MOAB: Mesh Oriented datABase  (version 5.2.1)
cgm2moab.cpp
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00001 #include "cgm2moab.hpp"
00002 #include "moab/ProgOptions.hpp"
00003 
00004 #include "moab/Core.hpp"
00005 #include "moab/Range.hpp"
00006 #include "moab/CartVect.hpp"
00007 #include "MBTagConventions.hpp"
00008 #include "moab/GeomQueryTool.hpp"
00009 #include "moab/GeomTopoTool.hpp"
00010 
00011 #include <sstream>
00012 #include <iomanip>
00013 #include <cstdlib>
00014 #include <algorithm>
00015 #include <cstdio>
00016 
00017 using namespace moab;
00018 
00019 bool verbose = false;
00020 
00021 void chkerr( Interface* mbi, ErrorCode code, int line, const char* file )
00022 {
00023 
00024     if( code != MB_SUCCESS )
00025     {
00026         std::cerr << "Error: " << mbi->get_error_string( code ) << " (" << code << ")" << std::endl;
00027         std::string message;
00028         if( MB_SUCCESS == mbi->get_last_error( message ) && !message.empty() )
00029             std::cerr << "Error message: " << message << std::endl;
00030         std::string fname = file;
00031         size_t slash      = fname.find_last_of( '/' );
00032         if( slash != fname.npos ) { fname = fname.substr( slash + 1 ); }
00033         std::cerr << "At " << fname << " line: " << line << std::endl;
00034         std::exit( EXIT_FAILURE );
00035     }
00036 }
00037 
00038 void chkerr( Interface& mbi, ErrorCode code, int line, const char* file )
00039 {
00040     chkerr( &mbi, code, line, file );
00041 }
00042 
00043 void chkerr( GeomTopoTool& gtt, ErrorCode code, int line, const char* file )
00044 {
00045     chkerr( gtt.get_moab_instance(), code, line, file );
00046 }
00047 
00048 /**
00049  * Estimate the volume of the surface (actually multiplied by a factor of six).
00050  * See DagMC::measure_volume, from which this code is borrowed, for algorithmic details.
00051  * For our purpose, all that matters is the signedness.
00052  *
00053  * @param offset Offset to apply to surface to avoid a zero result.
00054  */
00055 static ErrorCode get_signed_volume( Interface* MBI, const EntityHandle surf_set, const CartVect& offset,
00056                                     double& signed_volume )
00057 {
00058     ErrorCode rval;
00059     Range tris;
00060     rval = MBI->get_entities_by_type( surf_set, MBTRI, tris );
00061     if( MB_SUCCESS != rval ) return rval;
00062 
00063     signed_volume = 0.0;
00064     const EntityHandle* conn;
00065     int len;
00066     CartVect coords[3];
00067     for( Range::iterator j = tris.begin(); j != tris.end(); ++j )
00068     {
00069         rval = MBI->get_connectivity( *j, conn, len, true );
00070         if( MB_SUCCESS != rval ) return rval;
00071         if( 3 != len ) return MB_INVALID_SIZE;
00072         rval = MBI->get_coords( conn, 3, coords[0].array() );
00073         if( MB_SUCCESS != rval ) return rval;
00074 
00075         // Apply offset to avoid calculating 0 for cases when the origin is in the
00076         // plane of the surface.
00077         for( unsigned int k = 0; k < 3; ++k )
00078         {
00079             coords[k] += offset;
00080         }
00081 
00082         coords[1] -= coords[0];
00083         coords[2] -= coords[0];
00084         signed_volume += ( coords[0] % ( coords[1] * coords[2] ) );
00085     }
00086     return MB_SUCCESS;
00087 }
00088 
00089 /**
00090  * Replace the triangles in an old surface with those in a new surface, ensuring
00091  * that their surfaces senses match before the replacement
00092  */
00093 static ErrorCode replace_surface( Interface* mbi, EntityHandle old_surf, EntityHandle old_file_set,
00094                                   EntityHandle new_surf, const Tag& senseTag )
00095 {
00096 
00097     ErrorCode rval;
00098 
00099     // Get the signed volume for each surface representation. If a volume comes
00100     // back as zero, it's probably because a planar surface passes through the
00101     // origin.  In that case, try applying random offsets until reasonable
00102     // values are returned.
