MOAB: Mesh Oriented datABase  (version 5.4.0)
ExtractShell.h
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00001 #ifndef __smoab_ExtractShell_h
00002 #define __smoab_ExtractShell_h
00003 
00004 #include "SimpleMoab.h"
00005 #include "detail/UsageTable.h"
00006 
00007 #include <algorithm>
00008 
00009 namespace smoab
00010 {
00011 
00012 class ExtractShell
00013 {
00014     const smoab::Interface& Interface;
00015     smoab::CellSets VCells;
00016 
00017   public:
00018     ExtractShell( const smoab::CellSets volCells, const smoab::Interface& interface )
00019         : Interface( interface ), VCells( volCells )
00020     {
00021     }
00022 
00023     bool findSkins( smoab::CellSets& surfaceCellSets );
00024 };
00025 
00026 //----------------------------------------------------------------------------
00027 bool ExtractShell::findSkins( smoab::CellSets& surfaceCellSets )
00028 {
00029     typedef smoab::Range::const_iterator Iterator;
00030 
00031     typedef smoab::CellSets::const_iterator SetIterator;
00032 
00033     smoab::Range cellsToRemove;
00034     for( SetIterator set = this->VCells.begin(); set != this->VCells.end(); ++set )
00035     {
00036         const smoab::Range& cells = set->cells();
00037         this->Interface.createAdjacencies( set->cells(), 2 );
00038 
00039         //we create the usage table for each iteration so that we only
00040         //get the shell of each cell set. If we used the table between
00041         //sets we would get the shell of the combined sets
00042         smoab::detail::UsageTable table;
00043         for( Iterator i = cells.begin(); i != cells.end(); ++i )
00044         {
00045             std::vector< smoab::EntityHandle > faceCells = this->Interface.sideElements( *i, 2 );
00046 
00047             //the usage id allows you to label cells when going into the table
00048             //so that you can extract multiple shells where each is based on
00049             //a single region id.
00050             std::vector< int > regionId( 1, faceCells.size() );
00051             table.incrementUsage( faceCells, regionId );
00052         }
00053         smoab::Range surfaceCells = table.singleUsage();
00054 
00055         //create a new cell set that
00056         smoab::CellSet surfaceSet( set->entity(), surfaceCells );
00057         surfaceCellSets.push_back( surfaceSet );
00058 
00059         smoab::Range subsetToRemove = table.multipleUsage();
00060         cellsToRemove.insert( subsetToRemove.begin(), subsetToRemove.end() );
00061     }
00062 
00063     //we will remove all cells that have multiple usages from the moab database
00064     //I really don't care if they already existed or not.
00065     this->Interface.remove( cellsToRemove );
00066     return true;
00067 }
00068 
00069 }  // namespace smoab
00070 
00071 #endif  // __smoab_ExtractShell_h
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