vb_surf_element_get_normal_vector

 get normal vector of surf_element
 [USAGE]
    [normal_vector] = vb_surf_element_get_normal_vector(<obj>);
 [IN]
    obj : surf_element object
 [OUT]
    normal_vector : normal vector of surf_element

 Author: rhayashi
 Created: 2007-07-17

 Copyright (C) 2011, ATR All Rights Reserved.
 License : New BSD License(see VBMEG_LICENSE.txt)

0001 function [normal_vector] = vb_surf_element_get_normal_vector(obj)
0002 % get normal vector of surf_element
0003 % [USAGE]
0004 %    [normal_vector] = vb_surf_element_get_normal_vector(<obj>);
0005 % [IN]
0006 %    obj : surf_element object
0007 % [OUT]
0008 %    normal_vector : normal vector of surf_element
0009 %
0010 % Author: rhayashi
0011 % Created: 2007-07-17
0012 %
0013 % Copyright (C) 2011, ATR All Rights Reserved.
0014 % License : New BSD License(see VBMEG_LICENSE.txt)
0015 
0016 %
0017 % --- Previous check
0018 %
0019 if ~exist('obj', 'var'), error('obj is a required parameter.'); end
0020 
0021 %
0022 % --- Main Procedure
0023 %
0024 normal_vector = obj.xx;