GeomTopoTool.cpp

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/**
 * MOAB, a Mesh-Oriented datABase, is a software component for creating,
 * storing and accessing finite element mesh data.
 *
 * Copyright 2004 Sandia Corporation.  Under the terms of Contract
 * DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government
 * retains certain rights in this software.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 */

#include "moab/GeomTopoTool.hpp"
#include "moab/GeomQueryTool.hpp"
#include "moab/OrientedBoxTreeTool.hpp"
#include "moab/Range.hpp"
#include "MBTagConventions.hpp"
#include "moab/Interface.hpp"
#include "moab/CN.hpp"
#include "moab/Skinner.hpp"
#include "Internals.hpp"
#include <iostream>

namespace moab
{

// Tag name used for saving sense of faces in volumes.
// We assume that the surface occurs in at most two volumes.
// Code will error out if more than two volumes per surface.
// The tag data is a pair of tag handles, representing the
// forward and reverse volumes, respectively.  If a surface
// is non-manifold in a single volume, the same volume will
// be listed for both the forward and reverse slots.
const char GEOM_SENSE_2_TAG_NAME[] = "GEOM_SENSE_2";

const char GEOM_SENSE_N_ENTS_TAG_NAME[]   = "GEOM_SENSE_N_ENTS";
const char GEOM_SENSE_N_SENSES_TAG_NAME[] = "GEOM_SENSE_N_SENSES";
const char OBB_ROOT_TAG_NAME[]            = "OBB_ROOT";
const char OBB_GSET_TAG_NAME[]            = "OBB_GSET";

const char IMPLICIT_COMPLEMENT_NAME[] = "impl_complement";

GeomTopoTool::GeomTopoTool( Interface* impl, bool find_geoments, EntityHandle modelRootSet, bool p_rootSets_vector,
                            bool restore_rootSets )
    : mdbImpl( impl ), sense2Tag( 0 ), senseNEntsTag( 0 ), senseNSensesTag( 0 ), geomTag( 0 ), gidTag( 0 ),
      obbRootTag( 0 ), obbGsetTag( 0 ), modelSet( modelRootSet ), updated( false ), setOffset( 0 ),
      m_rootSets_vector( p_rootSets_vector ), oneVolRootSet( 0 )
{

    obbTree = new OrientedBoxTreeTool( impl, NULL, true );

    ErrorCode rval =
        mdbImpl->tag_get_handle( GEOM_DIMENSION_TAG_NAME, 1, MB_TYPE_INTEGER, geomTag, MB_TAG_CREAT | MB_TAG_SPARSE );MB_CHK_SET_ERR_CONT( rval, "Error: Failed to create geometry dimension tag" );

    // global id tag is not really needed, but mbsize complains if we do not set it for
    // geometry entities
    gidTag = mdbImpl->globalId_tag();

    rval =
        mdbImpl->tag_get_handle( NAME_TAG_NAME, NAME_TAG_SIZE, MB_TYPE_OPAQUE, nameTag, MB_TAG_CREAT | MB_TAG_SPARSE );MB_CHK_SET_ERR_CONT( rval, "Error: Failed to create name tag" );

    rval = mdbImpl->tag_get_handle( OBB_ROOT_TAG_NAME, 1, MB_TYPE_HANDLE, obbRootTag, MB_TAG_CREAT | MB_TAG_SPARSE );MB_CHK_SET_ERR_CONT( rval, "Error: Failed to create obb root tag" );

    rval = mdbImpl->tag_get_handle( OBB_GSET_TAG_NAME, 1, MB_TYPE_HANDLE, obbGsetTag, MB_TAG_CREAT | MB_TAG_SPARSE );MB_CHK_SET_ERR_CONT( rval, "Error: Failed to create obb gset tag" );

    // set this value to zero for comparisons
    impl_compl_handle = 0;

    maxGlobalId[0] = maxGlobalId[1] = maxGlobalId[2] = maxGlobalId[3] = maxGlobalId[4] = 0;
    if( find_geoments )
    {
        find_geomsets();
        if( restore_rootSets )
        {
            rval = restore_obb_index();
            if( MB_SUCCESS != rval )
            {
                rval = delete_all_obb_trees();MB_CHK_SET_ERR_CONT( rval, "Error: Failed to delete existing obb trees" );
                rval = construct_obb_trees();MB_CHK_SET_ERR_CONT( rval, "Error: Failed to rebuild obb trees" );
            }
        }
    }
}

GeomTopoTool::~GeomTopoTool()
{
    delete obbTree;
}

int GeomTopoTool::dimension( EntityHandle this_set )
{
    ErrorCode result;
    if( 0 == geomTag )
    {
        result = mdbImpl->tag_get_handle( GEOM_DIMENSION_TAG_NAME, 1, MB_TYPE_INTEGER, geomTag );MB_CHK_SET_ERR( result, "Failed to get the geometry dimension tag" );
    }

    // check if the geo set belongs to this model
    if( modelSet )
    {
        if( !mdbImpl->contains_entities( modelSet, &this_set, 1 ) )
        {
            // this g set does not belong to the current model
            return -1;
        }
    }
    // get the data for those tags
    int dim;
    result = mdbImpl->tag_get_data( geomTag, &this_set, 1, &dim );
    if( MB_SUCCESS != result ) return -1;
    return dim;
}

int GeomTopoTool::global_id( EntityHandle this_set )
{
    ErrorCode result;
    if( 0 == gidTag ) { gidTag = mdbImpl->globalId_tag(); }

    // check if the geo set belongs to this model
    if( modelSet )
    {
        if( !mdbImpl->contains_entities( modelSet, &this_set, 1 ) )
        {
            // this g set does not belong to the current model
            return -1;
        }
    }

    // get the data for those tags
    int id;
    result = mdbImpl->tag_get_data( gidTag, &this_set, 1, &id );
    if( MB_SUCCESS != result ) return -1;
    return id;
}

EntityHandle GeomTopoTool::entity_by_id( int dimension1, int id )
{
    if( 0 > dimension1 && 3 < dimension1 ) { MB_CHK_SET_ERR_CONT( MB_FAILURE, "Incorrect dimension provided" ); };
    const Tag tags[]         = { gidTag, geomTag };
    const void* const vals[] = { &id, &dimension1 };
    ErrorCode rval;

    Range results;
    rval = mdbImpl->get_entities_by_type_and_tag( 0, MBENTITYSET, tags, vals, 2, results );

    if( MB_SUCCESS != rval ) return 0;

    return results.front();
}

ErrorCode GeomTopoTool::other_entity( EntityHandle bounded, EntityHandle not_this, EntityHandle across,
                                      EntityHandle& other )
{
    other = 0;

    // get all children of bounded
    Range bdy, tmpr;
    ErrorCode rval = mdbImpl->get_child_meshsets( bounded, bdy );MB_CHK_SET_ERR( rval, "Failed to get the bounded entity's child meshsets" );

    // get all the parents of across
    rval = mdbImpl->get_parent_meshsets( across, tmpr );

    // possible candidates is the intersection
    bdy = intersect( bdy, tmpr );

    // if only two, choose the other
    if( 1 == bdy.size() && *bdy.begin() == not_this ) { return MB_SUCCESS; }
    else if( 2 == bdy.size() )
    {
        if( *bdy.begin() == not_this ) other = *bdy.rbegin();
        if( *bdy.rbegin() == not_this )
            other = *bdy.begin();
        else
            return MB_FAILURE;
    }
    else
    {
        return MB_FAILURE;
    }

    return MB_SUCCESS;
}

ErrorCode GeomTopoTool::restore_obb_index()
{

    if( m_rootSets_vector ) resize_rootSets();

    ErrorCode rval;
    EntityHandle root;

    for( int dim = 2; dim <= 3; dim++ )
        for( Range::iterator rit = geomRanges[dim].begin(); rit != geomRanges[dim].end(); ++rit )
        {
            rval = mdbImpl->tag_get_data( obbRootTag, &( *rit ), 1, &root );

            if( MB_SUCCESS == rval )
                set_root_set( *rit, root );
            else
            {
                return MB_TAG_NOT_FOUND;
            }
        }

    return MB_SUCCESS;
}

ErrorCode GeomTopoTool::find_geomsets( Range* ranges )
{
    ErrorCode rval;
    // get all sets with this tag
    Range geom_sets;

    if( 0 == geomTag )
    {
        rval = mdbImpl->tag_get_handle( GEOM_DIMENSION_TAG_NAME, 1, MB_TYPE_INTEGER, geomTag );MB_CHK_SET_ERR( rval, "Failed to get geom dimension tag handle" );
    }

    rval = mdbImpl->get_entities_by_type_and_tag( modelSet, MBENTITYSET, &geomTag, NULL, 1, geom_sets );MB_CHK_SET_ERR( rval, "Failed to get the geometry entities" );

    rval = separate_by_dimension( geom_sets );MB_CHK_SET_ERR( rval, "Failed to separate geometry sets by dimension" );

    if( ranges )
    {
        for( int i = 0; i < 5; i++ )
        {
            ranges[i] = geomRanges[i];
        }
    }

    return MB_SUCCESS;
}

ErrorCode GeomTopoTool::get_gsets_by_dimension( int dim, Range& gset )
{
    ErrorCode rval;

    const int val               = dim;
    const void* const dim_val[] = { &val };
    rval = mdbImpl->get_entities_by_type_and_tag( modelSet, MBENTITYSET, &geomTag, dim_val, 1, gset );MB_CHK_SET_ERR( rval, "Failed to get entity set by type and tag" );

    return MB_SUCCESS;
}

ErrorCode GeomTopoTool::resize_rootSets()
{

    ErrorCode rval;

    // store original offset for later
    EntityHandle orig_offset = setOffset;

    // get all surfaces and volumes
    Range surfs, vols;
    rval = get_gsets_by_dimension( 2, surfs );MB_CHK_SET_ERR( rval, "Could not get surface sets" );
    rval = get_gsets_by_dimension( 3, vols );MB_CHK_SET_ERR( rval, "Could not get volume sets" );

    // check the vector size
    Range surfs_and_vols;
    surfs_and_vols = vols;
    surfs_and_vols.merge( surfs );

    // update the setOffset
    setOffset = surfs_and_vols.front();

    EntityHandle exp_size = surfs_and_vols.back() - setOffset + 1;

    // if new EnitytHandle(s) are lower than the original offset
    if( setOffset < orig_offset )
    {
        // insert empty values at the beginning of the vector
        rootSets.insert( rootSets.begin(), orig_offset - setOffset, 0 );
    }

    if( exp_size != rootSets.size() )
    {
        // resize rootSets vector if necessary (new space will be added at the back)
        rootSets.resize( exp_size );
    }

    return MB_SUCCESS;
}

ErrorCode GeomTopoTool::is_owned_set( EntityHandle eh )
{
    // make sure entity set is part of the model
    Range model_ents;
    ErrorCode rval = mdbImpl->get_entities_by_handle( modelSet, model_ents );MB_CHK_SET_ERR( rval, "Failed to get entities" );
    if( model_ents.find( eh ) == model_ents.end() ) { MB_SET_ERR( MB_FAILURE, "Entity handle not in model set" ); }
    return MB_SUCCESS;
}

