kicad/pcbnew/exporters/step/step_pcb_model.cpp

/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2022 Mark Roszko <mark.roszko@gmail.com>
 * Copyright (C) 2016 Cirilo Bernardo <cirilo.bernardo@gmail.com>
 * Copyright (C) 2016-2024 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#include <algorithm>
#include <cmath>
#include <sstream>
#include <string>
#include <utility>
#include <wx/filename.h>
#include <wx/filefn.h>
#include <wx/stdpaths.h>
#include <wx/wfstream.h>
#include <wx/zipstrm.h>
#include <wx/stdstream.h>

#include <decompress.hpp>

#include <footprint.h>
#include <pad.h>
#include <pcb_track.h>
#include <kiplatform/io.h>
#include <string_utils.h>
#include <build_version.h>
#include <geometry/shape_segment.h>
#include <geometry/shape_circle.h>
#include <board_stackup_manager/board_stackup.h>
#include <board_stackup_manager/stackup_predefined_prms.h>

#include "step_pcb_model.h"
#include "streamwrapper.h"

#include <IGESCAFControl_Reader.hxx>
#include <IGESCAFControl_Writer.hxx>
#include <IGESControl_Controller.hxx>
#include <IGESData_GlobalSection.hxx>
#include <IGESData_IGESModel.hxx>
#include <Interface_Static.hxx>
#include <Quantity_Color.hxx>
#include <STEPCAFControl_Reader.hxx>
#include <STEPCAFControl_Writer.hxx>
#include <APIHeaderSection_MakeHeader.hxx>
#include <Standard_Failure.hxx>
#include <Standard_Handle.hxx>
#include <Standard_Version.hxx>
#include <TCollection_ExtendedString.hxx>
#include <TDocStd_Document.hxx>
#include <TDocStd_XLinkTool.hxx>
#include <TDataStd_Name.hxx>
#include <TDataStd_TreeNode.hxx>
#include <TDF_LabelSequence.hxx>
#include <TDF_Tool.hxx>
#include <TopExp_Explorer.hxx>
#include <TopoDS.hxx>
#include <XCAFApp_Application.hxx>
#include <XCAFDoc.hxx>
#include <XCAFDoc_DocumentTool.hxx>
#include <XCAFDoc_ColorTool.hxx>
#include <XCAFDoc_ShapeTool.hxx>
#include <XCAFDoc_Area.hxx>
#include <XCAFDoc_Centroid.hxx>
#include <XCAFDoc_Location.hxx>
#include <XCAFDoc_Volume.hxx>

#include "KI_XCAFDoc_AssemblyGraph.hxx"

#include <BRep_Tool.hxx>
#include <BRepMesh_IncrementalMesh.hxx>
#include <BRepBuilderAPI.hxx>
#include <BRepBuilderAPI_Transform.hxx>
#include <BRepBuilderAPI_GTransform.hxx>
#include <BRepBuilderAPI_MakeEdge.hxx>
#include <BRepBuilderAPI_MakeWire.hxx>
#include <BRepBuilderAPI_MakeFace.hxx>
#include <BRepBuilderAPI_MakeVertex.hxx>
#include <BRepExtrema_DistShapeShape.hxx>
#include <BRepPrimAPI_MakePrism.hxx>
#include <BRepPrimAPI_MakeCylinder.hxx>
#include <BRepTools.hxx>
#include <BRepLib_MakeWire.hxx>
#include <BRepAdaptor_Surface.hxx>
#include <BRepAlgoAPI_Check.hxx>
#include <BRepAlgoAPI_Cut.hxx>
#include <BRepAlgoAPI_Fuse.hxx>
#include <ShapeUpgrade_UnifySameDomain.hxx>

#include <BRepBndLib.hxx>
#include <Bnd_BoundSortBox.hxx>

#include <Geom_Curve.hxx>
#include <Geom_TrimmedCurve.hxx>

#include <gp_Ax2.hxx>
#include <gp_Dir.hxx>
#include <gp_Pnt.hxx>
#include <GC_MakeArcOfCircle.hxx>
#include <GC_MakeCircle.hxx>

