obb_analysis.cpp File Reference

#include <iostream>
#include <fstream>
#include <sstream>
#include "moab/Core.hpp"
#include "moab/Interface.hpp"
#include "moab/OrientedBoxTreeTool.hpp"
#include "moab/CartVect.hpp"
#include "moab/OrientedBox.hpp"
#include "moab/GeomTopoTool.hpp"
#include "cgm2moab.hpp"

Include dependency graph for obb_analysis.cpp:

Go to the source code of this file.

Classes
class	TriCounter
class	TriStats
Functions
ErrorCode	obbvis_create (GeomTopoTool &gtt, std::vector< int > &volumes, int grid, std::string &filename)
static double	std_dev (double sqr, double sum, double count)
ErrorCode	obbstat_write (GeomTopoTool &gtt, std::vector< int > &volumes, std::vector< std::string > &properties, std::ostream &out)

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Function Documentation

ErrorCode obbstat_write	(	GeomTopoTool &	gtt,
		std::vector< int > &	volumes,
		std::vector< std::string > &	properties,
		std::ostream &	out
	)

Definition at line 374 of file obb_analysis.cpp.

References moab::Range::begin(), CHECKERR, moab::Range::end(), moab::GeomTopoTool::entity_by_id(), ErrorCode, moab::Interface::get_child_meshsets(), moab::GeomTopoTool::get_moab_instance(), moab::GeomTopoTool::get_root(), moab::GeomTopoTool::global_id(), moab::GeomTopoTool::is_implicit_complement(), MB_SUCCESS, moab::GeomTopoTool::obb_tree(), moab::OrientedBoxTreeTool::preorder_traverse(), moab::Range::size(), moab::OrientedBoxTreeTool::stats(), and verbose.

{

    ErrorCode ret                = MB_SUCCESS;
    OrientedBoxTreeTool& obbtool = *gtt.obb_tree();

    // can assume that volume numbers are valid.
    for( std::vector< int >::iterator i = volumes.begin(); i != volumes.end(); ++i )
    {
        EntityHandle vol_root;
        EntityHandle vol = gtt.entity_by_id( 3, *i );
        CHECKERR( gtt, ret );

        if( vol == 0 )
        {
            std::cerr << "ERROR: volume " << *i << " has no entity." << std::endl;
            continue;
        }

        ret = gtt.get_root( vol, vol_root );
        CHECKERR( gtt, ret );

        out << "\nVolume " << *i << " " << std::flush;

        if( gtt.is_implicit_complement( vol ) ) out << "(implicit complement) ";
        out << std::endl;

        // get all surfaces in volume
        Range surfs;
        ret = gtt.get_moab_instance()->get_child_meshsets( vol, surfs );
        CHECKERR( gtt, ret );

        out << "   with " << surfs.size() << " surfaces" << std::endl;

        TriStats ts( gtt.get_moab_instance(), &obbtool, vol_root );
        ret = obbtool.preorder_traverse( vol_root, ts );
        CHECKERR( gtt, ret );
        ts.write_results( out );

        if( verbose )
        {
            out << "Surface list: " << std::flush;
            for( Range::iterator j = surfs.begin(); j != surfs.end(); ++j )
            {
                out << gtt.global_id( *j );
                if( j + 1 != surfs.end() ) out << ",";
            }
            out << std::endl;
            ret = obbtool.stats( vol_root, out );
            CHECKERR( gtt, ret );
        }

        out << "\n    ------------ " << std::endl;
    }

    return ret;
}

ErrorCode obbvis_create	(	GeomTopoTool &	gtt,
		std::vector< int > &	volumes,
		int	grid,
		std::string &	filename
	)

Definition at line 50 of file obb_analysis.cpp.

References moab::Range::begin(), center(), CHECKERR, moab::Core::create_element(), moab::Core::create_vertices(), moab::Range::end(), moab::GeomTopoTool::entity_by_id(), ErrorCode, moab::Interface::get_child_meshsets(), moab::GeomTopoTool::get_moab_instance(), moab::GeomTopoTool::get_obb(), moab::GeomTopoTool::get_root(), MB_TAG_BYTES, MB_TAG_CREAT, MB_TAG_DENSE, MB_TAG_EXCL, MB_TYPE_INTEGER, MBHEX, moab::Range::merge(), moab::GeomTopoTool::obb_tree(), moab::OrientedBoxTreeTool::preorder_traverse(), moab::Range::size(), moab::sum(), moab::Core::tag_get_handle(), moab::Core::tag_set_data(), verbose, and moab::Core::write_file().

{
    OrientedBoxTreeTool& obbtool = *gtt.obb_tree();

    CartVect min, max;
    EntityHandle vol = gtt.entity_by_id( 3, volumes.front() );
    double middle[3];
    double axis1[3], axis2[3], axis3[3];
    double minPt[3], maxPt[3];
    ErrorCode rval = gtt.get_obb( vol, middle, axis1, axis2, axis3 );
    // compute min and max verticies
    for( int i = 0; i < 3; i++ )
    {
        double sum = fabs( axis1[i] ) + fabs( axis2[i] ) + fabs( axis3[i] );
        minPt[i]   = middle[i] - sum;
        maxPt[i]   = middle[i] + sum;
    }
    CHECKERR( gtt, rval );

