Mesh Oriented datABase  (version 5.5.1)
An array-based unstructured mesh library
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/Core.hpp"
#include <cmath>
#include <sstream>
using namespace moab;
int main( int argc, char* argv[] )
{
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;
}