TestExodusII.cpp

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/** @example TestExodusII.cpp
 * This example demonstrates how to retrieve material, dirichlet and neumann sets
 * from an ExodusII file. \n
 * Sets in MOAB contain entities and have a tag on them to give meaning to the entities.
 * Tag names: MATERIAL_SET", "DIRICHLET_SET" and "NEUMANN_SET" are reserved and
 * are associated with their corresponding entity sets.
 * Sets are traversed to find out the type number of entities contained in each set. \n
 *
 * <b>Steps in this example </b>:
 *    -# Instantiate MOAB
 *    -# Get input mesh file name and load it.
 *    -# Loop over the three sets: material, dirichlet and neumann
 *      -# Get TagHandle and EntitySet(corresponding to the TagHandle)
 *      -# Loop thru all the EntitySet's
 *        -# Get the set id and entities in this set
 *    -# Destroy the MOAB instance
 *
 *
 * <b> To compile: </b>
 *    make TestExodusII \n
 *
 * <b> To run: </b>
 *    -# TestExodusII <mesh-file> \n
 *    -# TestExodusII (This uses the default <mesh-file>: MeshFiles/unittest/mbtest2.g)
 */
#include <iostream>
#include <memory>
 
// Include header for MOAB instance and range
#include "moab/Core.hpp"
 
using namespace moab;
using namespace std;
 
int main( int argc, char** argv )
{
#ifdef MOAB_HAVE_NETCDF
    // Get MOAB instance
    std::unique_ptr< Interface > mb( new( std::nothrow ) Core );
    if( NULL == mb ) return 1;
 
    // Get the material set tag handle
    Tag mtag;
    ErrorCode rval;
    const char* tag_nms[] = { "MATERIAL_SET", "DIRICHLET_SET", "NEUMANN_SET" };
    Range sets, set_ents;
 
    // Load a file
    if( argc == 1 )
    {
        cout << "Running default case, loading " << test_file_name << endl;
        cout << "Usage: " << argv[0] << " <filename>\n" << endl;
        MB_CHK_ERR( mb->load_file( test_file_name.c_str() ) );
    }
    else
    {
        MB_CHK_ERR( mb->load_file( argv[argc - 1] ) );
        cout << "Loaded mesh file: " << argv[argc - 1] << endl;
    }
 
    // Loop over set types
    for( int i = 0; i < 3; i++ )
    {
        MB_CHK_ERR( mb->tag_get_handle( tag_nms[i], 1, MB_TYPE_INTEGER, mtag ) );
 
        // Get all the sets of that type in the mesh
        sets.clear();
        MB_CHK_ERR( mb->get_entities_by_type_and_tag( 0, MBENTITYSET, &mtag, NULL, 1, sets ) );
 
        // Iterate over each set, getting entities
        for( EntityHandle this_set : sets )
        {
            // Get the id for this set
            int set_id;
            MB_CHK_ERR( mb->tag_get_data( mtag, &this_set, 1, &set_id ) );
 
            // Get the entities in the set, recursively
            MB_CHK_ERR( mb->get_entities_by_handle( this_set, set_ents, true ) );
 
            cout << tag_nms[i] << " " << set_id << " has " << set_ents.size() << " entities:" << endl;
 
            // Print the entities contained in this set
            set_ents.print( "   " );
            set_ents.clear();
        }
    }
 
#else
    cout << " This test needs moab configured with netcdf \n";
#endif
 
    return 0;
}