ErrorCode GeomTopoTool::delete_obb_tree( EntityHandle gset, bool vol_only )
{

    ErrorCode rval;

    // Make sure this set is part of the model
    rval = is_owned_set( gset );MB_CHK_SET_ERR( rval, "Entity set is not part of this model" );

    // Find the dimension of the entity
    int dim;
    rval = mdbImpl->tag_get_data( geomTag, &gset, 1, &dim );MB_CHK_SET_ERR( rval, "Failed to get dimension" );

    // Attempt to find a root for this set
    EntityHandle root;
    rval = get_root( gset, root );MB_CHK_SET_ERR( rval, "Failed to find an obb tree root for the entity set" );

    // Create range of tree nodes to delete
    Range nodes_to_delete;
    nodes_to_delete.insert( root );

    // If passed ent is a vol and 'vol_only' is true, delete vol root and all nodes between vol and
    // surf root
    if( dim == 3 && vol_only )
    {
        // Range of child nodes to check before adding to delete list
        Range child_tree_nodes;
        rval = mdbImpl->get_child_meshsets( root, child_tree_nodes );MB_CHK_SET_ERR( rval, "Problem getting child tree nodes" );

        // Traverse the tree, checking each child node until
        // a surface root node is reached
        while( child_tree_nodes.size() != 0 )
        {
            EntityHandle child = *child_tree_nodes.begin();
            EntityHandle surf;
            rval = mdbImpl->tag_get_data( obbGsetTag, &child, 1, &surf );
            // If the node has a gset tag, it is a surf root. Stop here.
            // If not, it is a tree node that needs to 1) have its children checked and
            //  2) be added to delete range
            if( MB_TAG_NOT_FOUND == rval )
            {
                Range new_child_tree_nodes;
                rval = mdbImpl->get_child_meshsets( child, new_child_tree_nodes );MB_CHK_SET_ERR( rval, "Problem getting child nodes" );
                child_tree_nodes.insert_list( new_child_tree_nodes.begin(), new_child_tree_nodes.end() );
                nodes_to_delete.insert( child );
            }
            // We're done checking this node, so can erase from child list
            child_tree_nodes.erase( child );
        }
    }
    // If passed ent is a surf or a vol and 'vol_only' is false, recursively gather all child nodes
    // and add them to delete list
    else
    {
        Range all_tree_nodes;
        rval = mdbImpl->get_child_meshsets( root, all_tree_nodes, 0 );MB_CHK_SET_ERR( rval, "Failed to get child tree node sets" );
        nodes_to_delete.insert_list( all_tree_nodes.begin(), all_tree_nodes.end() );
    }

    // Remove the root nodes from the GTT data structures
    for( Range::iterator it = nodes_to_delete.begin(); it != nodes_to_delete.end(); ++it )
    {
        // Check to see if node is a root
        EntityHandle vol_or_surf;
        rval = mdbImpl->tag_get_data( obbGsetTag, &( *it ), 1, &vol_or_surf );
        if( MB_SUCCESS == rval )
        {
            // Remove from set of all roots
            rval = remove_root( vol_or_surf );MB_CHK_SET_ERR( rval, "Failed to remove node from GTT data structure" );
        }
    }

    // Delete the tree nodes from the database
    rval = mdbImpl->delete_entities( nodes_to_delete );MB_CHK_SET_ERR( rval, "Failed to delete node set" );

    return MB_SUCCESS;
}

ErrorCode GeomTopoTool::delete_all_obb_trees()
{

    ErrorCode rval;

    for( Range::iterator rit = geomRanges[3].begin(); rit != geomRanges[3].end(); ++rit )
    {
        EntityHandle root;
        rval = mdbImpl->tag_get_data( obbRootTag, &( *rit ), 1, &root );
        if( MB_SUCCESS == rval )
        {
            rval = delete_obb_tree( *rit, false );MB_CHK_SET_ERR( rval, "Failed to delete obb tree" );
        }
    }

    return MB_SUCCESS;
}

ErrorCode GeomTopoTool::construct_obb_tree( EntityHandle eh )
{
    ErrorCode rval;
    int dim;

    rval = is_owned_set( eh );MB_CHK_SET_ERR( rval, "Entity set is not part of this model" );

    // get the type
    EntityType type = mdbImpl->type_from_handle( eh );

    // find the dimension of the entity
    rval = mdbImpl->tag_get_data( geomTag, &eh, 1, &dim );MB_CHK_SET_ERR( rval, "Failed to get dimension" );

    // ensure that the rootSets vector is of the correct size
    if( m_rootSets_vector && ( eh < setOffset || eh >= setOffset + rootSets.size() ) )
    {
        rval = resize_rootSets();MB_CHK_SET_ERR( rval, "Error setting offset and sizing rootSets vector." );
    }

    EntityHandle root;
    // if it's a surface
    if( dim == 2 && type == MBENTITYSET )
    {
        rval = get_root( eh, root );
        if( MB_SUCCESS == rval )
        {
            std::cerr << "Surface obb tree already exists" << std::endl;
            return MB_SUCCESS;
        }
        else if( MB_INDEX_OUT_OF_RANGE != rval )
        {
            MB_CHK_SET_ERR( rval, "Failed to get surface obb tree root" );
        }

        Range tris;
        rval = mdbImpl->get_entities_by_dimension( eh, 2, tris );MB_CHK_SET_ERR( rval, "Failed to get entities by dimension" );

        if( tris.empty() ) { std::cerr << "WARNING: Surface has no facets" << std::endl; }

        rval = obbTree->build( tris, root );MB_CHK_SET_ERR( rval, "Failed to build obb Tree for surface" );

        rval = mdbImpl->add_entities( root, &eh, 1 );MB_CHK_SET_ERR( rval, "Failed to add entities to root set" );

        // add this root to the GeomTopoTool tree root indexing
        set_root_set( eh, root );

        // if just building tree for surface, return here
        return MB_SUCCESS;
    }
    // if it's a volume
    else if( dim == 3 && type == MBENTITYSET )
    {
        // get its surfaces
        Range tmp_surfs, surf_trees;
        rval = mdbImpl->get_child_meshsets( eh, tmp_surfs );MB_CHK_SET_ERR( rval, "Failed to get surface meshsets" );

        // get OBB trees or create for each surface
        for( Range::iterator j = tmp_surfs.begin(); j != tmp_surfs.end(); ++j )
        {
            rval = get_root( *j, root );
            // if root doesn't exist, create obb tree
            if( MB_INDEX_OUT_OF_RANGE == rval )
            {
                rval = construct_obb_tree( *j );MB_CHK_SET_ERR( rval, "Failed to get create surface obb tree" );
                rval = get_root( *j, root );MB_CHK_SET_ERR( rval, "Failed to get surface obb tree root" );
            }
            else
            {
                MB_CHK_SET_ERR( rval, "Failed to get surface obb tree root" );
            }

            surf_trees.insert( root );
        }

        // build OBB tree for volume
        rval = obbTree->join_trees( surf_trees, root );MB_CHK_SET_ERR( rval, "Failed to join the obb trees" );

        // add this root to the GeomTopoTool tree root indexing
        set_root_set( eh, root );

        return MB_SUCCESS;
    }
    else
    {
        MB_SET_ERR( MB_FAILURE, "Improper dimension or type for constructing obb tree" );
    }
}

ErrorCode GeomTopoTool::set_root_set( EntityHandle vol_or_surf, EntityHandle root )
{

    // Tag the vol or surf with its obb root (obbRootTag)
    ErrorCode rval;
    rval = mdbImpl->tag_set_data( obbRootTag, &vol_or_surf, 1, &root );MB_CHK_SET_ERR( rval, "Failed to set the obb root tag" );

    // Tag obb root with corresponding gset (obbGsetTag)
    rval = mdbImpl->tag_set_data( obbGsetTag, &root, 1, &vol_or_surf );MB_CHK_SET_ERR( rval, "Failed to set the obb gset tag" );

    // Add to the set of all roots
    if( m_rootSets_vector )
        rootSets[vol_or_surf - setOffset] = root;
    else
        mapRootSets[vol_or_surf] = root;

    return MB_SUCCESS;
}

ErrorCode GeomTopoTool::remove_root( EntityHandle vol_or_surf )
{

    // Find the root of the vol or surf
    ErrorCode rval;
    EntityHandle root;
    rval = mdbImpl->tag_get_data( obbRootTag, &( vol_or_surf ), 1, &root );MB_CHK_SET_ERR( rval, "Failed to get obb root tag" );

    // If the ent is a vol, remove its root from obbtreetool
    int dim;
    rval = mdbImpl->tag_get_data( geomTag, &vol_or_surf, 1, &dim );MB_CHK_SET_ERR( rval, "Failed to get dimension" );
    if( dim == 3 )
    {
        rval = obbTree->remove_root( root );MB_CHK_SET_ERR( rval, "Failed to remove root from obbTreeTool" );
    }

    // Delete the obbGsetTag data from the root
    rval = mdbImpl->tag_delete_data( obbGsetTag, &root, 1 );MB_CHK_SET_ERR( rval, "Failed to delete obb root tag" );

    // Delete the obbRootTag data from the vol or surf
    rval = mdbImpl->tag_delete_data( obbRootTag, &vol_or_surf, 1 );MB_CHK_SET_ERR( rval, "Failed to delete obb root tag" );

    // Remove the root from set of all roots
    if( m_rootSets_vector )
    {
        unsigned int index = vol_or_surf - setOffset;
        if( index < rootSets.size() ) { rootSets[index] = 0; }
        else
        {
            return MB_INDEX_OUT_OF_RANGE;
        }
    }
    else
    {
        mapRootSets[vol_or_surf] = 0;
    }

    return MB_SUCCESS;
}

ErrorCode GeomTopoTool::construct_obb_trees( bool make_one_vol )
{
    ErrorCode rval;
    EntityHandle root;

    // get all surfaces and volumes
    Range surfs, vols, vol_trees;
    rval = get_gsets_by_dimension( 2, surfs );MB_CHK_SET_ERR( rval, "Could not get surface sets" );
    rval = get_gsets_by_dimension( 3, vols );MB_CHK_SET_ERR( rval, "Could not get volume sets" );

    // for surface
    Range one_vol_trees;
    for( Range::iterator i = surfs.begin(); i != surfs.end(); ++i )
    {
        rval = construct_obb_tree( *i );MB_CHK_SET_ERR( rval, "Failed to construct obb tree for surface" );
        // get the root set of this volume
        rval = get_root( *i, root );MB_CHK_SET_ERR( rval, "Failed to get obb tree root for surface" );
        // add to the Range of volume root sets
        one_vol_trees.insert( root );
    }

    // for volumes
    for( Range::iterator i = vols.begin(); i != vols.end(); ++i )
    {
        // create tree for this volume
        rval = construct_obb_tree( *i );MB_CHK_SET_ERR( rval, "Failed to construct obb tree for volume" );
    }

