations as far back as the beginning of the PEDIT session.
3D Polygon Mesh Selection
If you select a polygon mesh, the following prompt is displayed:
Enter an option [Edit vertex/Smooth surface/Desmooth/Mclose/Nclose/Undo]:
Enter an option or press ENTER to end the command
Mclose and Nclose are replaced by Mopen and Nopen if the polygon mesh is
currently closed in the M or N direction.
Edit Vertex
Edits individual vertices of a polygon mesh that can be seen as a rectangular
M by N array, where M and N are the dimensions specified in 3DMESH. The
SURFTAB1 and SURFTAB2 system variables store M and N values for RULESURF,
TABSURF, REVSURF, and EDGESURF.
Enter an option [Next/Previous/Left/Right/Up/Down/Move/REgen/eXit <current>:
Enter an option or press ENTER
Pressing ENTER accepts the current default, which is either Next or Previous.
Paste Special Dialog Box | 851