    /* Compute an axis-aligned bounding box of all the requested volumes */
    for( std::vector< int >::iterator i = volumes.begin() + 1; i != volumes.end(); ++i )
    {
        CartVect i_min, i_max;
        vol  = gtt.entity_by_id( 3, *i );
        rval = gtt.get_obb( vol, middle, axis1, axis2, axis3 );
        // compute min and max verticies
        for( int j = 0; j < 3; j++ )
        {
            double sum = fabs( axis1[j] ) + fabs( axis2[j] ) + fabs( axis3[j] );
            minPt[j]   = middle[j] - sum;
            maxPt[j]   = middle[j] + sum;
        }

        for( int j = 0; j < 3; ++j )
        {
            min[j] = std::min( min[j], i_min[j] );
            max[j] = std::max( max[j], i_max[j] );
        }
    }

    // These vectors could be repurposed to describe an OBB without changing the loops below
    CartVect center( middle );
    CartVect v1( axis1 );
    CartVect v2( axis2 );
    CartVect v3( axis3 );

    /* Compute the vertices of the visualization grid.  Calculation points are at the center
       of each cell in this grid, so make grid+1 vertices in each direction. */
    int numpoints = pow( (double)( grid + 1 ), 3 );
    double* pgrid = new double[numpoints * 3];
    int idx       = 0;

    for( int i = 0; i < numpoints * 3; ++i )
        pgrid[i] = 0.0;

    for( int i = 0; i <= grid; ++i )
    {
        CartVect x = -v1 + ( ( v1 * 2.0 ) * ( i / (double)grid ) );

        for( int j = 0; j <= grid; ++j )
        {
            CartVect y = -v2 + ( ( v2 * 2.0 ) * ( j / (double)grid ) );

            for( int k = 0; k <= grid; ++k )
            {
                CartVect z = -v3 + ( ( v3 * 2.0 ) * ( k / (double)grid ) );

                CartVect p = center + x + y + z;
                for( int d = 0; d < 3; ++d )
                {
                    pgrid[idx++] = p[d];
                }
            }
        }
    }

    /* Create a new MOAB to use for output, and build the vertex grid */
    Core mb2;
    Range r;
    rval = mb2.create_vertices( pgrid, numpoints, r );
    CHECKERR( mb2, rval );

    Tag lttag;
    rval = mb2.tag_get_handle( "LEAFTRIS", sizeof( int ), MB_TYPE_INTEGER, lttag,
                               MB_TAG_EXCL | MB_TAG_CREAT | MB_TAG_BYTES | MB_TAG_DENSE, 0 );
    CHECKERR( mb2, rval );

    int row  = grid + 1;
    int side = row * row;
    EntityHandle connect[8];
    EntityHandle hex;

    // offset from grid corner to grid center
    CartVect grid_hex_center_offset = ( v1 + v2 + v3 ) * 2 * ( 1.0 / grid );

    // collect all the surfaces from the requested volumes to iterate over --
    // this prevents checking a shared surface more than once.
    Range surfs;
    for( std::vector< int >::iterator it = volumes.begin(); it != volumes.end(); ++it )
    {

        vol = gtt.entity_by_id( 3, *it );
        Range it_surfs;
        rval = gtt.get_moab_instance()->get_child_meshsets( vol, it_surfs );
        CHECKERR( gtt, rval );
        surfs.merge( it_surfs );
    }
    std::cout << "visualizing " << surfs.size() << " surfaces." << std::endl;

    /* Build hexes for any point with 1 or more leaftris */
    for( int i = 0; i < grid; ++i )
    {
        for( int j = 0; j < grid; ++j )
        {
            for( int k = 0; k < grid; ++k )
            {

                idx = ( side * k ) + ( row * j ) + i;
                assert( idx + 1 + row + side > numpoints - 1 );

                CartVect loc = CartVect( ( pgrid + ( idx * 3 ) ) ) + grid_hex_center_offset;
                TriCounter tc( gtt.get_moab_instance(), &obbtool, loc );

                for( Range::iterator it = surfs.begin(); it != surfs.end(); ++it )
                {

                    EntityHandle surf_tree;
                    rval = gtt.get_root( *it, surf_tree );
                    CHECKERR( gtt, rval );

                    rval = obbtool.preorder_traverse( surf_tree, tc );
                    CHECKERR( gtt, rval );
                }

                if( tc.count == 0 ) continue;

                connect[0] = r[idx];
                connect[1] = r[idx + 1];
                connect[2] = r[idx + 1 + row];
                connect[3] = r[idx + row];
                connect[4] = r[idx + side];
                connect[5] = r[idx + 1 + side];
                connect[6] = r[idx + 1 + row + side];
                connect[7] = r[idx + row + side];

                rval = mb2.create_element( MBHEX, connect, 8, hex );
                CHECKERR( mb2, rval );

                rval = mb2.tag_set_data( lttag, &hex, 1, &( tc.count ) );
                CHECKERR( mb2, rval );
            }
        }
    }

    if( verbose )
    {
        std::cout << "Writing " << filename << std::endl;
    }
    rval = mb2.write_file( filename.c_str() );
    CHECKERR( mb2, rval );

    return rval;
}

static double std_dev	(	double	sqr,
		double	sum,
		double	count
	)		[inline, static]

Definition at line 215 of file obb_analysis.cpp.

{
    sum /= count;
    sqr /= count;
    return sqrt( sqr - sum * sum );
}