    // build OBB tree for volume
    if( make_one_vol )
    {
        rval = obbTree->join_trees( one_vol_trees, root );MB_CHK_SET_ERR( rval, "Failed to join surface trees into one volume" );
        oneVolRootSet = root;
    }

    return rval;
}

//! Restore parent/child links between GEOM_TOPO mesh sets
ErrorCode GeomTopoTool::restore_topology_from_adjacency()
{

    // look for geometric topology sets and restore parent/child links between them
    // algorithm:
    // - for each entity of dimension d=D-1..0:
    //   . get d-dimensional entity in entity
    //   . get all (d+1)-dim adjs to that entity
    //   . for each geom entity if dim d+1, if it contains any of the ents,
    //     add it to list of parents
    //   . make parent/child links with parents

    // the  geomRanges are already known, separated by dimension

    std::vector< EntityHandle > parents;
    Range tmp_parents;
    ErrorCode result;

    // loop over dimensions
    for( int dim = 2; dim >= 0; dim-- )
    {
        // mark entities of next higher dimension with their owners; regenerate tag
        // each dimension so prev dim's tag data goes away
        Tag owner_tag;
        EntityHandle dum_val = 0;
        result = mdbImpl->tag_get_handle( "__owner_tag", 1, MB_TYPE_HANDLE, owner_tag, MB_TAG_DENSE | MB_TAG_CREAT,
                                          &dum_val );
        if( MB_SUCCESS != result ) continue;
        Range dp1ents;
        std::vector< EntityHandle > owners;
        for( Range::iterator rit = geomRanges[dim + 1].begin(); rit != geomRanges[dim + 1].end(); ++rit )
        {
            dp1ents.clear();
            result = mdbImpl->get_entities_by_dimension( *rit, dim + 1, dp1ents );
            if( MB_SUCCESS != result ) continue;
            owners.resize( dp1ents.size() );
            std::fill( owners.begin(), owners.end(), *rit );
            result = mdbImpl->tag_set_data( owner_tag, dp1ents, &owners[0] );
            if( MB_SUCCESS != result ) continue;
        }

        for( Range::iterator d_it = geomRanges[dim].begin(); d_it != geomRanges[dim].end(); ++d_it )
        {
            Range dents;
            result = mdbImpl->get_entities_by_dimension( *d_it, dim, dents );
            if( MB_SUCCESS != result ) continue;
            if( dents.empty() ) continue;

            // get (d+1)-dimensional adjs
            dp1ents.clear();
            result = mdbImpl->get_adjacencies( &( *dents.begin() ), 1, dim + 1, false, dp1ents );
            if( MB_SUCCESS != result || dp1ents.empty() ) continue;

            // get owner tags
            parents.resize( dp1ents.size() );
            result = mdbImpl->tag_get_data( owner_tag, dp1ents, &parents[0] );
            if( MB_TAG_NOT_FOUND == result ) { MB_CHK_SET_ERR( result, "Could not find owner tag" ); }
            if( MB_SUCCESS != result ) continue;

            // compress to a range to remove duplicates
            tmp_parents.clear();
            std::copy( parents.begin(), parents.end(), range_inserter( tmp_parents ) );
            for( Range::iterator pit = tmp_parents.begin(); pit != tmp_parents.end(); ++pit )
            {
                result = mdbImpl->add_parent_child( *pit, *d_it );MB_CHK_SET_ERR( result, "Failed to create parent child relationship" );
            }

            // store surface senses within regions, and edge senses within surfaces
            if( dim == 0 ) continue;
            const EntityHandle *conn3 = NULL, *conn2 = NULL;
            int len3 = 0, len2 = 0, err = 0, num = 0, sense = 0, offset = 0;
            for( size_t i = 0; i < parents.size(); ++i )
            {
                result = mdbImpl->get_connectivity( dp1ents[i], conn3, len3, true );MB_CHK_SET_ERR( result, "Failed to get the connectivity of the element" );
                result = mdbImpl->get_connectivity( dents.front(), conn2, len2, true );MB_CHK_SET_ERR( result, "Failed to get the connectivity of the first element" );
                if( len2 > 4 ) { MB_SET_ERR( MB_FAILURE, "Connectivity of incorrect length" ); }
                err = CN::SideNumber( TYPE_FROM_HANDLE( dp1ents[i] ), conn3, conn2, len2, dim, num, sense, offset );
                if( err ) return MB_FAILURE;

                result = set_sense( *d_it, parents[i], sense );
                if( MB_MULTIPLE_ENTITIES_FOUND == result )
                {
                    if( 2 == dim )
                        std::cerr << "Warning: Multiple volumes use surface with same sense." << std::endl
                                  << "         Some geometric sense data lost." << std::endl;
                }
                else if( MB_SUCCESS != result )
                {
                    return result;
                }
            }
        }

        // now delete owner tag on this dimension, automatically removes tag data
        result = mdbImpl->tag_delete( owner_tag );MB_CHK_SET_ERR( result, "Failed to delete the owner tag" );

    }  // dim

    return result;
}

ErrorCode GeomTopoTool::separate_by_dimension( const Range& geom_sets )
{
    ErrorCode result;

    result = check_geom_tag();MB_CHK_SET_ERR( result, "Could not verify geometry dimension tag" );

    // get the data for those tags
    std::vector< int > tag_vals( geom_sets.size() );
    result = mdbImpl->tag_get_data( geomTag, geom_sets, &tag_vals[0] );MB_CHK_SET_ERR( result, "Failed to get the geometry dimension tag" );

    Range::const_iterator git;
    std::vector< int >::iterator iit;

    for( int i = 0; i < 5; i++ )
        this->geomRanges[i].clear();

    for( git = geom_sets.begin(), iit = tag_vals.begin(); git != geom_sets.end(); ++git, ++iit )
    {
        if( 0 <= *iit && 4 >= *iit )
            geomRanges[*iit].insert( *git );
        else
        {
            // assert(false);
            // do nothing for now
        }
    }

    // establish the max global ids so far, per dimension
    if( 0 == gidTag ) { gidTag = mdbImpl->globalId_tag(); }

    for( int i = 0; i <= 4; i++ )
    {
        maxGlobalId[i] = 0;
        for( Range::iterator it = geomRanges[i].begin(); it != geomRanges[i].end(); ++it )
        {
            EntityHandle set = *it;
            int gid;

            result = mdbImpl->tag_get_data( gidTag, &set, 1, &gid );
            if( MB_SUCCESS == result )
            {
                if( gid > maxGlobalId[i] ) maxGlobalId[i] = gid;
            }
        }
    }

    return MB_SUCCESS;
}

ErrorCode GeomTopoTool::construct_vertex_ranges( const Range& geom_sets, const Tag verts_tag )
{
    // construct the vertex range for each entity and put on that tag
    Range *temp_verts, temp_elems;
    ErrorCode result = MB_SUCCESS;
    for( Range::const_iterator it = geom_sets.begin(); it != geom_sets.end(); ++it )
    {
        temp_elems.clear();

        // get all the elements in the set, recursively
        result = mdbImpl->get_entities_by_handle( *it, temp_elems, true );MB_CHK_SET_ERR( result, "Failed to get the geometry set entities" );

        // make the new range
        temp_verts = new( std::nothrow ) Range();
        if( NULL == temp_verts ) { MB_SET_ERR( MB_FAILURE, "Could not construct Range object" ); }

        // get all the verts of those elements; use get_adjacencies 'cuz it handles ranges better
        result = mdbImpl->get_adjacencies( temp_elems, 0, false, *temp_verts, Interface::UNION );
        if( MB_SUCCESS != result ) { delete temp_verts; }
        MB_CHK_SET_ERR( result, "Failed to get the element's adjacent vertices" );

        // store this range as a tag on the entity
        result = mdbImpl->tag_set_data( verts_tag, &( *it ), 1, &temp_verts );
        if( MB_SUCCESS != result ) { delete temp_verts; }
        MB_CHK_SET_ERR( result, "Failed to get the adjacent vertex data" );

        delete temp_verts;
        temp_verts = NULL;
    }

    return result;
}

//! Store sense of entity relative to wrt_entity.
//!\return MB_MULTIPLE_ENTITIES_FOUND if surface already has a forward volume.
//!        MB_SUCCESS if successful
//!        otherwise whatever internal error code occurred.
ErrorCode GeomTopoTool::set_sense( EntityHandle entity, EntityHandle wrt_entity, int sense )
{
    // entity is lower dim (edge or face), wrt_entity is face or volume
    int edim   = dimension( entity );
    int wrtdim = dimension( wrt_entity );
    if( -1 == edim || -1 == wrtdim ) MB_SET_ERR( MB_FAILURE, "Non-geometric entity provided" );
    if( wrtdim - edim != 1 ) MB_SET_ERR( MB_FAILURE, "Entity dimension mismatch" );
    if( sense < -1 || sense > 1 ) MB_SET_ERR( MB_FAILURE, "Invalid sense data provided" );

    ErrorCode rval;

    if( 1 == edim )
    {
        // this case is about setting the sense of an edge in a face
        // it could be -1, 0 (rare, non manifold), or 1
        rval = check_edge_sense_tags( true );MB_CHK_SET_ERR( rval, "Failed to check the curve to surface sense tag handles" );
        std::vector< EntityHandle > higher_ents;
        std::vector< int > senses;
        rval = get_senses( entity, higher_ents, senses );  // the tags should be defined here
        // if there are no higher_ents, we are fine, we will just set them
        // if wrt_entity is not among higher_ents, we will add it to the list
        // it is possible the entity (edge set) has no prior faces adjancent; in that case, the
        // tag would not be set, and rval could be MB_TAG_NOT_FOUND; it is not a fatal error
        if( MB_SUCCESS != rval && MB_TAG_NOT_FOUND != rval )
            MB_CHK_SET_ERR( rval, "cannot determine sense tags for edge" );
        bool append = true;
        if( !higher_ents.empty() )
        {
            std::vector< EntityHandle >::iterator it = std::find( higher_ents.begin(), higher_ents.end(), wrt_entity );
            if( it != higher_ents.end() )
            {
                // we should not reset the sense, if the sense is the same
                // if the sense is different, put BOTH
                unsigned int idx = it - higher_ents.begin();
                int oldSense     = senses[idx];
                if( oldSense == sense ) return MB_SUCCESS;  // sense already set fine, do not reset
                if( 0 != oldSense && oldSense + sense != 0 ) return MB_MULTIPLE_ENTITIES_FOUND;
                senses[idx] = SENSE_BOTH;  // allow double senses
                // do not need to add a new sense, but still need to reset the tag
                // because of a new value
                append = false;
            }
        }
        if( append )
        {
            // what happens if a var tag data was already set before, and now it is
            // reset with a different size??
            higher_ents.push_back( wrt_entity );
            senses.push_back( sense );
        }
        // finally, set the senses :
        int dum_size  = higher_ents.size();
        void* dum_ptr = &higher_ents[0];
        rval          = mdbImpl->tag_set_by_ptr( senseNEntsTag, &entity, 1, &dum_ptr, &dum_size );MB_CHK_SET_ERR( rval, "Failed to set the sense data" );

        dum_ptr  = &senses[0];
        dum_size = higher_ents.size();
        rval     = mdbImpl->tag_set_by_ptr( senseNSensesTag, &entity, 1, &dum_ptr, &dum_size );MB_CHK_SET_ERR( rval, "Failed to set the sense data by pointer" );
    }
    else
    {
        // this case is about a face in the volume
        // there could be only 2 volumes

        rval = check_face_sense_tag( true );MB_CHK_SET_ERR( rval, "Failed to verify the face sense tag" );

