 2PBOX                                                      Menu: (POLYG) PRISM
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 Creates a rectangular solid prism or a (2D) rectangular polygon, given base
 plane, two opposite corners and height.

         1. * (CHAR) plane of base rectangle (x-xy,y-yz,z-zx)<x>
         2. * (POINT) first point
         3. * (POINT) opposite point
      for option `x':
         4. * (NUM) height of prism
      for options `y' or `z':
         4. * (NUM) width of prism
      for all options:
         5. * (Y/N) positive prism? <y>

 Description:
 This command creates a rectangular (2D) polygon or a rectangular solid prism
 based on that polygon.




 Choose a plane for the base polygon: x  xy plane (the default), y  yz plane or
 z  xz plane, and pick two points representing diagonally opposite corners of
 the base. Specify the height (or width) of the prism (you may enter 0 for a 2D
 polygon), enter `y' for a positive prism (the default), or `n' for a negative
 one.

         Example: \2pbox x 0 0 0 4 4 0 3 y

 Result: A 4 by 4 by 3 rectangular prism is created with its lower-left corner
 at the point 0 0 0.
