This command adds vertices to the selected polylines at the
specified interval. These points are interpolated between existing
points in the polyline. This command is the opposite of Reduce
Polyline Vertices.
Select polylines to densify.
Select objects: select polylines
Point interval <10.0>: press Enter
Testing Entity> 1
Added 17 points to 1 polyline.
Pulldown Menu Location: Edit > Polyline Utilities
Keyboard Command: densepl
Prerequisite: A polyline