        EntityHandle sense_data[2] = { 0, 0 };
        rval                       = mdbImpl->tag_get_data( sense2Tag, &entity, 1, sense_data );
        if( MB_TAG_NOT_FOUND != rval && MB_SUCCESS != rval ) MB_CHK_SET_ERR( rval, "Failed to get the sense2Tag data" );

        if( 0 == sense )
        {
            if( 0 != sense_data[0] && wrt_entity != sense_data[0] ) return MB_MULTIPLE_ENTITIES_FOUND;
            if( 0 != sense_data[1] && wrt_entity != sense_data[1] ) return MB_MULTIPLE_ENTITIES_FOUND;
            sense_data[0] = sense_data[1] = wrt_entity;
        }
        else if( -1 == sense )
        {
            if( 0 != sense_data[1] && wrt_entity != sense_data[1] ) return MB_MULTIPLE_ENTITIES_FOUND;
            if( sense_data[1] == wrt_entity ) return MB_SUCCESS;  // already set as we want
            sense_data[1] = wrt_entity;
        }
        else if( 1 == sense )
        {
            if( 0 != sense_data[0] && wrt_entity != sense_data[0] ) return MB_MULTIPLE_ENTITIES_FOUND;
            if( sense_data[0] == wrt_entity ) return MB_SUCCESS;  // already set as we want
            sense_data[0] = wrt_entity;
        }
        return mdbImpl->tag_set_data( sense2Tag, &entity, 1, sense_data );
    }
    return MB_SUCCESS;
}

//! Get the sense of entity with respect to wrt_entity
//! Returns MB_ENTITY_NOT_FOUND if no relationship found
ErrorCode GeomTopoTool::get_sense( EntityHandle entity, EntityHandle wrt_entity, int& sense )
{
    // entity is lower dim (edge or face), wrt_entity is face or volume
    int edim   = dimension( entity );
    int wrtdim = dimension( wrt_entity );
    if( -1 == edim || -1 == wrtdim ) MB_SET_ERR( MB_FAILURE, "Non-geometric entity provided" );
    if( wrtdim - edim != 1 ) MB_SET_ERR( MB_FAILURE, "Entity dimension mismatch" );

    ErrorCode rval;

    if( 1 == edim )
    {
        // edge in face
        rval = check_edge_sense_tags( false );MB_CHK_SET_ERR( rval, "Failed to check the curve to surface sense tag handles" );

        std::vector< EntityHandle > faces;
        std::vector< int > senses;
        rval = get_senses( entity, faces, senses );  // the tags should be defined here
        MB_CHK_SET_ERR( rval, "Failed to get the curve to surface sense data" );

        std::vector< EntityHandle >::iterator it = std::find( faces.begin(), faces.end(), wrt_entity );
        if( it == faces.end() ) return MB_ENTITY_NOT_FOUND;
        unsigned int index = it - faces.begin();
        sense              = senses[index];
    }
    else
    {
        // face in volume
        rval = check_face_sense_tag( false );MB_CHK_SET_ERR( rval, "Failed to check the surface to volume sense tag handle" );
        EntityHandle sense_data[2] = { 0, 0 };
        rval                       = mdbImpl->tag_get_data( sense2Tag, &entity, 1, sense_data );
        if( MB_TAG_NOT_FOUND != rval && MB_SUCCESS != rval )
            MB_CHK_SET_ERR( rval, "Failed to get the surface to volume sense data" );
        if( ( wrt_entity == sense_data[0] ) && ( wrt_entity == sense_data[1] ) )
            sense = 0;
        else if( wrt_entity == sense_data[0] )
            sense = 1;
        else if( wrt_entity == sense_data[1] )
            sense = -1;
        else
            return MB_ENTITY_NOT_FOUND;
    }
    return MB_SUCCESS;
}

ErrorCode GeomTopoTool::get_surface_senses( EntityHandle surface_ent, EntityHandle& forward_vol,
                                            EntityHandle& reverse_vol )
{
    ErrorCode rval;
    // this method should only be called to retrieve surface to volume
    // sense relationships
    int ent_dim = dimension( surface_ent );
    // verify the incoming entity dimensions for this call
    if( ent_dim != 2 ) { MB_SET_ERR( MB_FAILURE, "Entity dimension is incorrect for surface meshset" ); }

    // get the sense information for this surface
    EntityHandle parent_vols[2] = { 0, 0 };
    rval                        = mdbImpl->tag_get_data( sense2Tag, &surface_ent, 1, parent_vols );MB_CHK_SET_ERR( rval, "Failed to get surface sense data" );

    // set the outgoing values
    forward_vol = parent_vols[0];
    reverse_vol = parent_vols[1];

    return MB_SUCCESS;
}

ErrorCode GeomTopoTool::set_surface_senses( EntityHandle surface_ent, EntityHandle forward_vol,
                                            EntityHandle reverse_vol )
{
    ErrorCode rval;
    // this mthod should only be called to retrieve surface to volume
    // sense relationships
    int ent_dim = dimension( surface_ent );
    // verify the incoming entity dimensions for this call
    if( ent_dim != 2 ) { MB_SET_ERR( MB_FAILURE, "Entity dimension is incorrect for surface meshset" ); }

    // set the sense information for this surface
    EntityHandle parent_vols[2] = { forward_vol, reverse_vol };
    rval                        = mdbImpl->tag_set_data( sense2Tag, &surface_ent, 1, parent_vols );MB_CHK_SET_ERR( rval, "Failed to set surface sense data" );

    return MB_SUCCESS;
}

// get sense of surface(s) wrt volume
ErrorCode GeomTopoTool::get_surface_senses( EntityHandle volume, int num_surfaces, const EntityHandle* surfaces,
                                            int* senses_out )
{

    /* The sense tags do not reference the implicit complement handle.
       All surfaces that interact with the implicit complement should have
       a null handle in the direction of the implicit complement. */
    // if (volume == impl_compl_handle)
    //  volume = (EntityHandle) 0;

    for( int surf_num = 0; surf_num < num_surfaces; surf_num++ )
    {
        get_sense( surfaces[surf_num], volume, senses_out[surf_num] );
    }

    return MB_SUCCESS;
}

ErrorCode GeomTopoTool::get_senses( EntityHandle entity, std::vector< EntityHandle >& wrt_entities,
                                    std::vector< int >& senses )
{
    // the question here is: the wrt_entities is supplied or not?
    // I assume not, we will obtain it !!
    int edim = dimension( entity );

    if( -1 == edim ) MB_SET_ERR( MB_FAILURE, "Non-geometric entity provided" );

    ErrorCode rval;
    wrt_entities.clear();
    senses.clear();

    if( 1 == edim )  // edge
    {
        rval = check_edge_sense_tags( false );MB_CHK_SET_ERR( rval, "Failed to check the curve to surface sense tag handles" );
        const void* dum_ptr;
        int num_ents;
        rval = mdbImpl->tag_get_by_ptr( senseNEntsTag, &entity, 1, &dum_ptr, &num_ents );MB_CHK_ERR( rval );

        const EntityHandle* ents_data = static_cast< const EntityHandle* >( dum_ptr );
        std::copy( ents_data, ents_data + num_ents, std::back_inserter( wrt_entities ) );

        rval = mdbImpl->tag_get_by_ptr( senseNSensesTag, &entity, 1, &dum_ptr, &num_ents );MB_CHK_ERR( rval );

        const int* senses_data = static_cast< const int* >( dum_ptr );
        std::copy( senses_data, senses_data + num_ents, std::back_inserter( senses ) );
    }
    else  // face in volume, edim == 2
    {
        rval = check_face_sense_tag( false );MB_CHK_SET_ERR( rval, "Failed to check the surface to volume sense tag handle" );
        EntityHandle sense_data[2] = { 0, 0 };
        rval                       = mdbImpl->tag_get_data( sense2Tag, &entity, 1, sense_data );MB_CHK_SET_ERR( rval, "Failed to get the surface to volume sense data" );
        if( sense_data[0] != 0 && sense_data[1] == sense_data[0] )
        {
            wrt_entities.push_back( sense_data[0] );
            senses.push_back( 0 );  // both
        }
        else
        {
            if( sense_data[0] != 0 )
            {
                wrt_entities.push_back( sense_data[0] );
                senses.push_back( 1 );
            }
            if( sense_data[1] != 0 )
            {
                wrt_entities.push_back( sense_data[1] );
                senses.push_back( -1 );
            }
        }
    }
    // filter the results with the sets that are in the model at this time
    // this was introduced because extracting some sets (e.g. neumann set, with mbconvert)
    //   from a model would leave some sense tags not defined correctly
    // also, the geom ent set really needs to be part of the current model set
    unsigned int currentSize = 0;

    for( unsigned int index = 0; index < wrt_entities.size(); index++ )
    {
        EntityHandle wrt_ent = wrt_entities[index];
        if( wrt_ent )
        {
            if( mdbImpl->contains_entities( modelSet, &wrt_ent, 1 ) )
            {
                wrt_entities[currentSize] = wrt_entities[index];
                senses[currentSize]       = senses[index];
                currentSize++;
            }
        }
    }
    wrt_entities.resize( currentSize );
    senses.resize( currentSize );
    //
    return MB_SUCCESS;
}

ErrorCode GeomTopoTool::set_senses( EntityHandle entity, std::vector< EntityHandle >& wrt_entities,
                                    std::vector< int >& senses )
{
    // not efficient, and maybe wrong
    for( unsigned int i = 0; i < wrt_entities.size(); i++ )
    {
        ErrorCode rval = set_sense( entity, wrt_entities[i], senses[i] );MB_CHK_SET_ERR( rval, "Failed to set the sense" );
    }

    return MB_SUCCESS;
}

ErrorCode GeomTopoTool::next_vol( EntityHandle surface, EntityHandle old_volume, EntityHandle& new_volume )
{
    std::vector< EntityHandle > parents;
    ErrorCode rval = mdbImpl->get_parent_meshsets( surface, parents );

    if( MB_SUCCESS == rval )
    {
        if( parents.size() != 2 )
            rval = MB_FAILURE;
        else if( parents.front() == old_volume )
            new_volume = parents.back();
        else if( parents.back() == old_volume )
            new_volume = parents.front();
        else
            rval = MB_FAILURE;
    }

    if( rval != MB_SUCCESS )
    {
        std::cerr << "mesh error in next_vol for surf " << surface
                  << std::endl;  // todo: use geomtopotool to get id by entity handle
    }

    return rval;
}

ErrorCode GeomTopoTool::check_geom_tag( bool create )
{
    ErrorCode rval;
    unsigned flags = create ? MB_TAG_DENSE | MB_TAG_CREAT : MB_TAG_DENSE;
    if( !geomTag )
    {
        // get any kind of tag that already exists
        rval = mdbImpl->tag_get_handle( GEOM_DIMENSION_TAG_NAME, 1, MB_TYPE_INTEGER, geomTag, flags );MB_CHK_SET_ERR( rval, "Could not get/create the geometry dimension tag" );
    }
    return MB_SUCCESS;
}

