FFEccHexahedronGeometry:

Path: FormationFlying/Guidance

% Geometric goals for a hexahedron
 Compute the geometric goals for a formation that achieves a hexahedron shape
 at a given true anomaly in an eccentric reference orbit. The hexahedral
 configuration has 5 points and forms two stacked tetrahedra -- one pointing
 up, the other pointing down.

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   Form:
   g = FFEccHexahedronGeometry( nu, d, eul )
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   Inputs
   ------
   nu          (1)  True anomaly where hexahedron occurs
   d           (1)  Length of each side
   eul        (3,1) Euler angles defining the orientation
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   Outputs
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   g           (.)  Geometric goals data structure
   
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