#include <RWGltf_CafWriter.hxx>

#if OCC_VERSION_HEX >= 0x070700
#include <VrmlAPI_CafReader.hxx>
#endif

#include <macros.h>

static constexpr double USER_PREC = 1e-4;
static constexpr double USER_ANGLE_PREC = 1e-6;

// nominal offset from the board
static constexpr double BOARD_OFFSET = 0.05;

// supported file types for 3D models
enum MODEL3D_FORMAT_TYPE
{
    FMT_NONE,
    FMT_STEP,
    FMT_STEPZ,
    FMT_IGES,
    FMT_EMN,
    FMT_IDF,
    FMT_WRL,
    FMT_WRZ
};


MODEL3D_FORMAT_TYPE fileType( const char* aFileName )
{
    wxFileName lfile( wxString::FromUTF8Unchecked( aFileName ) );

    if( !lfile.FileExists() )
    {
        wxString msg;
        msg.Printf( wxT( " * fileType(): no such file: %s\n" ),
                    wxString::FromUTF8Unchecked( aFileName ) );

        ReportMessage( msg );
        return FMT_NONE;
    }

    wxString ext = lfile.GetExt().Lower();

    if( ext == wxT( "wrl" ) )
        return FMT_WRL;

    if( ext == wxT( "wrz" ) )
        return FMT_WRZ;

    if( ext == wxT( "idf" ) )
        return FMT_IDF;     // component outline

    if( ext == wxT( "emn" ) )
        return FMT_EMN;     // PCB assembly

    if( ext == wxT( "stpz" ) || ext == wxT( "gz" ) )
        return FMT_STEPZ;

    OPEN_ISTREAM( ifile, aFileName );

    if( ifile.fail() )
        return FMT_NONE;

    char iline[82];
    memset( iline, 0, 82 );
    ifile.getline( iline, 82 );
    CLOSE_STREAM( ifile );
    iline[81] = 0;  // ensure NULL termination when string is too long

    // check for STEP in Part 21 format
    // (this can give false positives since Part 21 is not exclusively STEP)
    if( !strncmp( iline, "ISO-10303-21;", 13 ) )
        return FMT_STEP;

    std::string fstr = iline;

    // check for STEP in XML format
    // (this can give both false positive and false negatives)
    if( fstr.find( "urn:oid:1.0.10303." ) != std::string::npos )
        return FMT_STEP;

    // Note: this is a very simple test which can yield false positives; the only
    // sure method for determining if a file *not* an IGES model is to attempt
    // to load it.
    if( iline[72] == 'S' && ( iline[80] == 0 || iline[80] == 13 || iline[80] == 10 ) )
        return FMT_IGES;

    return FMT_NONE;
}


static VECTOR2D CircleCenterFrom3Points( const VECTOR2D& p1, const VECTOR2D& p2,
                                         const VECTOR2D& p3 )
{
    VECTOR2D center;

    // Move coordinate origin to p2, to simplify calculations
    VECTOR2D b = p1 - p2;
    VECTOR2D d = p3 - p2;
    double   bc = ( b.x * b.x + b.y * b.y ) / 2.0;
    double   cd = ( -d.x * d.x - d.y * d.y ) / 2.0;
    double   det = -b.x * d.y + d.x * b.y;

    // We're fine with divisions by 0
    det = 1.0 / det;
    center.x = ( -bc * d.y - cd * b.y ) * det;
    center.y = ( b.x * cd + d.x * bc ) * det;
    center += p2;

    return center;
}


#define APPROX_DBG( stmt )
//#define APPROX_DBG( stmt ) stmt

static SHAPE_LINE_CHAIN approximateLineChainWithArcs( const SHAPE_LINE_CHAIN& aSrc )
{
    // An algo that takes 3 points, calculates a circle center,
    // then tries to find as many points fitting the circle.

