cgm2moab.cpp

Go to the documentation of this file.

#include "cgm2moab.hpp"
#include "moab/ProgOptions.hpp"
 
#include "moab/Core.hpp"
#include "moab/Range.hpp"
#include "moab/CartVect.hpp"
#include "MBTagConventions.hpp"
#include "moab/GeomQueryTool.hpp"
#include "moab/GeomTopoTool.hpp"
 
#include <sstream>
#include <iomanip>
#include <cstdlib>
#include <algorithm>
#include <cstdio>
 
using namespace moab;
 
bool verbose = false;
 
void chkerr( Interface* mbi, ErrorCode code, int line, const char* file )
{
 
 if( code != MB_SUCCESS )
 {
 std::cerr << "Error: " << mbi->get_error_string( code ) << " (" << code << ")" << std::endl;
 std::string message;
 if( MB_SUCCESS == mbi->get_last_error( message ) && !message.empty() )
 std::cerr << "Error message: " << message << std::endl;
 std::string fname = file;
 size_t slash = fname.find_last_of( '/' );
 if( slash != fname.npos )
 {
 fname = fname.substr( slash + 1 );
 }
 std::cerr << "At " << fname << " line: " << line << std::endl;
 std::exit( EXIT_FAILURE );
 }
}
 
void chkerr( Interface& mbi, ErrorCode code, int line, const char* file )
{
 chkerr( &mbi, code, line, file );
}
 
void chkerr( GeomTopoTool& gtt, ErrorCode code, int line, const char* file )
{
 chkerr( gtt.get_moab_instance(), code, line, file );
}
 
/**
 * Estimate the volume of the surface (actually multiplied by a factor of six).
 * See DagMC::measure_volume, from which this code is borrowed, for algorithmic details.
 * For our purpose, all that matters is the signedness.
 *
 * @param offset Offset to apply to surface to avoid a zero result.
 */
static ErrorCode get_signed_volume( Interface* MBI,
 const EntityHandle surf_set,
 const CartVect& offset,
 double& signed_volume )
{
 ErrorCode rval;
 Range tris;
 rval = MBI->get_entities_by_type( surf_set, MBTRI, tris );
 if( MB_SUCCESS != rval ) return rval;
 
 signed_volume = 0.0;
 const EntityHandle* conn;
 int len;
 CartVect coords[3];
 for( Range::iterator j = tris.begin(); j != tris.end(); ++j )
 {
 rval = MBI->get_connectivity( *j, conn, len, true );
 if( MB_SUCCESS != rval ) return rval;
 if( 3 != len ) return MB_INVALID_SIZE;
 rval = MBI->get_coords( conn, 3, coords[0].array() );
 if( MB_SUCCESS != rval ) return rval;
 
 // Apply offset to avoid calculating 0 for cases when the origin is in the
 // plane of the surface.
 for( unsigned int k = 0; k < 3; ++k )
 {
 coords[k] += offset;
 }
 
 coords[1] -= coords[0];
 coords[2] -= coords[0];
 signed_volume += ( coords[0] % ( coords[1] * coords[2] ) );
 }
 return MB_SUCCESS;
}
 
/**
 * Replace the triangles in an old surface with those in a new surface, ensuring
 * that their surfaces senses match before the replacement
 */
static ErrorCode replace_surface( Interface* mbi,
 EntityHandle old_surf,
 EntityHandle old_file_set,
 EntityHandle new_surf,
 const Tag& senseTag )
{
 
 ErrorCode rval;
 
 // Get the signed volume for each surface representation. If a volume comes
 // back as zero, it's probably because a planar surface passes through the
 // origin. In that case, try applying random offsets until reasonable
 // values are returned.
 
