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   Draw a spacecraft in a plain 3D box.

   To initialize:

   tag = DrawSCPlanPlugIn( 'initialize', g, hFig, position )

   g        is the spacecraft CAD data structure. 
   hFig     is the handle to the figure window
   position is an array [left bottom width height] which gives the position
            of the plugin in the window

   If hFig is not entered it will create a new window. You need to save tag
   for subsequent calls.

   To pass new information to the plugin use

   DrawSCPlanPlugIn( 'update', tag, g )

   To erase

   DrawSCPlanPlugIn( 'erase', tag )

   To move components away from the center

   DrawSCPlanPlugIn( 'scale', tag, scaleFactor )

   To redraw

   DrawSCPlanPlugIn( 'draw', tag )

   To close the display type

   DrawSCPlanPlugIn( 'quit', tag )

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   Form:
   DrawSCPlanPlugIn( action, modifier, hFig, position )
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   ------
   Inputs
   ------
   action      (1,:)  Action
   modifier    (1,:)  Modifier to the action
   hFig        (1,1)  Handle to the figure or if 'update' is jD
   position    (1,4)  [left bottom width height]

   -------
   Outputs
   -------
   tag         (1,:)  The tag that identifies the display   

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