    static const double c_radiusDeviation = 1000.0;
    static const double c_arcCenterDeviation = 1000.0;
    static const double c_relLengthDeviation = 0.8;
    static const int    c_last_none = -1000; // Meaning the arc cannot be constructed
    // Allow larger angles for segments below this size
    static const double c_smallSize = pcbIUScale.mmToIU( 0.1 );
    static const double c_circleCloseGap = pcbIUScale.mmToIU( 1.0 );

    APPROX_DBG( std::cout << std::endl );

    if( aSrc.PointCount() < 4 )
        return aSrc;

    if( !aSrc.IsClosed() )
        return aSrc; // non-closed polygons are not supported

    SHAPE_LINE_CHAIN dst;

    int jEndIdx = aSrc.PointCount() - 3;

    for( int i = 0; i < aSrc.PointCount(); i++ )
    {
        int first = i - 3;
        int last = c_last_none;

        VECTOR2D p0 = aSrc.CPoint( i - 3 );
        VECTOR2D p1 = aSrc.CPoint( i - 2 );
        VECTOR2D p2 = aSrc.CPoint( i - 1 );

        APPROX_DBG( std::cout << i << " " << aSrc.CPoint( i ) << " " << ( i - 3 ) << " "
                              << VECTOR2I( p0 ) << " " << ( i - 2 ) << " " << VECTOR2I( p1 ) << " "
                              << ( i - 1 ) << " " << VECTOR2I( p2 ) << std::endl );

        VECTOR2D v01 = p1 - p0;
        VECTOR2D v12 = p2 - p1;

        bool defective = false;

        double d01 = v01.EuclideanNorm();
        double d12 = v12.EuclideanNorm();

        // Check distance differences between 3 first points
        defective |= std::abs( d01 - d12 ) > ( std::max( d01, d12 ) * c_relLengthDeviation );

        if( !defective )
        {
            // Check angles between 3 first points
            EDA_ANGLE a01( v01 );
            EDA_ANGLE a12( v12 );

            double a_diff = ( a01 - a12 ).Normalize180().AsDegrees();
            defective |= std::abs( a_diff ) < 0.1;

            // Larger angles are allowed for smaller geometry
            double maxAngleDiff = std::max( d01, d12 ) < c_smallSize ? 46.0 : 30.0;
            defective |= std::abs( a_diff ) >= maxAngleDiff;
        }

        if( !defective )
        {
            // Find last point lying on the circle created from 3 first points
            VECTOR2D  center = CircleCenterFrom3Points( p0, p1, p2 );
            double    radius = ( p0 - center ).EuclideanNorm();
            VECTOR2D  p_prev = p2;
            EDA_ANGLE a_prev( v12 );

            for( int j = i; j <= jEndIdx; j++ )
            {
                VECTOR2D p_test = aSrc.CPoint( j );

                EDA_ANGLE a_test( p_test - p_prev );
                double    rad_test = ( p_test - center ).EuclideanNorm();
                double    d_tl = ( p_test - p_prev ).EuclideanNorm();
                double    rad_dev = std::abs( radius - rad_test );

                APPROX_DBG( std::cout << " " << j << " " << aSrc.CPoint( j ) << " rad "
                                      << int64_t( rad_test ) << " ref " << int64_t( radius )
                                      << std::endl );

                if( rad_dev > c_radiusDeviation )
                {
                    APPROX_DBG( std::cout << "  " << j
                                          << " Radius deviation too large: " << int64_t( rad_dev )
                                          << " > " << c_radiusDeviation << std::endl );
                    break;
                }