ErrorCode GeomTopoTool::check_gid_tag( bool create )
{
    ErrorCode rval;
    unsigned flags = create ? MB_TAG_DENSE | MB_TAG_CREAT : MB_TAG_DENSE;
    if( !gidTag )
    {
        // get any kind of tag that already exists
        rval = mdbImpl->tag_get_handle( GLOBAL_ID_TAG_NAME, 1, MB_TYPE_INTEGER, gidTag, flags );MB_CHK_SET_ERR( rval, "Could not get/create the global id tag" );
    }
    return MB_SUCCESS;
}

// move the sense tag existence creation in private methods
// verify sense face tag
ErrorCode GeomTopoTool::check_face_sense_tag( bool create )
{
    ErrorCode rval;
    unsigned flags = create ? MB_TAG_SPARSE | MB_TAG_CREAT | MB_TAG_ANY : MB_TAG_SPARSE | MB_TAG_ANY;
    if( !sense2Tag )
    {
        EntityHandle def_val[2] = { 0, 0 };
        rval = mdbImpl->tag_get_handle( GEOM_SENSE_2_TAG_NAME, 2, MB_TYPE_HANDLE, sense2Tag, flags, def_val );MB_CHK_SET_ERR( rval, "Could not get/create the sense2Tag" );
    }
    return MB_SUCCESS;
}

// verify sense edge tags
ErrorCode GeomTopoTool::check_edge_sense_tags( bool create )
{
    ErrorCode rval;
    unsigned flags = MB_TAG_VARLEN | MB_TAG_SPARSE;
    if( create ) flags |= MB_TAG_CREAT;
    if( !senseNEntsTag )
    {
        rval = mdbImpl->tag_get_handle( GEOM_SENSE_N_ENTS_TAG_NAME, 0, MB_TYPE_HANDLE, senseNEntsTag, flags );MB_CHK_SET_ERR( rval, "Failed to get the curve to surface entity tag handle" );
        rval = mdbImpl->tag_get_handle( GEOM_SENSE_N_SENSES_TAG_NAME, 0, MB_TYPE_INTEGER, senseNSensesTag, flags );MB_CHK_SET_ERR( rval, "Failed to get the curve to surface sense tag handle" );
    }
    return MB_SUCCESS;
}

ErrorCode GeomTopoTool::add_geo_set( EntityHandle set, int dim, int gid )
{
    if( dim < 0 || dim > 4 ) MB_SET_ERR( MB_FAILURE, "Invalid geometric dimension provided" );

    // see if it is not already set
    if( geomRanges[dim].find( set ) != geomRanges[dim].end() )
    {
        return MB_SUCCESS;  // nothing to do, we already have it as a geo set of proper dimension
    }
    updated = false;  // this should trigger at least an obb recomputation
    // get the geom topology tag
    ErrorCode result;
    if( 0 == geomTag )
    {
        result = mdbImpl->tag_get_handle( GEOM_DIMENSION_TAG_NAME, 1, MB_TYPE_INTEGER, geomTag );MB_CHK_SET_ERR( result, "Failed to get the geometry dimension tag handle" );
    }

    if( 0 == gidTag ) { gidTag = mdbImpl->globalId_tag(); }

    // make sure the added set has the geom tag properly set
    result = mdbImpl->tag_set_data( geomTag, &set, 1, &dim );MB_CHK_SET_ERR( result, "Failed set the geometry dimension tag value" );

    geomRanges[dim].insert( set );
    // not only that, but also add it to the root model set
    if( modelSet )
    {
        result = mdbImpl->add_entities( modelSet, &set, 1 );MB_CHK_SET_ERR( result, "Failed to add new geometry set to the tool's modelSet" );
    }

    // set the global ID value
    // if passed 0, just increase the max id for the dimension
    if( 0 == gid ) { gid = ++maxGlobalId[dim]; }

    result = mdbImpl->tag_set_data( gidTag, &set, 1, &gid );MB_CHK_SET_ERR( result, "Failed to get the global id tag value for the geom entity" );

    return MB_SUCCESS;
}

// will assume no geo sets are defined for this surface
// will output a mesh_set that contains everything (all sets of interest), for proper output
ErrorCode GeomTopoTool::geometrize_surface_set( EntityHandle surface, EntityHandle& output )
{
    // usual scenario is to read a surface smf file, and "geometrize" it, and output it as a
    //  h5m file with proper sets, tags defined for mesh-based geometry

    // get all triangles/quads from the surface, then build loops
    // we may even have to
    // proper care has to be given to the orientation, material to the left!!!
    // at some point we may have to reorient triangles, not only edges, for proper definition
    bool debugFlag = false;

    Range surface_ents, edge_ents, loop_range;

    // most of these should be triangles and quads
    ErrorCode rval = mdbImpl->get_entities_by_dimension( surface, 2, surface_ents );MB_CHK_SET_ERR( rval, "Failed to get the surface entities" );

    EntityHandle face = surface;
    if( !surface )  // in the case it is root set, create another set
    {
        rval = mdbImpl->create_meshset( MESHSET_SET, face );MB_CHK_SET_ERR( rval, "Failed to create a the new surface meshset" );
    }
    // set the geo tag
    rval = add_geo_set( face, 2 );MB_CHK_SET_ERR( rval, "Failed to add the geometry set to the tool" );

    // this will be our output set, will contain all our new geo sets
    rval = mdbImpl->create_meshset( MESHSET_SET, output );MB_CHK_SET_ERR( rval, "Failed to create the output meshset" );

    // add first geo set (face) to the output set
    rval = mdbImpl->add_entities( output, &face, 1 );MB_CHK_SET_ERR( rval, "Failed to add the new meshset to the output meshset" );

    // how many edges do we need to create?
    // depends on how many loops we have
    // also, we should avoid non-manifold topology
    if( !surface )
    {  // in this case, surface is root, so we have to add entities
        rval = mdbImpl->add_entities( face, surface_ents );MB_CHK_SET_ERR( rval, "Failed to add surface entities to the surface meshset" );
    }

    Skinner tool( mdbImpl );
    rval = tool.find_skin( 0, surface_ents, 1, edge_ents );MB_CHK_SET_ERR( rval, "Failed to skin the surface entities" );
    if( debugFlag )
    {
        std::cout << "skinning edges: " << edge_ents.size() << "\n";
        for( Range::iterator it = edge_ents.begin(); it != edge_ents.end(); ++it )
        {
            EntityHandle ed = *it;
            std::cout << "edge: " << mdbImpl->id_from_handle( ed ) << " type:" << mdbImpl->type_from_handle( ed )
                      << "\n";
            std::cout << mdbImpl->list_entity( ed );
        }
    }

    std::vector< EntityHandle > edges_loop;

    Range pool_of_edges = edge_ents;
    Range used_edges;  // these edges are already used for some loops
    // get a new one

    while( !pool_of_edges.empty() )
    {
        // get the first edge, and start a loop with it
        EntityHandle current_edge = pool_of_edges[0];
        if( debugFlag )
        {
            std::cout << "Start current edge: " << mdbImpl->id_from_handle( current_edge ) << "\n ";
            std::cout << mdbImpl->list_entity( current_edge );
        }
        // get its triangle / quad and see its orientation
        std::vector< EntityHandle > tris;
        rval = mdbImpl->get_adjacencies( &current_edge, 1, 2, false, tris );MB_CHK_SET_ERR( rval, "Failed to get the adjacent triangles to the current edge" );
        if( tris.size() != 1 ) MB_SET_ERR( MB_FAILURE, "Edge not on boundary" );

        int side_n, sense, offset;
        rval = mdbImpl->side_number( tris[0], current_edge, side_n, sense, offset );MB_CHK_SET_ERR( rval, "Failed to get the current edge's side number" );

        const EntityHandle* conn2;
        int nnodes2;
        rval = mdbImpl->get_connectivity( current_edge, conn2, nnodes2 );MB_CHK_SET_ERR( rval, "Failed to get the current edge's connectivity" );

        if( nnodes2 != 2 ) MB_SET_ERR( MB_FAILURE, "Incorrect number of nodes found." );

        EntityHandle start_node = conn2[0];
        EntityHandle next_node  = conn2[1];

        if( sense == -1 )
        {
            // revert the edge, and start well
            EntityHandle nn2[2] = { conn2[1], conn2[0] };
            rval                = mdbImpl->set_connectivity( current_edge, nn2, 2 );MB_CHK_SET_ERR( rval, "Failed to set the connectivity of the current edge" );

            start_node = nn2[0];  // or conn2[0] !!! beware: conn2 is modified
            next_node  = nn2[1];  // or conn2[1]   !!!
            // reset connectivity of edge
            if( debugFlag ) std::cout << " current edge needs reversed\n";
        }
        // start a new loop of edges
        edges_loop.clear();  // every edge loop starts fresh
        edges_loop.push_back( current_edge );
        used_edges.insert( current_edge );
        pool_of_edges.erase( current_edge );

        if( debugFlag )
        {
            std::cout << " start node: " << start_node << "\n";
            std::cout << mdbImpl->list_entity( start_node );
            std::cout << " next node: " << next_node << "\n";
            std::cout << mdbImpl->list_entity( next_node );
        }
        while( next_node != start_node )
        {
            // find the next edge in the skin
            std::vector< EntityHandle > candidate_edges;
            rval = mdbImpl->get_adjacencies( &next_node, 1, 1, false, candidate_edges );MB_CHK_SET_ERR( rval, "Failed to get the adjacent edges to the next node" );
            // filter the edges that are used, or the edges not in the skin
            std::vector< EntityHandle > good_edges;
            for( int k = 0; k < (int)candidate_edges.size(); k++ )
            {
                EntityHandle edg = candidate_edges[k];
                if( used_edges.find( edg ) != used_edges.end() ) continue;
                if( pool_of_edges.find( edg ) != pool_of_edges.end() ) good_edges.push_back( edg );
            }
            if( good_edges.size() != 1 )
            {
                std::cout << " good_edges.size()=" << good_edges.size() << " STOP\n";
                MB_SET_ERR( MB_FAILURE, "Number of good edges is not one. Could not complete the loop" );
            }
            // see if the orientation is good; if not, revert it

            current_edge = good_edges[0];
            rval         = mdbImpl->get_connectivity( current_edge, conn2, nnodes2 );MB_CHK_SET_ERR( rval, "Failed to get the connectivity of the current edge" );
            if( nnodes2 != 2 ) MB_SET_ERR( MB_FAILURE, "Incorrect number of nodes found" );

            if( conn2[0] != next_node )
            {
                if( conn2[1] != next_node )
                {
                    // the edge is not connected then to current edge
                    // bail out
                    std::cout << "edge " << mdbImpl->id_from_handle( current_edge ) << " not connected to node "
                              << next_node << "\n";
                    MB_SET_ERR( MB_FAILURE, "Current edge is not connected to node" );
                    ;
                }
                if( debugFlag )
                {
                    std::cout << " revert edge " << mdbImpl->id_from_handle( current_edge ) << "\n";
                    std::cout << mdbImpl->list_entity( current_edge );
                }
                // orientation should be reversed
                EntityHandle nn2[2] = { conn2[1], conn2[0] };
                rval                = mdbImpl->set_connectivity( current_edge, nn2, 2 );MB_CHK_SET_ERR( rval, "Failed to set the connectivity of the current edge" );

