DblPivot:

Path: SC/Attitude

% Computes the unit normal for a double pivoted assembly. 
   The three pivot positions are given as p1, p2 and p3 all with respect to a 
   common reference plane. Positive is taken using the right hand rule
   going from point 1 to 2 to 3.

   Since version 1.
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   Form:
   n = DblPivot( p1, p2, p3 )
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   ------
   Inputs
   ------
   p1            (3,1) Pivot point 1
   p2            (3,1) Pivot point 2
   p3            (3,1) Pivot point 3

   -------
   Outputs
   -------
   n             (3,1) The normal

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