                // Larger angles are allowed for smaller geometry
                double maxAngleDiff =
                        std::max( std::max( d01, d12 ), d_tl ) < c_smallSize ? 46.0 : 30.0;

                double a_diff_test = ( a_prev - a_test ).Normalize180().AsDegrees();
                if( std::abs( a_diff_test ) >= maxAngleDiff )
                {
                    APPROX_DBG( std::cout << "  " << j << " Angles differ too much " << a_diff_test
                                          << std::endl );
                    break;
                }

                if( std::abs( d_tl - d01 ) > ( std::max( d_tl, d01 ) * c_relLengthDeviation ) )
                {
                    APPROX_DBG( std::cout << "  " << j << " Lengths differ too much " << d_tl
                                          << "; " << d01 << std::endl );
                    break;
                }

                last = j;
                p_prev = p_test;
                a_prev = a_test;
            }
        }

        if( last != c_last_none )
        {
            // Try to add an arc, testing for self-interference
            SHAPE_ARC arc( aSrc.CPoint( first ), aSrc.CPoint( ( first + last ) / 2 ),
                           aSrc.CPoint( last ), 0 );

            if( last > aSrc.PointCount() - 3 && !dst.IsArcSegment( 0 ) )
            {
                // If we've found an arc at the end, but already added segments at the start, remove them.
                int toRemove = last - ( aSrc.PointCount() - 3 );

                while( toRemove )
                {
                    dst.RemoveShape( 0 );
                    toRemove--;
                }
            }

            SHAPE_LINE_CHAIN testChain = dst;

            testChain.Append( arc );
            testChain.Append( aSrc.Slice( last, std::max( last, aSrc.PointCount() - 3 ) ) );
            testChain.SetClosed( aSrc.IsClosed() );

            if( !testChain.SelfIntersectingWithArcs() )
            {
                // Add arc
                dst.Append( arc );

                APPROX_DBG( std::cout << " Add arc start " << arc.GetP0() << " mid "
                                      << arc.GetArcMid() << " end " << arc.GetP1() << std::endl );

                i = last + 3;
            }
            else
            {
                // Self-interference
                last = c_last_none;

                APPROX_DBG( std::cout << " Self-intersection check failed" << std::endl );
            }
        }

        if( last == c_last_none )
        {
            if( first < 0 )
                jEndIdx = first + aSrc.PointCount();

            // Add point
            dst.Append( p0 );
            APPROX_DBG( std::cout << " Add pt " << VECTOR2I( p0 ) << std::endl );
        }
    }

    dst.SetClosed( true );

    // Try to merge arcs
    int iarc0 = dst.ArcIndex( 0 );
    int iarc1 = dst.ArcIndex( dst.GetSegmentCount() - 1 );

    if( iarc0 != -1 && iarc1 != -1 )
    {
        APPROX_DBG( std::cout << "Final arcs " << iarc0 << " " << iarc1 << std::endl );

        if( iarc0 == iarc1 )
        {
            SHAPE_ARC arc = dst.Arc( iarc0 );

            VECTOR2D p0 = arc.GetP0();
            VECTOR2D p1 = arc.GetP1();

            // If we have only one arc and the gap is small, make it a circle
            if( ( p1 - p0 ).EuclideanNorm() < c_circleCloseGap )
            {
                dst.Clear();
                dst.Append( SHAPE_ARC( arc.GetCenter(), arc.GetP0(), ANGLE_360 ) );
            }
        }
        else
        {
            // Merge first and last arcs if they are similar
            SHAPE_ARC arc0 = dst.Arc( iarc0 );
            SHAPE_ARC arc1 = dst.Arc( iarc1 );

            VECTOR2D ac0 = arc0.GetCenter();
            VECTOR2D ac1 = arc1.GetCenter();

            double ar0 = arc0.GetRadius();
            double ar1 = arc1.GetRadius();

            if( std::abs( ar0 - ar1 ) <= c_radiusDeviation
                && ( ac0 - ac1 ).EuclideanNorm() <= c_arcCenterDeviation )
            {
                dst.RemoveShape( 0 );
                dst.RemoveShape( -1 );

                SHAPE_ARC merged( arc1.GetP0(), arc1.GetArcMid(), arc0.GetP1(), 0 );

                dst.Append( merged );
            }
        }
    }

    return dst;
}


static TopoDS_Shape getOneShape( Handle( XCAFDoc_ShapeTool ) aShapeTool )
{
    TDF_LabelSequence theLabels;
    aShapeTool->GetFreeShapes( theLabels );

