MOAB: Mesh Oriented datABase  (version 5.2.1)
copyPartition.cpp

copy partition info on a mesh file from a point cloud this tool will take an existing h5m phys grid partition file (point cloud) and copy the partition information on a pg2 mesh file, for better viewing with VisIt

example of usage: ./copyPartition -p AtmPhys.h5m -g wholeATM_PG2.h5m -o atm_PG2_part.h5m

the *PG2" style atm mesh is available in E3SM only for pg2 runs, something like --res ne30pg2_r05_oECv3_ICG --compset A_WCYCL1850S_CMIP6 or --res ne4pg2_ne4pg2 --compset FC5AV1C-L

/** @example copyPartition.cpp  copy partition info on a mesh file from a point cloud
 * this tool will take an existing h5m  phys grid partition file (point cloud) and copy the
 * partition information on a pg2 mesh file, for better viewing with VisIt
 *
 * example of usage:
 * ./copyPartition -p AtmPhys.h5m -g wholeATM_PG2.h5m -o atm_PG2_part.h5m
 *
 * the *PG2" style atm mesh is available in E3SM only for pg2 runs, something like
 *  --res ne30pg2_r05_oECv3_ICG --compset A_WCYCL1850S_CMIP6
 *  or
 *  --res ne4pg2_ne4pg2 --compset FC5AV1C-L
 */
#include "moab/ProgOptions.hpp"
#include "moab/Core.hpp"

#include <math.h>
#include <sstream>

using namespace moab;

int main( int argc, char* argv[] )
{

    ProgOptions opts;

    std::string physfile, pg2file, outfile;

    opts.addOpt< std::string >( "physgridfile,p", "phys grid filename", &physfile );
    opts.addOpt< std::string >( "pg2file,g", "pg2 mesh file", &pg2file );
    opts.addOpt< std::string >( "output,o", "output mesh filename", &outfile );

    opts.parseCommandLine( argc, argv );


    std::cout << "phys grid cloud file: " << physfile << "\n";
    std::cout << "pg2 mesh file: " << pg2file << "\n";
    std::cout << "output file: " << outfile << "\n";

    if( physfile.empty() )
    {
        opts.printHelp();
        return 0;
    }
    ErrorCode rval;
    Core* mb = new Core();

    rval = mb->load_file( physfile.c_str() );MB_CHK_SET_ERR( rval, "can't load phys grid file" );

    Core* mb2 = new Core();
    rval      = mb2->load_file( pg2file.c_str() );MB_CHK_SET_ERR( rval, "can't load pg2 mesh file" );

    Tag globalIDTag1 = mb->globalId_tag();
    Tag parti;
    rval = mb->tag_get_handle( "partition", parti );MB_CHK_SET_ERR( rval, "can't get partition tag phys grid mesh " );

    Tag globalIDTag2 = mb2->globalId_tag();

    Range verts1;
    rval = mb->get_entities_by_dimension( 0, 0, verts1 );MB_CHK_SET_ERR( rval, "can't get vertices " );

    std::vector< int > partValues;
    partValues.resize( verts1.size() );
    rval = mb->tag_get_data( parti, verts1, &partValues[0] );MB_CHK_SET_ERR( rval, "can't get parts values on vertices " );

    Range cells;
    rval = mb2->get_entities_by_dimension( 0, 2, cells );MB_CHK_SET_ERR( rval, "can't get 2d cells " );
    std::vector< int > globalIdsCells;
    globalIdsCells.resize( cells.size() );
    rval = mb2->tag_get_data( globalIDTag2, cells, &globalIdsCells[0] );MB_CHK_SET_ERR( rval, "can't get global ids cells " );

    std::vector< int > globalIdsVerts;
    globalIdsVerts.resize( verts1.size() );
    rval = mb->tag_get_data( globalIDTag1, verts1, &globalIdsVerts[0] );MB_CHK_SET_ERR( rval, "can't get global ids cells " );

    Tag partTag;
    rval = mb2->tag_get_handle( "PARALLEL_PARTITION", partTag );MB_CHK_SET_ERR( rval, "can't partition tag " );

    Range sets;
    rval = mb2->get_entities_by_type_and_tag( 0, MBENTITYSET, &partTag, NULL, 1, sets );MB_CHK_ERR( rval );

    std::vector< int > setValues;
    setValues.resize( sets.size() );
    rval = mb2->tag_get_data( partTag, sets, &setValues[0] );MB_CHK_ERR( rval );

    std::map< int, EntityHandle > valToSet;
    int i = 0;
    for( Range::iterator st = sets.begin(); st != sets.end(); ++st, i++ )
    {
        valToSet[setValues[i]] = *st;
    }
    // now, every cell will be put into one set, by looking at the global id of cell

    std::map< int, EntityHandle > gidToCell;
    i = 0;
    for( Range::iterator it = cells.begin(); it != cells.end(); ++it, i++ )
    {
        gidToCell[globalIdsCells[i]] = *it;
    }
    // empty all sets
    rval = mb2->clear_meshset( sets );MB_CHK_ERR( rval );

    // look now at parti values for vertices, and their global ids
    for( i = 0; i < (int)verts1.size(); i++ )
    {
        int part          = partValues[i];
        int gid           = globalIdsVerts[i];
        EntityHandle set1 = valToSet[part];
        EntityHandle cell = gidToCell[gid];
        rval              = mb2->add_entities( set1, &cell, 1 );MB_CHK_ERR( rval );
    }

    rval = mb2->write_file( outfile.c_str() );MB_CHK_SET_ERR( rval, "can't write file" );

    delete mb;
    delete mb2;

    return 0;
}
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