                {
                    std::cout << "after revert edge " << mdbImpl->id_from_handle( current_edge ) << "\n";
                    std::cout << mdbImpl->list_entity( current_edge );
                    std::cout << " conn2: " << conn2[0] << " " << conn2[1] << "\n";
                }
            }
            // before reversion, conn2 was something { n1, next_node}
            // after reversion, conn2 became {next_node, n1}, so the
            // new next node will be still conn2[1]; big surprise, as
            //  I didn't expect the conn2 to change.
            // it seems that const EntityHandle * conn2 means conn2 cannot be
            // changed, but what is pointed to by it will change when we reset connectivity for edge
            next_node = conn2[1];

            if( debugFlag )
            {
                std::cout << " current edge: " << mdbImpl->id_from_handle( current_edge ) << "\n ";
                std::cout << mdbImpl->list_entity( current_edge );
                std::cout << "next node: " << next_node << "\n ";
                std::cout << mdbImpl->list_entity( next_node );
            }
            edges_loop.push_back( current_edge );
            used_edges.insert( current_edge );
            pool_of_edges.erase( current_edge );
        }
        // at this point, we have a loop formed;
        // create a geo edge, a vertex set, and add it to our sets

        EntityHandle edge;
        rval = mdbImpl->create_meshset( MESHSET_ORDERED, edge );MB_CHK_SET_ERR( rval, "Failed to create the edge meshset" );

        rval = add_geo_set( edge, 1 );MB_CHK_SET_ERR( rval, "Failed to add the edge meshset to the tool's model set" );
        // add the mesh edges:
        // add loops edges to the edge set
        rval = mdbImpl->add_entities( edge, &edges_loop[0], edges_loop.size() );  //
        MB_CHK_SET_ERR( rval, "Failed to add entities to the edge meshset" );
        // create a vertex set
        EntityHandle vertex;
        rval = mdbImpl->create_meshset( MESHSET_SET, vertex );MB_CHK_SET_ERR( rval, "Failed to create the vertex meshset" );
        rval = add_geo_set( vertex, 0 );MB_CHK_SET_ERR( rval, "Failed to add the vertex meshset to the tool's model set" );
        // add one node to the vertex set

        rval = mdbImpl->add_entities( vertex, &start_node, 1 );  //
        MB_CHK_SET_ERR( rval, "Failed to add entities to the vertex meshset" );

        rval = mdbImpl->add_parent_child( face, edge );MB_CHK_SET_ERR( rval, "Failed to create the edge to face parent child relationship" );

        rval = mdbImpl->add_parent_child( edge, vertex );MB_CHK_SET_ERR( rval, "Failed to create the vertex to edge parent child relationship" );

        // the sense of the edge in face is for sure positive (forward)
        rval = set_sense( edge, face, 1 );  //
        MB_CHK_SET_ERR( rval, "Failed to set the edge to face sense" );
        // also add our sets to the output set, to be sure to be exported

        rval = mdbImpl->add_entities( output, &edge, 1 );MB_CHK_SET_ERR( rval, "Failed to add the edge meshset to the output set" );
        rval = mdbImpl->add_entities( output, &vertex, 1 );MB_CHK_SET_ERR( rval, "Failed to add the vertex meshset to the output set" );

        if( debugFlag )
        { std::cout << "add edge with start node " << start_node << " with " << edges_loop.size() << " edges\n"; }
    }

    return MB_SUCCESS;
}

/*
 *  This would create a deep copy of the geom topo model, into a new geom topo tool
 * sets will be duplicated, but entities not
 * modelSet will be a new one
 * if the original set was null (root), a new model set will be created for
 * original model, and its entities will be the original g sets
 * Scenario: split a face along a ground line, then write only one surface
 *   the common line has 2 faces in var len tag for sense edge; if we write only one
 *   surface to a new database, the var len tag of the edge will be extracted with 2 values, but
 *   only one value will make sense, the other will be zero.
 *
 *   There is no workaround; we need to create a duplicate model that has only that surface
 *   and its children (and grand-children). Then the var len sense edge-face tags will have
 *   the right size.
 *
 */
ErrorCode GeomTopoTool::duplicate_model( GeomTopoTool*& duplicate, std::vector< EntityHandle >* pvGEnts )
{
    // will
    EntityHandle rootModelSet;
    ErrorCode rval = mdbImpl->create_meshset( MESHSET_SET, rootModelSet );MB_CHK_SET_ERR( rval, "Failed to create the rootModelSet" );

    if( 0 == geomTag )
    {
        rval = mdbImpl->tag_get_handle( GEOM_DIMENSION_TAG_NAME, 1, MB_TYPE_INTEGER, geomTag );MB_CHK_SET_ERR( rval, "Failed to get the geometry dimension tag handle" );
    }
    if( 0 == gidTag ) { gidTag = mdbImpl->globalId_tag(); }
    // extract from the geomSet the dimension, children, and grand-children
    Range depSets;  // dependents of the geomSet, including the geomSet
    // add in this range all the dependents of this, to filter the ones that need to be deep copied

    if( pvGEnts != NULL )
    {
        unsigned int numGents = pvGEnts->size();
        for( unsigned int k = 0; k < numGents; k++ )
        {
            EntityHandle geomSet = ( *pvGEnts )[k];
            // will keep accumulating to the depSets range
            rval = mdbImpl->get_child_meshsets( geomSet, depSets, 0 );  // 0 for numHops means that all
            // dependents are returned, not only the direct children.
            MB_CHK_SET_ERR( rval, "Failed to get the geometry set's child meshsets" );

            depSets.insert( geomSet );
        }
    }

    // add to the root model set copies of the gsets, with correct sets
    // keep a map between sets to help in copying parent/child relations
    std::map< EntityHandle, EntityHandle > relate;
    // each set will get the same entities as the original
    for( int dim = 0; dim < 5; dim++ )
    {
        int gid                  = 0;
        unsigned int set_options = ( ( 1 != dim ) ? MESHSET_SET : MESHSET_ORDERED );
        for( Range::iterator it = geomRanges[dim].begin(); it != geomRanges[dim].end(); ++it )
        {
            EntityHandle set = *it;
            if( pvGEnts != NULL && depSets.find( set ) == depSets.end() )
                continue;  // this means that this set is not of interest, skip it
            EntityHandle newSet;
            rval = mdbImpl->create_meshset( set_options, newSet );MB_CHK_SET_ERR( rval, "Failed to create new meshset" );

            relate[set] = newSet;
            rval        = mdbImpl->add_entities( rootModelSet, &newSet, 1 );MB_CHK_SET_ERR( rval, "Failed to add the new meshset to the tool's modelSet" );

            // make it a geo set, and give also global id in order
            rval = mdbImpl->tag_set_data( geomTag, &newSet, 1, &dim );MB_CHK_SET_ERR( rval, "Failed to set the new meshset's geometry dimension data" );

            gid++;  // increment global id, everything starts with 1 in the new model!
            rval = mdbImpl->tag_set_data( gidTag, &newSet, 1, &gid );MB_CHK_SET_ERR( rval, "Failed to get the new meshset's global id data" );

            if( dim == 1 )
            {
                // the entities are ordered, we need to retrieve them ordered, and set them ordered
                std::vector< EntityHandle > mesh_edges;
                rval = mdbImpl->get_entities_by_handle( set, mesh_edges );MB_CHK_SET_ERR( rval, "Failed to get the meshset entities by handle" );

                rval = mdbImpl->add_entities( newSet, &( mesh_edges[0] ), (int)mesh_edges.size() );MB_CHK_SET_ERR( rval, "Failed to add the new entities to the new meshset" );
            }
            else
            {
                Range ents;
                rval = mdbImpl->get_entities_by_handle( set, ents );MB_CHK_SET_ERR( rval, "Failed to add the entities to the existing meshset" );

                rval = mdbImpl->add_entities( newSet, ents );MB_CHK_SET_ERR( rval, "Failed to add the entities to the new meshset" );
            }
            // set parent/child relations if dim>=1
            if( dim >= 1 )
            {
                Range children;
                // the children of geo sets are only g sets
                rval = mdbImpl->get_child_meshsets( set, children );  // num_hops = 1 by default
                MB_CHK_SET_ERR( rval, "Failed to get the child meshsets of the existing set" );

                for( Range::iterator it2 = children.begin(); it2 != children.end(); ++it2 )
                {
                    EntityHandle newChildSet = relate[*it2];
                    rval                     = mdbImpl->add_parent_child( newSet, newChildSet );MB_CHK_SET_ERR( rval, "Failed to create parent child relationship to the new meshset" );
                }
            }
        }
    }

    duplicate = new GeomTopoTool( mdbImpl, true, rootModelSet );  // will retrieve the
    // sets and put them in ranges

    // this is the lazy way to it:
    // newgtt->restore_topology_from_adjacency(); // will reset the sense entities, and with this,
    // the model represented by this new gtt will be complete set senses by peeking at the old model
    // make sure we have the sense tags defined
    rval = check_face_sense_tag( true );MB_CHK_SET_ERR( rval, "Failed to check the face to volume sense tag handle" );

    rval = check_edge_sense_tags( true );MB_CHK_SET_ERR( rval, "Failed to check the curve to surface sense tag handles" );

    for( int dd = 1; dd <= 2; dd++ )  // do it for surfaces and edges
    {
        for( Range::iterator it = geomRanges[dd].begin(); it != geomRanges[dd].end(); ++it )
        {
            EntityHandle surf = *it;
            if( pvGEnts != NULL && depSets.find( surf ) == depSets.end() )
                continue;  // this means that this set is not of interest, skip it
            EntityHandle newSurf = relate[surf];
            // we can actually look at the tag data, to be more efficient
            // or use the
            std::vector< EntityHandle > solids;
            std::vector< int > senses;
            rval = this->get_senses( surf, solids, senses );MB_CHK_SET_ERR( rval, "Failed to get the sense data for the surface with respect to its volumes" );

            std::vector< EntityHandle > newSolids;
            std::vector< int > newSenses;
            for( unsigned int i = 0; i < solids.size(); i++ )
            {
                if( pvGEnts != NULL && depSets.find( solids[i] ) == depSets.end() )
                    continue;  // this means that this set is not of interest, skip it
                EntityHandle newSolid = relate[solids[i]];
                // see which "solids" are in the new model
                newSolids.push_back( newSolid );
                newSenses.push_back( senses[i] );
            }
            rval = duplicate->set_senses( newSurf, newSolids, newSenses );MB_CHK_SET_ERR( rval, "Failed to set the sense data for the surface with respect to the new volumes" );
        }
    }
    // if the original root model set for this model is 0 (root set), then create
    // a new set and put all the old sets in the new model set
    // in this way, the existing gtt remains valid (otherwise, the modelSet would contain all the
    // gsets, the old ones and the new ones; the root set contains everything)
    if( modelSet == 0 )
    {
        rval = mdbImpl->create_meshset( MESHSET_SET, modelSet );MB_CHK_SET_ERR( rval, "Failed to create the modelSet meshset" );