    TopoDS_Shape aShape;

    if( theLabels.Length() == 1 )
        return aShapeTool->GetShape( theLabels.Value( 1 ) );

    TopoDS_Compound aCompound;
    BRep_Builder    aBuilder;
    aBuilder.MakeCompound( aCompound );

    for( TDF_LabelSequence::Iterator anIt( theLabels ); anIt.More(); anIt.Next() )
    {
        TopoDS_Shape aFreeShape;

        if( !aShapeTool->GetShape( anIt.Value(), aFreeShape ) )
            continue;

        aBuilder.Add( aCompound, aFreeShape );
    }

    if( aCompound.NbChildren() > 0 )
        aShape = aCompound;

    return aShape;
}


// Apply scaling to shapes within theLabel.
// Based on XCAFDoc_Editor::RescaleGeometry
static Standard_Boolean rescaleShapes( const TDF_Label& theLabel, const gp_XYZ& aScale )
{
    if( theLabel.IsNull() )
    {
        Message::SendFail( "Null label." );
        return Standard_False;
    }

    if( Abs( aScale.X() ) <= gp::Resolution() || Abs( aScale.Y() ) <= gp::Resolution()
        || Abs( aScale.Z() ) <= gp::Resolution() )
    {
        Message::SendFail( "Scale factor is too small." );
        return Standard_False;
    }

    Handle( XCAFDoc_ShapeTool ) aShapeTool = XCAFDoc_DocumentTool::ShapeTool( theLabel );
    if( aShapeTool.IsNull() )
    {
        Message::SendFail( "Couldn't find XCAFDoc_ShapeTool attribute." );
        return Standard_False;
    }

    Handle( KI_XCAFDoc_AssemblyGraph ) aG = new KI_XCAFDoc_AssemblyGraph( theLabel );
    if( aG.IsNull() )
    {
        Message::SendFail( "Couldn't create assembly graph." );
        return Standard_False;
    }

    Standard_Boolean anIsDone = Standard_True;

    // clang-format off
    gp_GTrsf aGTrsf;
    aGTrsf.SetVectorialPart( gp_Mat( aScale.X(), 0, 0,
                                     0, aScale.Y(), 0,
                                     0, 0, aScale.Z() ) );
    // clang-format on

    BRepBuilderAPI_GTransform aBRepTrsf( aGTrsf );

    for( Standard_Integer idx = 1; idx <= aG->NbNodes(); idx++ )
    {
        const KI_XCAFDoc_AssemblyGraph::NodeType aNodeType = aG->GetNodeType( idx );

        if( ( aNodeType != KI_XCAFDoc_AssemblyGraph::NodeType_Part )
            && ( aNodeType != KI_XCAFDoc_AssemblyGraph::NodeType_Occurrence ) )
        {
            continue;
        }

        const TDF_Label& aLabel = aG->GetNode( idx );

        if( aNodeType == KI_XCAFDoc_AssemblyGraph::NodeType_Part )
        {
            const TopoDS_Shape aShape = aShapeTool->GetShape( aLabel );
            aBRepTrsf.Perform( aShape, Standard_True );
            if( !aBRepTrsf.IsDone() )
            {
                Standard_SStream        aSS;
                TCollection_AsciiString anEntry;
                TDF_Tool::Entry( aLabel, anEntry );
                aSS << "Shape " << anEntry << " is not scaled!";
                Message::SendFail( aSS.str().c_str() );
                anIsDone = Standard_False;
                return Standard_False;
            }
            TopoDS_Shape aScaledShape = aBRepTrsf.Shape();
            aShapeTool->SetShape( aLabel, aScaledShape );

            // Update sub-shapes
            TDF_LabelSequence aSubshapes;
            aShapeTool->GetSubShapes( aLabel, aSubshapes );
            for( TDF_LabelSequence::Iterator anItSs( aSubshapes ); anItSs.More(); anItSs.Next() )
            {
                const TDF_Label&   aLSs = anItSs.Value();
                const TopoDS_Shape aSs = aShapeTool->GetShape( aLSs );
                const TopoDS_Shape aSs1 = aBRepTrsf.ModifiedShape( aSs );
                aShapeTool->SetShape( aLSs, aSs1 );
            }

