MESH allows you to generate a set of lines (a mesh) that
approximates the surface to a user-specified level of
accuracy. It can be 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 mesh by choosing from the following options:

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

3 CURVE - to create a line mesh that is 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 line mesh that is 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 line mesh that approximates the
surface that is defined by sweeping a generator curve 
along an axis vector (the director) of a specified length.

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

SPHERE - to create a line mesh that approximates a sphere.
You can create a sphere in any of the following ways:

- by specifying the center and radius of the sphere, as
well as the number of latitude and longitude lines.

- by specifying the center and diameter of the sphere, as
well as the number of latitude and longitude lines.

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