8.2.4.15} Pyramid parallel to a coordinate axis. Code: PYX, PYY, PYZ

      A PYX (PYY, PYZ)  is a pyramid  parallel to the x (y, z) axis.
      It Can be full or truncated
      Each  PYX (PYY, PYZ)  is defined by 7 parameters:
      V_x, V_y, V_z, (coordinates of the centre of the major base)
      L_y, L_z (res.p L_z, L_x or L_x, L_y) half-lengths of the sides
       of the major base
      H : height of the pyramid. The sign gives the direction from major
          to minor basis
      R : ratio between the sides of the minor base and the sides of the
          major base. If R=0.0, the pyramid is not truncated.
          R>=1. is not accepted
      Example
      PYZ body3        0.0   0.5   -10.0   +20.0  +40.0  50.0 0.8
      Is a truncated pyramid with  major base centered at
      0.0, 0.5,-10.0 and  extending from x=-20.0 to x=+20, and from
      y=-39.5 to y=40.5. Its axis is along z, its height is 50 cm,
      the minor basis extends from -16.0 to +16.0 in x and from
      -31.5 to 32.5 in y

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