MOAB: Mesh Oriented datABase  (version 5.2.1)
LaplacianSmoother.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 /*!
00028   \file   LaplacianSmoother.cpp
00029   \brief
00030 
00031   The LaplacianSmoother Class is the concrete class
00032   that performs Laplacian Smoothing
00033 
00034   \author Thomas Leurent
00035   \date   2002-01-17
00036 */
00037 
00038 #include "LaplacianSmoother.hpp"
00039 #include "PatchData.hpp"
00040 #include "MsqVertex.hpp"
00041 
00042 namespace MBMesquite
00043 {
00044 
00045 std::string LaplacianSmoother::get_name() const
00046 {
00047     return "LaplacianSmoother";
00048 }
00049 
00050 LaplacianSmoother::~LaplacianSmoother() {}
00051 
00052 void LaplacianSmoother::optimize_vertex_positions( PatchData& pd, MsqError& err )
00053 {
00054     assert( pd.num_free_vertices() == 1 );
00055     const size_t center_vtx_index = 0;
00056 
00057     adjVtxList.clear();
00058     pd.get_adjacent_vertex_indices( center_vtx_index, adjVtxList, err );MSQ_ERRRTN( err );
00059 
00060     if( adjVtxList.empty() ) return;
00061 
00062     const MsqVertex* verts = pd.get_vertex_array( err );
00063     const size_t n         = adjVtxList.size();
00064 
00065     Vector3D new_pos = verts[adjVtxList[0]];
00066     for( size_t i = 1; i < n; ++i )
00067         new_pos += verts[adjVtxList[i]];
00068     new_pos *= 1.0 / n;
00069     pd.set_vertex_coordinates( new_pos, center_vtx_index, err );
00070     pd.snap_vertex_to_domain( center_vtx_index, err );MSQ_ERRRTN( err );
00071 }
00072 
00073 }  // namespace MBMesquite
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