00103 
00104     CartVect offset;             // start with no offset
00105     const double min_vol = 0.1;  // try again if abs(vol) < this value
00106 
00107     double old_vol = 0, new_vol = 0;
00108 
00109     bool success     = false;
00110     int num_attempts = 100;
00111 
00112     while( num_attempts-- > 0 )
00113     {
00114 
00115         rval = get_signed_volume( mbi, old_surf, offset, old_vol );
00116         if( MB_SUCCESS != rval ) return rval;
00117 
00118         rval = get_signed_volume( mbi, new_surf, offset, new_vol );
00119         if( MB_SUCCESS != rval ) return rval;
00120 
00121         if( std::fabs( old_vol ) >= min_vol && std::fabs( new_vol ) >= min_vol )
00122         {
00123             success = true;
00124             break;
00125         }
00126 
00127         // haven't succeeded yet: randomize the offset vector
00128         const int max_random = 10;
00129         for( int i = 0; i < 3; ++i )
00130         {
00131             offset[i] = std::rand() % max_random;
00132         }
00133     }
00134 
00135     if( !success )
00136     {
00137         std::cerr << "Error: could not calculate a surface volume" << std::endl;
00138         return MB_FAILURE;
00139     }
00140 
00141     // If the sign is different, reverse the old surf senses so that both
00142     // representations have the same signed volume.
00143     if( ( old_vol < 0 && new_vol > 0 ) || ( old_vol > 0 && new_vol < 0 ) )
00144     {
00145 
00146         EntityHandle old_surf_volumes[2];
00147         rval = mbi->tag_get_data( senseTag, &old_surf, 1, old_surf_volumes );
00148         if( MB_SUCCESS != rval ) return rval;
00149 
00150         std::swap( old_surf_volumes[0], old_surf_volumes[1] );
00151 
00152         rval = mbi->tag_set_data( senseTag, &old_surf, 1, old_surf_volumes );
00153         if( MB_SUCCESS != rval ) return rval;
00154     }
00155 
00156     int num_old_tris, num_new_tris;
00157 
00158     // Remove the tris from the old surf. Also remove them from the
00159     // old_file_set because it is not TRACKING.
00160     Range old_tris;
00161     rval = mbi->get_entities_by_type( old_surf, MBTRI, old_tris );
00162     if( MB_SUCCESS != rval ) return rval;
00163     num_old_tris = old_tris.size();
00164     rval         = mbi->remove_entities( old_surf, old_tris );
00165     if( MB_SUCCESS != rval ) return rval;
00166     rval = mbi->remove_entities( old_file_set, old_tris );
00167     if( MB_SUCCESS != rval ) return rval;
00168     rval = mbi->delete_entities( old_tris );
00169     if( MB_SUCCESS != rval ) return rval;
00170 
00171     // Add the new_surf's triangles to the old_surf
00172     Range new_tris;
00173     rval = mbi->get_entities_by_type( new_surf, MBTRI, new_tris );
00174     if( MB_SUCCESS != rval ) return rval;
00175     num_new_tris = new_tris.size();
00176     rval         = mbi->add_entities( old_surf, new_tris );
00177     if( MB_SUCCESS != rval ) return rval;
00178 
00179     if( verbose ) { std::cout << num_old_tris << " tris -> " << num_new_tris << " tris" << std::endl; }
00180 
00181     return MB_SUCCESS;
00182 }
00183 
00184 /**
00185  * Given an "old" file and a "new" file, replace the facets in any surface of the old
00186  * file with facets from the new file.