 CartVect offset; // start with no offset
 const double min_vol = 0.1; // try again if abs(vol) < this value
 
 double old_vol = 0, new_vol = 0;
 
 bool success = false;
 int num_attempts = 100;
 
 while( num_attempts-- > 0 )
 {
 
 rval = get_signed_volume( mbi, old_surf, offset, old_vol );
 if( MB_SUCCESS != rval ) return rval;
 
 rval = get_signed_volume( mbi, new_surf, offset, new_vol );
 if( MB_SUCCESS != rval ) return rval;
 
 if( std::fabs( old_vol ) >= min_vol && std::fabs( new_vol ) >= min_vol )
 {
 success = true;
 break;
 }
 
 // haven't succeeded yet: randomize the offset vector
 const int max_random = 10;
 for( int i = 0; i < 3; ++i )
 {
 offset[i] = std::rand() % max_random;
 }
 }
 
 if( !success )
 {
 std::cerr << "Error: could not calculate a surface volume" << std::endl;
 return MB_FAILURE;
 }
 
 // If the sign is different, reverse the old surf senses so that both
 // representations have the same signed volume.
 if( ( old_vol < 0 && new_vol > 0 ) || ( old_vol > 0 && new_vol < 0 ) )
 {
 
 EntityHandle old_surf_volumes[2];
 rval = mbi->tag_get_data( senseTag, &old_surf, 1, old_surf_volumes );
 if( MB_SUCCESS != rval ) return rval;
 
 std::swap( old_surf_volumes[0], old_surf_volumes[1] );
 
 rval = mbi->tag_set_data( senseTag, &old_surf, 1, old_surf_volumes );
 if( MB_SUCCESS != rval ) return rval;
 }
 
 int num_old_tris, num_new_tris;
 
 // Remove the tris from the old surf. Also remove them from the
 // old_file_set because it is not TRACKING.
 Range old_tris;
 rval = mbi->get_entities_by_type( old_surf, MBTRI, old_tris );
 if( MB_SUCCESS != rval ) return rval;
 num_old_tris = old_tris.size();
 rval = mbi->remove_entities( old_surf, old_tris );
 if( MB_SUCCESS != rval ) return rval;
 rval = mbi->remove_entities( old_file_set, old_tris );
 if( MB_SUCCESS != rval ) return rval;
 rval = mbi->delete_entities( old_tris );
 if( MB_SUCCESS != rval ) return rval;
 
 // Add the new_surf's triangles to the old_surf
 Range new_tris;
 rval = mbi->get_entities_by_type( new_surf, MBTRI, new_tris );
 if( MB_SUCCESS != rval ) return rval;
 num_new_tris = new_tris.size();
 rval = mbi->add_entities( old_surf, new_tris );
 if( MB_SUCCESS != rval ) return rval;
 
 if( verbose )
 {
 std::cout << num_old_tris << " tris -> " << num_new_tris << " tris" << std::endl;
 }
 
 return MB_SUCCESS;
}
 
/**
 * Given an "old" file and a "new" file, replace the facets in any surface of the old
 * file with facets from the new file.
 */
static ErrorCode merge_input_surfs( Interface* mbi,
 const EntityHandle old_file_set,
 const EntityHandle new_file_set,
 const Tag& idTag,
 const Tag& dimTag,
 const Tag& senseTag )
{
 ErrorCode rval;
 
 const int two = 2;
 const Tag tags[2] = { dimTag, idTag };
 const void* tag_vals[2] = { &two, NULL };
 
 Range old_surfs;
 rval = mbi->get_entities_by_type_and_tag( old_file_set, MBENTITYSET, &dimTag, tag_vals, 1, old_surfs );
 if( MB_SUCCESS != rval ) return rval;
 
 int count = 0;
 
 for( Range::iterator i = old_surfs.begin(); i != old_surfs.end(); ++i )
 {
 EntityHandle old_surf = *i;
 
 int surf_id;
 rval = mbi->tag_get_data( idTag, &old_surf, 1, &surf_id );
 if( MB_SUCCESS != rval ) return rval;
 
 Range new_surf_range;
 tag_vals[1] = &surf_id;
 rval = mbi->get_entities_by_type_and_tag( new_file_set, MBENTITYSET, tags, tag_vals, 2, new_surf_range );
 if( MB_SUCCESS != rval ) return rval;
 
 if( new_surf_range.size() != 1 )
 {
 if( new_surf_range.size() > 1 )
 {
 std::cerr << "Warning: surface " << surf_id << " has more than one representation in new file"
 << std::endl;
 }
 continue;
 }
 
