MOAB: Mesh Oriented datABase  (version 5.3.1)
Vector3D.cpp
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00001 /* *****************************************************************
00002     MESQUITE -- The Mesh Quality Improvement Toolkit
00003 
00004     Copyright 2004 Sandia Corporation and Argonne National
00005     Laboratory.  Under the terms of Contract DE-AC04-94AL85000
00006     with Sandia Corporation, the U.S. Government retains certain
00007     rights in this software.
00008 
00009     This library is free software; you can redistribute it and/or
00010     modify it under the terms of the GNU Lesser General Public
00011     License as published by the Free Software Foundation; either
00012     version 2.1 of the License, or (at your option) any later version.
00013 
00014     This library is distributed in the hope that it will be useful,
00015     but WITHOUT ANY WARRANTY; without even the implied warranty of
00016     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00017     Lesser General Public License for more details.
00018 
00019     You should have received a copy of the GNU Lesser General Public License
00020     (lgpl.txt) along with this library; if not, write to the Free Software
00021     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00022 
00023     diachin2@llnl.gov, djmelan@sandia.gov, mbrewer@sandia.gov,
00024     pknupp@sandia.gov, tleurent@mcs.anl.gov, tmunson@mcs.anl.gov
00025 
00026   ***************************************************************** */
00027 #include "Vector3D.hpp"
00028 #include "MsqError.hpp"
00029 
00030 #include "moab/Util.hpp"
00031 
00032 #include <iostream>
00033 #include <cmath>
00034 
00035 #ifdef MSQ_HAVE_IEEEFP_H
00036 #include <ieeefp.h>
00037 #endif
00038 
00039 namespace MBMesquite
00040 {
00041 
00042 std::ostream& operator<<( std::ostream& s, const MBMesquite::Vector3D& v )
00043 {
00044     return s << v[0] << ' ' << v[1] << ' ' << v[2];
00045 }
00046 
00047 double Vector3D::interior_angle( const Vector3D& lhs, const Vector3D& rhs, MsqError& err )
00048 {
00049     double len1      = lhs.length();
00050     double len2      = rhs.length();
00051     double angle_cos = ( lhs % rhs ) / ( len1 * len2 );
00052     if( !moab::Util::is_finite( angle_cos ) )
00053     {
00054         MSQ_SETERR( err )( MsqError::INTERNAL_ERROR );
00055         return 0.0;
00056     }
00057 
00058     // Adjust the cosine if slightly out of range
00059     if( ( angle_cos > 1.0 ) && ( angle_cos < 1.0001 ) ) { angle_cos = 1.0; }
00060     else if( angle_cos < -1.0 && angle_cos > -1.0001 )
00061     {
00062         angle_cos = -1.0;
00063     }
00064 
00065     return std::acos( angle_cos );
00066 }
00067 
00068 }  // namespace MBMesquite
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