///////////////////////////////////////////////////////////////////////////////
//      Title     : look_at_pose
//      Project   : look_at_pose
//      Created   : 5/31/2017
//      Author    : Andy Zelenak
//      Platforms : Ubuntu 64-bit
//      Copyright : Copyright© The University of Texas at Austin, 2014-2017. All rights reserved.
//                 
//	    All files within this directory are subject to the following, unless an alternative
//	    license is explicitly included within the text of each file.
//
//	    This software and documentation constitute an unpublished work
//          and contain valuable trade secrets and proprietary information
//          belonging to the University. None of the foregoing material may be
//          copied or duplicated or disclosed without the express, written
//          permission of the University. THE UNIVERSITY EXPRESSLY DISCLAIMS ANY
//          AND ALL WARRANTIES CONCERNING THIS SOFTWARE AND DOCUMENTATION,
//          INCLUDING ANY WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
//          PARTICULAR PURPOSE, AND WARRANTIES OF PERFORMANCE, AND ANY WARRANTY
//          THAT MIGHT OTHERWISE ARISE FROM COURSE OF DEALING OR USAGE OF TRADE.
//          NO WARRANTY IS EITHER EXPRESS OR IMPLIED WITH RESPECT TO THE USE OF
//          THE SOFTWARE OR DOCUMENTATION. Under no circumstances shall the
//          University be liable for incidental, special, indirect, direct or
//          consequential damages or loss of profits, interruption of business,
//          or related expenses which may arise from use of software or documentation,
//          including but not limited to those resulting from defects in software
//          and/or documentation, or loss or inaccuracy of data of any kind.
//
//      Purpose : Look at an arbitrary pose while maintaining an upright camera.
//
///////////////////////////////////////////////////////////////////////////////