        // add to this new set all previous sets (which are still in ranges)
        for( int dim = 0; dim < 5; dim++ )
        {
            rval = mdbImpl->add_entities( modelSet, geomRanges[dim] );MB_CHK_SET_ERR( rval, "Failed to add the geometric meshsets to the tool's modelSet" );
        }
    }
    return MB_SUCCESS;
}

ErrorCode GeomTopoTool::get_implicit_complement( EntityHandle& implicit_complement )
{
    if( impl_compl_handle )
    {
        implicit_complement = impl_compl_handle;
        return MB_SUCCESS;
    }
    else
    {
        return MB_ENTITY_NOT_FOUND;
    }
}

ErrorCode GeomTopoTool::setup_implicit_complement()
{

    // if the implicit complement is already setup,
    // we're done
    if( impl_compl_handle != 0 )
    {
        std::cout << "IPC already exists!" << std::endl;
        return MB_SUCCESS;
    }

    // if not, then query for a set with it's name
    Range entities;
    const void* const tagdata[] = { IMPLICIT_COMPLEMENT_NAME };
    ErrorCode rval = mdbImpl->get_entities_by_type_and_tag( modelSet, MBENTITYSET, &nameTag, tagdata, 1, entities );
    // query error
    MB_CHK_SET_ERR( rval, "Unable to query for implicit complement" );

    // if we found exactly one, set it as the implicit complement
    if( entities.size() == 1 )
    {
        impl_compl_handle = entities.front();
        return MB_SUCCESS;
    }

    // found too many
    if( entities.size() > 1 ) MB_CHK_SET_ERR( MB_MULTIPLE_ENTITIES_FOUND, "Too many implicit complement sets" );

    // found none
    if( entities.empty() )
    {
        // create implicit complement if requested
        rval = generate_implicit_complement( impl_compl_handle );MB_CHK_SET_ERR( rval, "Could not create implicit complement" );

        rval = mdbImpl->tag_set_data( nameTag, &impl_compl_handle, 1, &IMPLICIT_COMPLEMENT_NAME );MB_CHK_SET_ERR( rval, "Could not set the name tag for the implicit complement" );

        rval = add_geo_set( impl_compl_handle, 3 );MB_CHK_SET_ERR( rval, "Failed to add implicit complement to model" );

        // assign category tag - this is presumably for consistency so that the
        // implicit complement has all the appearance of being the same as any
        // other volume
        Tag category_tag;
        rval = mdbImpl->tag_get_handle( CATEGORY_TAG_NAME, CATEGORY_TAG_SIZE, MB_TYPE_OPAQUE, category_tag,
                                        MB_TAG_SPARSE | MB_TAG_CREAT );MB_CHK_SET_ERR( rval, "Could not get the category tag" );

        static const char volume_category[CATEGORY_TAG_SIZE] = "Volume\0";
        rval = mdbImpl->tag_set_data( category_tag, &impl_compl_handle, 1, volume_category );MB_CHK_SET_ERR( rval, "Could not set the category tag for the implicit complement" );

        return MB_SUCCESS;
    }

    return MB_FAILURE;
}

ErrorCode GeomTopoTool::generate_implicit_complement( EntityHandle& implicit_complement_set )
{

    ErrorCode rval;
    rval = mdbImpl->create_meshset( MESHSET_SET, implicit_complement_set );MB_CHK_SET_ERR( rval, "Failed to create mesh set for implicit complement" );

    // make sure the sense2Tag is set
    if( !sense2Tag ) { check_face_sense_tag( true ); }

    // get all geometric surface sets
    Range surfs;
    rval = get_gsets_by_dimension( 2, surfs );MB_CHK_SET_ERR( rval, "Could not get surface sets" );

    // search through all surfaces
    std::vector< EntityHandle > parent_vols;
    for( Range::iterator surf_i = surfs.begin(); surf_i != surfs.end(); ++surf_i )
    {

        parent_vols.clear();
        // get parents of each surface
        rval = mdbImpl->get_parent_meshsets( *surf_i, parent_vols );MB_CHK_SET_ERR( rval, "Failed to get volume meshsets" );

        // if only one parent, get the OBB root for this surface
        if( parent_vols.size() == 1 )
        {

            // add this surf to the topology of the implicit complement volume
            rval = mdbImpl->add_parent_child( implicit_complement_set, *surf_i );MB_CHK_SET_ERR( rval, "Could not add surface to implicit complement set" );

            // get the surface sense wrt original volume
            EntityHandle sense_data[2] = { 0, 0 };
            rval                       = get_surface_senses( *surf_i, sense_data[0], sense_data[1] );MB_CHK_SET_ERR( rval, "Could not get surface sense data" );

            // set the surface sense wrt implicit complement volume
            if( 0 == sense_data[0] && 0 == sense_data[1] )
                MB_SET_ERR( MB_FAILURE, "No sense data for current surface" );
            if( 0 == sense_data[0] )
                sense_data[0] = implicit_complement_set;
            else if( 0 == sense_data[1] )
                sense_data[1] = implicit_complement_set;
            else
                MB_SET_ERR( MB_FAILURE, "Could not insert implicit complement into surface sense data" );

            // set the new sense data for this surface
            rval = set_surface_senses( *surf_i, sense_data[0], sense_data[1] );MB_CHK_SET_ERR( rval, "Failed to set sense tag data" );
        }
    }  // end surface loop

    return MB_SUCCESS;
}

#define RETFALSE( a, b )           \
    {                              \
        std::cout << a << "\n";    \
        mdbImpl->list_entity( b ); \
        return false;              \
    }
bool GeomTopoTool::check_model()
{
    // vertex sets should have one node
    Range::iterator rit;
    ErrorCode rval;
    for( rit = geomRanges[0].begin(); rit != geomRanges[0].end(); ++rit )
    {
        EntityHandle vSet = *rit;
        Range nodes;
        rval = mdbImpl->get_entities_by_handle( vSet, nodes );
        if( MB_SUCCESS != rval ) RETFALSE( " failed to get nodes from vertex set ", vSet );
        if( nodes.size() != 1 ) RETFALSE( " number of nodes is different from 1 ", vSet )
        EntityType type = mdbImpl->type_from_handle( nodes[0] );
        if( type != MBVERTEX ) RETFALSE( " entity in vertex set is not a node ", nodes[0] )
        // get all parents, and see if they belong to geomRanges[1]
        Range edges;
        rval = mdbImpl->get_parent_meshsets( vSet, edges );
        if( MB_SUCCESS != rval ) RETFALSE( " can't get parent edges for a node set ", vSet )
        Range notEdges = subtract( edges, geomRanges[1] );
        if( !notEdges.empty() ) RETFALSE( " some parents of a node set are not geo edges ", notEdges[0] )
    }

    // edges to be formed by continuous chain of mesh edges, oriented correctly
    for( rit = geomRanges[1].begin(); rit != geomRanges[1].end(); ++rit )
    {
        EntityHandle edge = *rit;
        std::vector< EntityHandle > mesh_edges;
        rval = mdbImpl->get_entities_by_type( edge, MBEDGE, mesh_edges );
        if( MB_SUCCESS != rval ) RETFALSE( " can't get mesh edges from edge set", edge )
        int num_edges = (int)mesh_edges.size();
        if( num_edges == 0 ) RETFALSE( " no mesh edges in edge set ", edge )
        EntityHandle firstNode;
        EntityHandle currentNode;  // will also hold the last node in chain of edges
        const EntityHandle* conn2;
        int nnodes2;
        // get all parents, and see if they belong to geomRanges[1]
        for( int i = 0; i < num_edges; i++ )
        {
            rval = mdbImpl->get_connectivity( mesh_edges[i], conn2, nnodes2 );
            if( MB_SUCCESS != rval || nnodes2 != 2 ) RETFALSE( " mesh edge connectivity is wrong ", mesh_edges[i] )
            if( i == 0 )
            {
                firstNode   = conn2[0];
                currentNode = conn2[1];
            }

            else  // if ( (i>0) )
            {
                // check the current node is conn[0]
                if( conn2[0] != currentNode )
                {
                    std::cout << "i=" << i << " conn2:" << conn2[0] << " " << conn2[1] << " currentNode:" << currentNode
                              << "\n";
                    mdbImpl->list_entity( mesh_edges[i] );
                    RETFALSE( " edges are not contiguous in edge set ", edge )
                }
                currentNode = conn2[1];
            }
        }
        // check the children of the edge set; do they have the first and last node?
        Range vertSets;
        rval = mdbImpl->get_child_meshsets( edge, vertSets );
        if( MB_SUCCESS != rval ) RETFALSE( " can't get vertex children ", edge )
        Range notVertices = subtract( vertSets, geomRanges[0] );
        if( !notVertices.empty() ) RETFALSE( " children sets that are not vertices ", notVertices[0] )
        for( Range::iterator it = vertSets.begin(); it != vertSets.end(); ++it )
        {
            if( !mdbImpl->contains_entities( *it, &firstNode, 1 ) &&
                !mdbImpl->contains_entities( *it, &currentNode, 1 ) )
                RETFALSE( " a vertex set is not containing the first and last nodes ", *it )
        }
        // check now the faces / parents
        Range faceSets;
        rval = mdbImpl->get_parent_meshsets( edge, faceSets );
        if( MB_SUCCESS != rval ) RETFALSE( " can't get edge parents ", edge )
        Range notFaces = subtract( faceSets, geomRanges[2] );
        if( !notFaces.empty() ) RETFALSE( " parent sets that are not faces ", notFaces[0] )

