NPOLY                                                             Menu: PRISMS
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Creates a solid prism based on a regular polygon of a specified number of
sides or a 2D polygon.

        1.   (CHAR) plane of base polygon (x-xy,y-yz,z-zx) <x>
        2. * (NUM) number of sides (3  50)
        3. * (POINT) center of polygon
        4. * (NUM) radius of circumscribed circle of the polygon
     for option `x'
        5. *       height of prism
     for option `y' or `z'
        5. * (NUM) width of prism
        6. * (NUM) positive prism ? <y>

Description:
This command creates a 2D regular polygon of a specified number of sides or
a solid prism based on the polygon.
Specify one of the axial planes, (x  xy plane, the default, y  yz plane or z
xz plane). Define the number of sides of the base polygon and the center of
the polygon. Specify the radius of the circumscribed circle, and the height
(for option `x') or the width (for options `y' or `z'). You may enter `0' for
a 2D polygon.
Enter `y' for a positive solid or `n' for a negative one.
You are prompted to create additional prisms until another command is
selected.
        Example: \npoly x 5 3 3 0 4 6 y
        Result: A positive prism based on a pentagon (five sides) is created
                with the center of its base at 3 3 0, a radius of 4 units
                (meters or feet) (circumscribed circle), and a height of 6
                units.
