8.2.4.6} Truncated Right Angle Cone. Code: TRC

      A TRC can have any orientation in space.
      It is bounded by a conical surface and by two circular plane faces
      perpendicular to the axis of the cone.
      Each TRC is defined by 8 numbers:
      V_x, V_y, V_z, (coordinates of the centre of the major circular
      base), H_x, H_y, H_z (components of a vector corresponding to the
      TRC height, directed from the major to the minor base), R1 (radius
      of the major base), R2 (radius of the minor base)
      A TRC definition extends over 2 lines in default fixed format, or over
      3 lines in high-accuracy body fixed format.

      Example in default fixed format:
 *...+....1....+....2....+....3....+....4....+....5....+....6....+....7..
   TRC  102       0.0       0.0    -130.0       0.0       0.0    1000.0
                 600.     150.0
 * (a truncated cone 1000 cm long parallel to the z axis, with the
 * larger circular base 600 cm in radius located at z = -130 and the
 * smaller base 150 cm in radius located at z = 870)

      The same example in high-accuracy body fixed format:
 *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+.
   TRC  102                   0.0                   0.0                -130.0
                              0.0                   0.0                1000.0
                             600.                 150.0

      The same, in free format:
 TRC  NewCone  0.0  0.0  -130.0  0.0  0.0  1000.0  600.  150.0

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