        // for a geo edge, check the sense tags with respect to the adjacent faces
        // in general, it is sufficient to check one mesh edge (the first one)
        // edge/face  senses
        EntityHandle firstMeshEdge = mesh_edges[0];
        // get all entities/elements adjacent to it
        Range adjElem;
        rval = mdbImpl->get_adjacencies( &firstMeshEdge, 1, 2, false, adjElem );
        if( MB_SUCCESS != rval ) RETFALSE( " can't get adjacent elements to the edge ", firstMeshEdge )
        for( Range::iterator it2 = adjElem.begin(); it2 != adjElem.end(); ++it2 )
        {
            EntityHandle elem = *it2;
            // find the geo face it belongs to
            EntityHandle gFace = 0;
            for( Range::iterator fit = faceSets.begin(); fit != faceSets.end(); ++fit )
            {
                EntityHandle possibleFace = *fit;
                if( mdbImpl->contains_entities( possibleFace, &elem, 1 ) )
                {
                    gFace = possibleFace;
                    break;
                }
            }
            if( 0 == gFace )
                RETFALSE( " can't find adjacent surface that contains the adjacent element to the edge ",
                          firstMeshEdge )

            // now, check the sense of mesh_edge in element, and the sense of gedge in gface
            // side_number
            int side_n, sense, offset;
            rval = mdbImpl->side_number( elem, firstMeshEdge, side_n, sense, offset );
            if( MB_SUCCESS != rval ) RETFALSE( " can't get sense and side number of an element ", elem )
            // now get the sense
            int topoSense;
            rval = this->get_sense( edge, gFace, topoSense );
            if( topoSense != sense ) RETFALSE( " geometric topo sense and element sense do not agree ", edge )
        }
    }
    // surfaces to be true meshes
    // for surfaces, check that the skinner will find the correct boundary

    // use the skinner for boundary check
    Skinner tool( mdbImpl );

    for( rit = geomRanges[2].begin(); rit != geomRanges[2].end(); ++rit )
    {
        EntityHandle faceSet = *rit;
        // get all boundary edges (adjacent edges)

        Range edges;
        rval = mdbImpl->get_child_meshsets( faceSet, edges );
        if( MB_SUCCESS != rval ) RETFALSE( " can't get children edges for a face set ", faceSet )
        Range notEdges = subtract( edges, geomRanges[1] );
        if( !notEdges.empty() ) RETFALSE( " some children of a face set are not geo edges ", notEdges[0] )

        Range boundary_mesh_edges;
        for( Range::iterator it = edges.begin(); it != edges.end(); ++it )
        {
            rval = mdbImpl->get_entities_by_type( *it, MBEDGE, boundary_mesh_edges );
            if( MB_SUCCESS != rval ) RETFALSE( " can't get edge elements from the edge set ", *it )
        }
        // skin the elements of the surface
        // most of these should be triangles and quads
        Range surface_ents, edge_ents;
        rval = mdbImpl->get_entities_by_dimension( faceSet, 2, surface_ents );
        if( MB_SUCCESS != rval ) RETFALSE( " can't get surface elements from the face set ", faceSet )

        rval = tool.find_skin( 0, surface_ents, 1, edge_ents );
        if( MB_SUCCESS != rval ) RETFALSE( "can't skin a surface ", surface_ents[0] )

        // those 2 ranges for boundary edges now must be equal
        if( boundary_mesh_edges != edge_ents ) RETFALSE( "boundary ranges are different", boundary_mesh_edges[0] )
    }

    // solids to be filled correctly, maybe a skin procedure too.
    // (maybe the solids are empty)

    return true;
}

bool GeomTopoTool::have_obb_tree()
{
    return rootSets.size() != 0 || mapRootSets.size() != 0;
}

// This function gets coordinates of the minimum and maxmiumum points
// from an OBB/AABB, ie. such that these points represent
// the maximum and minium extents of an AABB
ErrorCode GeomTopoTool::get_bounding_coords( EntityHandle volume, double minPt[3], double maxPt[3] )
{
    double center[3], axis1[3], axis2[3], axis3[3];

    // get center point and vectors to OBB faces
    ErrorCode rval = get_obb( volume, center, axis1, axis2, axis3 );MB_CHK_SET_ERR( rval, "Failed to get the oriented bounding box of the volume" );

    // compute min and max vertices
    for( int i = 0; i < 3; i++ )
    {
        double sum = fabs( axis1[i] ) + fabs( axis2[i] ) + fabs( axis3[i] );
        minPt[i]   = center[i] - sum;
        maxPt[i]   = center[i] + sum;
    }
    return MB_SUCCESS;
}

ErrorCode GeomTopoTool::get_obb( EntityHandle volume, double center[3], double axis1[3], double axis2[3],
                                 double axis3[3] )
{
    // find EntityHandle node_set for use in box
    EntityHandle root;
    ErrorCode rval = get_root( volume, root );MB_CHK_SET_ERR( rval, "Failed to get volume's obb tree root" );

    // call box to get center and vectors to faces
    return obbTree->box( root, center, axis1, axis2, axis3 );
}

Range GeomTopoTool::get_ct_children_by_dimension( EntityHandle parent, int desired_dimension )
{
    Range all_children, desired_children;
    Range::iterator it;
    int actual_dimension;

    desired_children.clear();
    all_children.clear();
    mdbImpl->get_child_meshsets( parent, all_children );

    for( it = all_children.begin(); it != all_children.end(); ++it )
    {
        mdbImpl->tag_get_data( geomTag, &( *it ), 1, &actual_dimension );
        if( actual_dimension == desired_dimension ) desired_children.insert( *it );
    }

    return desired_children;
}

// runs GeomQueryTool point_in_vol and to test if vol A is inside vol B
//  returns true or false
bool GeomTopoTool::A_is_in_B( EntityHandle volume_A, EntityHandle volume_B, GeomQueryTool* GQT )
{
    ErrorCode rval;

    Range child_surfaces, triangles, vertices;
    double coord[3];  // coord[0] = x, etc.
    int result;       // point in vol result; 0=F, 1=T

    // find coordinates of any point on surface of A
    // get surface corresponding to volume, then get the triangles
    child_surfaces = get_ct_children_by_dimension( volume_A, 2 );
    rval           = mdbImpl->get_entities_by_type( *child_surfaces.begin(), MBTRI, triangles );MB_CHK_ERR( rval );

    // now get 1st triangle vertices
    rval = mdbImpl->get_connectivity( &( *triangles.begin() ), 1, vertices );MB_CHK_ERR( rval );

    // now get coordinates of first vertex
    rval = mdbImpl->get_coords( &( *vertices.begin() ), 1, &( coord[0] ) );MB_CHK_ERR( rval );

    // if point on A is inside vol B, return T; o.w. return F
    rval = GQT->point_in_volume( volume_B, coord, result );MB_CHK_SET_ERR( rval, "Failed to complete point in volume query." );

    return ( result != 0 );
}

ErrorCode GeomTopoTool::insert_in_tree( EntityHandle ct_root, EntityHandle volume, GeomQueryTool* GQT )
{
    ErrorCode rval;

    bool inserted               = false;
    EntityHandle current_volume = volume;   // volume to be inserted
    EntityHandle tree_volume    = ct_root;  // volume already existing in the tree
    EntityHandle parent         = ct_root;
    Range child_volumes;

    // while not inserted in tree
    while( !inserted )
    {
        // if current volume is insde of tree volume-- always true if tree volume
        // is the root of the tree
        if( tree_volume == ct_root || ( tree_volume != ct_root && A_is_in_B( current_volume, tree_volume, GQT ) ) )
        {

            parent = tree_volume;

            // if tree_volume has children then we must test them,
            // (tree_volume will change)
            child_volumes = get_ct_children_by_dimension( tree_volume, 3 );
            if( child_volumes.size() > 0 ) tree_volume = child_volumes.pop_front();
            // otherwise current_volume is the only child of the tree volume
            else
            {
                rval = mdbImpl->add_parent_child( parent, current_volume );MB_CHK_SET_ERR( rval, "Failed to add parent-child relationship." );

                inserted = true;
            }
            // if current volume is not in the tree volume, the converse may be true
        }
        else
        {
            // if the tree volume is inside the current volume
            if( A_is_in_B( tree_volume, current_volume, GQT ) )
            {
                // reverse their parentage
                rval = mdbImpl->remove_parent_child( parent, tree_volume );MB_CHK_SET_ERR( rval, "Failed to remove parent-child relationship." );
                rval = mdbImpl->add_parent_child( current_volume, tree_volume );MB_CHK_SET_ERR( rval, "Failed to add parent-child relationship." );
            }

            if( child_volumes.size() == 0 )
            {
                rval = mdbImpl->add_parent_child( parent, current_volume );MB_CHK_SET_ERR( rval, "Failed to add parent-child relationship." );
                inserted = true;
            }
            else
                tree_volume = child_volumes.pop_front();
        }
    }
    return MB_SUCCESS;
}

ErrorCode GeomTopoTool::restore_topology_from_geometric_inclusion( const Range& flat_volumes )
{

    ErrorCode rval;
    // local var will go out of scope if errors appear, no need to free it also
    GeomQueryTool GQT( this );
    std::map< EntityHandle, EntityHandle > volume_surface;  // map of volume
                                                            // to its surface

    EntityHandle ct_root;
    // create root meshset-- this will be top of tree
    std::string meshset_name = "build_hierarchy_root";
    rval                     = mdbImpl->create_meshset( MESHSET_SET, ct_root );MB_CHK_ERR( rval );
    rval = mdbImpl->tag_set_data( nameTag, &ct_root, 1, meshset_name.c_str() );MB_CHK_ERR( rval );

    for( Range::iterator vol = flat_volumes.begin(); vol != flat_volumes.end(); vol++ )
    {
        // get the surface corresponding to each volume
        // at this point, each volume meshset only has one 'child' surface
        // which exactly corresponds to that volume
        Range child_surfaces = get_ct_children_by_dimension( *vol, 2 );
        volume_surface[*vol] = *child_surfaces.begin();

        rval = insert_in_tree( ct_root, *vol, &GQT );MB_CHK_SET_ERR( rval, "Failed to insert volume into tree." );
    }

    // for each original volume, get its child volumes
    for( Range::iterator parent_it = flat_volumes.begin(); parent_it != flat_volumes.end(); parent_it++ )
    {
        Range volume_children = get_ct_children_by_dimension( *parent_it, 3 );

        if( volume_children.size() != 0 )
        {
            // loop over all of original volume's child volumes
            for( Range::iterator child_it = volume_children.begin(); child_it != volume_children.end(); ++child_it )
            {
                // set the sense of the surface mapped to the child volume to REVERSE
                // wrt the parent volume
                rval = set_sense( volume_surface[*child_it], *parent_it, SENSE_REVERSE );MB_CHK_SET_ERR( rval, "Failed to set sense." );

                // add the child volume's surface as a child of the original volume
                // and delete the child volume as a child of original volume
                rval = mdbImpl->add_parent_child( *parent_it, volume_surface[*child_it] );MB_CHK_SET_ERR( rval, "Failed to add parent-child relationship." );
                rval = mdbImpl->remove_parent_child( *parent_it, *child_it );MB_CHK_SET_ERR( rval, "Failed to remove parent-child relationship." );
            }
        }
    }

    return MB_SUCCESS;
}

}  // namespace moab