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   Determine cross-sectional area from CAD model. This routine assumes that
   the first body is the core and the next n bodies, if any, are rotated by
   the corresponding body angle. 
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   Form:
   area = CrossSection( g, bodyAngle, viewV, plot )
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   ------
   Inputs
   ------
   g                 (:)  CAD model struct
   bodyAngle       (n,1)  Body angles, if applicable*
   viewV           (3,1)  Vector viewpoint*
   plot              (1)  Plot flag*
                             * Optional
   -------
   Outputs
   -------
   area              (1)  Cross-sectional area of spacecraft

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