 // Now we have found a surf in new_file_set to replace an old surf
 EntityHandle new_surf = new_surf_range[0];
 
 // TODO: check for quads and convert to triangles
 
 if( verbose )
 {
 std::cout << "Surface " << surf_id << ": " << std::flush;
 }
 rval = replace_surface( mbi, old_surf, old_file_set, new_surf, senseTag );
 if( MB_SUCCESS != rval ) return rval;
 count++;
 }
 
 std::cout << "Replaced " << count << " surface" << ( count == 1 ? "." : "s." ) << std::endl;
 
 return MB_SUCCESS;
}
 
int main( int argc, char* argv[] )
{
 
 ProgOptions po( "cgm2moab: a tool for preprocessing CAD and mesh files for analysis" );
 
 std::string input_file;
 std::string output_file = "dagmc_preproc_out.h5m";
 int grid = 50;
 
 po.addOpt< void >( ",v", "Verbose output", &verbose );
 po.addOpt< std::string >( "outmesh,o", "Specify output file name (default " + output_file + ")", &output_file );
 po.addOpt< void >( "no-outmesh,", "Do not write an output mesh" );
 po.addOpt< std::string >( ",m", "Specify alternate input mesh to override surfaces in input_file" );
 po.addOpt< std::string >( "obb-vis,O", "Specify obb visualization output file (default none)" );
 po.addOpt< int >( "obb-vis-divs", "Resolution of obb visualization grid (default 50)", &grid );
 po.addOpt< void >( "obb-stats,S", "Print obb statistics. With -v, print verbose statistics." );
 po.addOpt< std::vector< int > >( "vols,V",
 "Specify a set of volumes (applies to --obb_vis and --obb_stats, default all)" );
 po.addOptionHelpHeading( "Options for loading CAD files" );
 po.addOpt< double >( "ftol,f", "Faceting distance tolerance", po.add_cancel_opt );
 po.addOpt< double >( "ltol,l", "Faceting edge length tolerance", po.add_cancel_opt );
 po.addOpt< int >( "atol,a", "Faceting normal angle tolerance (degrees)", po.add_cancel_opt );
 po.addOpt< void >( "all-warnings", "Verbose warnings about attributes and curve tolerances" );
 po.addOpt< void >( "no-attribs", "Do not actuate CGM attributes" );
 po.addOpt< void >( "fatal_curves", "Fatal Error when curves cannot be faceted" );
 
 po.addRequiredArg< std::string >( "input_file", "Path to input file for preprocessing", &input_file );
 
 po.parseCommandLine( argc, argv );
 
 /* Check that user has asked for at least one useful thing to be done */
 bool obb_task = po.numOptSet( "obb-vis" ) || po.numOptSet( "obb-stats" );
 
 if( po.numOptSet( "no-outmesh" ) && !obb_task )
 {
 po.error( "Nothing to do. Please specify an OBB-related option, or remove --no_outmesh." );
 }
 
 /* Load input file, with CAD processing options, if specified */
 std::string options;
#define OPTION_APPEND( X ) \
 { \
 if( options.length() ) options += ";"; \
 options += ( X ); \
 }
 
 if( po.numOptSet( "no-attribs" ) )
 {
 OPTION_APPEND( "CGM_ATTRIBS=no" );
 }
 
 if( po.numOptSet( "fatal_curves" ) )
 {
 OPTION_APPEND( "FATAL_ON_CURVES" );
 }
 
 if( po.numOptSet( "all-warnings" ) )
 {
 OPTION_APPEND( "VERBOSE_CGM_WARNINGS" );
 }
 