00187  */
00188 static ErrorCode merge_input_surfs( Interface* mbi, const EntityHandle old_file_set, const EntityHandle new_file_set,
00189                                     const Tag& idTag, const Tag& dimTag, const Tag& senseTag )
00190 {
00191     ErrorCode rval;
00192 
00193     const int two           = 2;
00194     const Tag tags[2]       = { dimTag, idTag };
00195     const void* tag_vals[2] = { &two, NULL };
00196 
00197     Range old_surfs;
00198     rval = mbi->get_entities_by_type_and_tag( old_file_set, MBENTITYSET, &dimTag, tag_vals, 1, old_surfs );
00199     if( MB_SUCCESS != rval ) return rval;
00200 
00201     int count = 0;
00202 
00203     for( Range::iterator i = old_surfs.begin(); i != old_surfs.end(); ++i )
00204     {
00205         EntityHandle old_surf = *i;
00206 
00207         int surf_id;
00208         rval = mbi->tag_get_data( idTag, &old_surf, 1, &surf_id );
00209         if( MB_SUCCESS != rval ) return rval;
00210 
00211         Range new_surf_range;
00212         tag_vals[1] = &surf_id;
00213         rval        = mbi->get_entities_by_type_and_tag( new_file_set, MBENTITYSET, tags, tag_vals, 2, new_surf_range );
00214         if( MB_SUCCESS != rval ) return rval;
00215 
00216         if( new_surf_range.size() != 1 )
00217         {
00218             if( new_surf_range.size() > 1 )
00219             {
00220                 std::cerr << "Warning: surface " << surf_id << " has more than one representation in new file"
00221                           << std::endl;
00222             }
00223             continue;
00224         }
00225 
00226         // Now we have found a surf in new_file_set to replace an old surf
00227         EntityHandle new_surf = new_surf_range[0];
00228 
00229         // TODO: check for quads and convert to triangles
00230 
00231         if( verbose ) { std::cout << "Surface " << surf_id << ": " << std::flush; }
00232         rval = replace_surface( mbi, old_surf, old_file_set, new_surf, senseTag );
00233         if( MB_SUCCESS != rval ) return rval;
00234         count++;
00235     }
00236 
00237     std::cout << "Replaced " << count << " surface" << ( count == 1 ? "." : "s." ) << std::endl;
00238 
00239     return MB_SUCCESS;
00240 }
00241 
00242 int main( int argc, char* argv[] )
00243 {
00244 
00245     ProgOptions po( "cgm2moab: a tool for preprocessing CAD and mesh files for analysis" );
00246 
00247     std::string input_file;
00248     std::string output_file = "dagmc_preproc_out.h5m";
00249     int grid                = 50;
00250 
00251     po.addOpt< void >( ",v", "Verbose output", &verbose );
00252     po.addOpt< std::string >( "outmesh,o", "Specify output file name (default " + output_file + ")", &output_file );
00253     po.addOpt< void >( "no-outmesh,", "Do not write an output mesh" );
00254     po.addOpt< std::string >( ",m", "Specify alternate input mesh to override surfaces in input_file" );
00255     po.addOpt< std::string >( "obb-vis,O", "Specify obb visualization output file (default none)" );
00256     po.addOpt< int >( "obb-vis-divs", "Resolution of obb visualization grid (default 50)", &grid );
00257     po.addOpt< void >( "obb-stats,S", "Print obb statistics.  With -v, print verbose statistics." );
00258     po.addOpt< std::vector< int > >( "vols,V",
00259                                      "Specify a set of volumes (applies to --obb_vis and --obb_stats, default all)" );
00260     po.addOptionHelpHeading( "Options for loading CAD files" );
00261     po.addOpt< double >( "ftol,f", "Faceting distance tolerance", po.add_cancel_opt );
00262     po.addOpt< double >( "ltol,l", "Faceting edge length tolerance", po.add_cancel_opt );
00263     po.addOpt< int >( "atol,a", "Faceting normal angle tolerance (degrees)", po.add_cancel_opt );
00264     po.addOpt< void >( "all-warnings", "Verbose warnings about attributes and curve tolerances" );
00265     po.addOpt< void >( "no-attribs", "Do not actuate CGM attributes" );
00266     po.addOpt< void >( "fatal_curves", "Fatal Error when curves cannot be faceted" );
00267 
00268     po.addRequiredArg< std::string >( "input_file", "Path to input file for preprocessing", &input_file );
00269 
00270     po.parseCommandLine( argc, argv );
00271 
00272     /* Check that user has asked for at least one useful thing to be done */
00273     bool obb_task = po.numOptSet( "obb-vis" ) || po.numOptSet( "obb-stats" );
00274 
00275     if( po.numOptSet( "no-outmesh" ) && !obb_task )
00276     { po.error( "Nothing to do.  Please specify an OBB-related option, or remove --no_outmesh." ); }
00277 
00278     /* Load input file, with CAD processing options, if specified */
00279     std::string options;
00280 #define OPTION_APPEND( X )                     \
