Introduction to 3D Design - Autodesk AutoCAD 2013 Practical 3D Drafting and Design - page 28

or over a grip and on the grip menu choose to move the vertex, add one, or remove
that vertex. This last process is known as multifunctional grip.
Note
Since AutoCAD 2012, the JOIN command is also a great tool for the creation of
complex splines. We may have a contiguous and non-planar sequence of lines,
arcs, elliptical arcs, splines that the result is a single spline.
With the HELIX command we can create 2D or 3D helixes or spirals. By default,
the command prompts for the center point of the base, base radius, top radius, and
height. As options, we have the position of the axis endpoint, the number of turns,
the height of one complete turn, and the twist (if the helix is drawn in the clockwise
or the counterclockwise direction). To edit a helix object, we can use grips or the
PROPERTIES command.