 // This is more roundabout than necessary, but we don't want *any* of the CGM-specific options
 // to appear in the option string unless they were explicitly requested
 double tol;
 static const int tol_prec = 12;
 if( po.getOpt( "ftol", &tol ) )
 {
 std::stringstream s;
 s << "FACET_DISTANCE_TOLERANCE=" << std::setprecision( tol_prec ) << tol;
 OPTION_APPEND( s.str() );
 }
 
 if( po.getOpt( "ltol", &tol ) )
 {
 std::stringstream s;
 s << "MAX_FACET_EDGE_LENGTH=" << std::setprecision( tol_prec ) << tol;
 OPTION_APPEND( s.str() );
 }
 
 int atol;
 if( po.getOpt( "atol", &atol ) )
 {
 std::stringstream s;
 s << "FACET_NORMAL_TOLERANCE=" << atol;
 OPTION_APPEND( s.str() );
 }
 
#undef OPTION_APPEND
 
 /* Load main input file */
 if( verbose )
 {
 std::cout << "Loading file " << input_file << std::endl;
 if( options.length() ) std::cout << "Option string: " << options << std::endl;
 }
 
 EntityHandle input_file_set;
 ErrorCode ret;
 Core mbi;
 
 ret = mbi.create_meshset( 0, input_file_set );
 CHECKERR( mbi, ret );
 
 ret = mbi.load_file( input_file.c_str(), &input_file_set, options.c_str() );
 if( ret == MB_UNHANDLED_OPTION )
 {
 std::cerr << "Warning: unhandled option while loading input_file, will proceed anyway" << std::endl;
 }
 else
 {
 CHECKERR( mbi, ret );
 }
 
 /* Iterate through any -m alternate mesh files and replace surfaces */
 
 std::vector< std::string > m_list;
 po.getOptAllArgs( ",m", m_list );
 
 if( m_list.size() > 0 )
 {
 
 if( obb_task )
 {
 std::cerr << "Warning: using obb features in conjunction with -m may not work correctly!" << std::endl;
 }
 
 // Create tags
 Tag dimTag, idTag, senseTag;
 ret = mbi.tag_get_handle( GEOM_DIMENSION_TAG_NAME, 1, MB_TYPE_INTEGER, dimTag, MB_TAG_SPARSE | MB_TAG_CREAT );
 CHECKERR( mbi, ret );
 
 idTag = mbi.globalId_tag();
 
 ret = mbi.tag_get_handle( "GEOM_SENSE_2", 2, MB_TYPE_HANDLE, senseTag, MB_TAG_SPARSE | MB_TAG_CREAT );
 CHECKERR( mbi, ret );
 
 for( std::vector< std::string >::iterator i = m_list.begin(); i != m_list.end(); ++i )
 {
 std::cout << "Loading alternate mesh file " << *i << std::endl;
 
 EntityHandle alt_file_set;
 ret = mbi.create_meshset( 0, alt_file_set );
 CHECKERR( mbi, ret );
 
 ret = mbi.load_file( ( *i ).c_str(), &alt_file_set );
 CHECKERR( mbi, ret );
 
 if( verbose ) std::cout << "Merging input surfaces..." << std::flush;
 
 ret = merge_input_surfs( &mbi, input_file_set, alt_file_set, idTag, dimTag, senseTag );
 CHECKERR( mbi, ret );
 
 if( verbose ) std::cout << "done." << std::endl;
 }
 }
 
 /* Write output file */
 
 if( !po.numOptSet( "no-outmesh" ) )
 {
 if( verbose )
 {
 std::cout << "Writing " << output_file << std::endl;
 }
 ret = mbi.write_file( output_file.c_str(), NULL, NULL, &input_file_set, 1 );
 CHECKERR( mbi, ret );
 }
 
 /* OBB statistics and visualization */
 if( obb_task )
 {
 
 if( verbose )
 {
 std::cout << "Loading data into GeomTopoTool" << std::endl;
 }
 GeomTopoTool* gtt = new GeomTopoTool( &mbi, false );
 ret = gtt->find_geomsets();
 CHECKERR( *gtt, ret );
 ret = gtt->construct_obb_trees();
 CHECKERR( *gtt, ret );
 }
 return 0;
}