00281     {                                          \
00282         if( options.length() ) options += ";"; \
00283         options += ( X );                      \
00284     }
00285 
00286     if( po.numOptSet( "no-attribs" ) ) { OPTION_APPEND( "CGM_ATTRIBS=no" ); }
00287 
00288     if( po.numOptSet( "fatal_curves" ) ) { OPTION_APPEND( "FATAL_ON_CURVES" ); }
00289 
00290     if( po.numOptSet( "all-warnings" ) ) { OPTION_APPEND( "VERBOSE_CGM_WARNINGS" ); }
00291 
00292     // This is more roundabout than necessary, but we don't want *any* of the CGM-specific options
00293     //   to appear in the option string unless they were explicitly requested
00294     double tol;
00295     static const int tol_prec = 12;
00296     if( po.getOpt( "ftol", &tol ) )
00297     {
00298         std::stringstream s;
00299         s << "FACET_DISTANCE_TOLERANCE=" << std::setprecision( tol_prec ) << tol;
00300         OPTION_APPEND( s.str() );
00301     }
00302 
00303     if( po.getOpt( "ltol", &tol ) )
00304     {
00305         std::stringstream s;
00306         s << "MAX_FACET_EDGE_LENGTH=" << std::setprecision( tol_prec ) << tol;
00307         OPTION_APPEND( s.str() );
00308     }
00309 
00310     int atol;
00311     if( po.getOpt( "atol", &atol ) )
00312     {
00313         std::stringstream s;
00314         s << "FACET_NORMAL_TOLERANCE=" << atol;
00315         OPTION_APPEND( s.str() );
00316     }
00317 
00318 #undef OPTION_APPEND
00319 
00320     /* Load main input file */
00321     if( verbose )
00322     {
00323         std::cout << "Loading file " << input_file << std::endl;
00324         if( options.length() ) std::cout << "Option string: " << options << std::endl;
00325     }
00326 
00327     EntityHandle input_file_set;
00328     ErrorCode ret;
00329     Core mbi;
00330 
00331     ret = mbi.create_meshset( 0, input_file_set );
00332     CHECKERR( mbi, ret );
00333 
00334     ret = mbi.load_file( input_file.c_str(), &input_file_set, options.c_str() );
00335     if( ret == MB_UNHANDLED_OPTION )
00336     { std::cerr << "Warning: unhandled option while loading input_file, will proceed anyway" << std::endl; }
00337     else
00338     {
00339         CHECKERR( mbi, ret );
00340     }
00341 
00342     /* Iterate through any -m alternate mesh files and replace surfaces */
00343 
00344     std::vector< std::string > m_list;
00345     po.getOptAllArgs( ",m", m_list );
00346 
00347     if( m_list.size() > 0 )
00348     {
00349 
00350         if( obb_task )
00351         { std::cerr << "Warning: using obb features in conjunction with -m may not work correctly!" << std::endl; }
00352 
00353         // Create tags
00354         Tag dimTag, idTag, senseTag;
00355         ret = mbi.tag_get_handle( GEOM_DIMENSION_TAG_NAME, 1, MB_TYPE_INTEGER, dimTag, MB_TAG_SPARSE | MB_TAG_CREAT );
00356         CHECKERR( mbi, ret );
00357 
00358         idTag = mbi.globalId_tag();
00359 
00360         ret = mbi.tag_get_handle( "GEOM_SENSE_2", 2, MB_TYPE_HANDLE, senseTag, MB_TAG_SPARSE | MB_TAG_CREAT );
00361         CHECKERR( mbi, ret );
00362 
00363         for( std::vector< std::string >::iterator i = m_list.begin(); i != m_list.end(); ++i )
00364         {
00365             std::cout << "Loading alternate mesh file " << *i << std::endl;
00366 
00367             EntityHandle alt_file_set;
00368             ret = mbi.create_meshset( 0, alt_file_set );
00369             CHECKERR( mbi, ret );
00370 
00371             ret = mbi.load_file( ( *i ).c_str(), &alt_file_set );
00372             CHECKERR( mbi, ret );
00373 
00374             if( verbose ) std::cout << "Merging input surfaces..." << std::flush;
00375 
00376             ret = merge_input_surfs( &mbi, input_file_set, alt_file_set, idTag, dimTag, senseTag );
00377             CHECKERR( mbi, ret );
00378 
00379             if( verbose ) std::cout << "done." << std::endl;
00380         }
00381     }
00382 
00383     /* Write output file */
00384 
00385     if( !po.numOptSet( "no-outmesh" ) )
00386     {
00387         if( verbose ) { std::cout << "Writing " << output_file << std::endl; }
00388         ret = mbi.write_file( output_file.c_str(), NULL, NULL, &input_file_set, 1 );
00389         CHECKERR( mbi, ret );
00390     }
00391 
00392     /* OBB statistics and visualization */
00393     if( obb_task )
00394     {
00395 
00396         if( verbose ) { std::cout << "Loading data into GeomTopoTool" << std::endl; }
00397         GeomTopoTool* gtt = new GeomTopoTool( &mbi, false );
00398         ret               = gtt->find_geomsets();
00399         CHECKERR( *gtt, ret );
00400         ret = gtt->construct_obb_trees();
00401         CHECKERR( *gtt, ret );
00402     }
00403     return 0;
00404 }
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