MESH allows you to define a surface and then generate a 
set of polylines (a mesh) that approximates the surface 
to a user-specified level of accuracy. It allows you to
generate a polyline mesh approximation of a two-curve,
three-curve, or four-curve swept surface; a tabulated
cylinder; a surface of revolution; a sphere; or a ruled
surface.


Create the polyline mesh by choosing from the following
options:

2 CURVE - to create a polyline mesh defined by a selected
generator curve and a director curve. The mesh 
approximates the swept surface that is formed by moving
(sweeping) the generator curve along the director curve.

3 CURVE - to create a polyline mesh defined by either
two generator curves and a director curve, or by one
generator curve and two director curves. The mesh
approximates the blending of the two, two-curve surfaces.

4 CURVE - to create a polyline mesh defined by two 
generator curves and two director curves. The mesh
approximates the blending of the four, two-curve surfaces.

TAB CYL - to create a polyline mesh approximation of the
surface defined by sweeping a generator curve along an 
axis vector (the director) of a specified length.

REVOLUT - to create a polyline mesh that approximates the
surface formed by rotating a generator curve about an axis
by a specified angular distance.

SPHERE - to create a polyline mesh that approximates a
sphere. Create a sphere in either of the following ways:

a) By specifying the center and radius of the sphere, as
   well as the number of latitude and longitude lines.

b) By specifying the center and diameter of the sphere, as
   well as the number of latitude and longitude lines.

RULED - to create a polyline mesh that approximates the
surface formed by simultaneously moving a line (generator)
along two director curves.