            // These attributes will be recomputed eventually, but clear them just in case
            aLabel.ForgetAttribute( XCAFDoc_Area::GetID() );
            aLabel.ForgetAttribute( XCAFDoc_Centroid::GetID() );
            aLabel.ForgetAttribute( XCAFDoc_Volume::GetID() );
        }
        else if( aNodeType == KI_XCAFDoc_AssemblyGraph::NodeType_Occurrence )
        {
            TopLoc_Location aLoc = aShapeTool->GetLocation( aLabel );
            gp_Trsf         aTrsf = aLoc.Transformation();
            aTrsf.SetTranslationPart( aTrsf.TranslationPart().Multiplied( aScale ) );
            XCAFDoc_Location::Set( aLabel, aTrsf );
        }
    }

    if( !anIsDone )
    {
        return Standard_False;
    }

    aShapeTool->UpdateAssemblies();

    return anIsDone;
}


// Sets names in assembly to <aPrefix> (<old name>), or to <aPrefix>
static Standard_Boolean prefixNames( const TDF_Label&                  aLabel,
                                     const TCollection_ExtendedString& aPrefix )
{
    Handle( KI_XCAFDoc_AssemblyGraph ) aG = new KI_XCAFDoc_AssemblyGraph( aLabel );

    if( aG.IsNull() )
    {
        Message::SendFail( "Couldn't create assembly graph." );
        return Standard_False;
    }

    Standard_Boolean anIsDone = Standard_True;

    for( Standard_Integer idx = 1; idx <= aG->NbNodes(); idx++ )
    {
        const TDF_Label& lbl = aG->GetNode( idx );
        Handle( TDataStd_Name ) nameHandle;

        if( lbl.FindAttribute( TDataStd_Name::GetID(), nameHandle ) )
        {
            TCollection_ExtendedString name;

            name += aPrefix;
            name += " (";
            name += nameHandle->Get();
            name += ")";

            TDataStd_Name::Set( lbl, name );
        }
        else
        {
            TDataStd_Name::Set( lbl, aPrefix );
        }
    }

    return anIsDone;
}


STEP_PCB_MODEL::STEP_PCB_MODEL( const wxString& aPcbName )
{
    m_app = XCAFApp_Application::GetApplication();
    m_app->NewDocument( "MDTV-XCAF", m_doc );
    m_assy = XCAFDoc_DocumentTool::ShapeTool( m_doc->Main() );
    m_assy_label = m_assy->NewShape();
    m_hasPCB = false;
    m_components = 0;
    m_precision = USER_PREC;
    m_angleprec = USER_ANGLE_PREC;
    m_mergeOCCMaxDist = OCC_MAX_DISTANCE_TO_MERGE_POINTS;
    m_minx = 1.0e10;    // absurdly large number; any valid PCB X value will be smaller
    m_pcbName = aPcbName;
    m_maxError = pcbIUScale.mmToIU( ARC_TO_SEGMENT_MAX_ERROR_MM );
    m_fuseShapes = false;

    // TODO: make configurable
    m_platingThickness = pcbIUScale.mmToIU( 0.025 );
}


STEP_PCB_MODEL::~STEP_PCB_MODEL()
{
    if( m_doc->CanClose() == CDM_CCS_OK )
        m_doc->Close();
}


bool STEP_PCB_MODEL::AddPadShape( const PAD* aPad, const VECTOR2D& aOrigin, bool aVia )
{
    bool success = true;

    for( PCB_LAYER_ID pcb_layer : aPad->GetLayerSet().Seq() )
    {
        if( !IsCopperLayer( pcb_layer ) )
            continue;

        if( !m_enabledLayers.Contains( pcb_layer ) )
            continue;

        TopoDS_Shape curr_shape;

        double Zpos, thickness;
        getLayerZPlacement( pcb_layer, Zpos, thickness );

        if( !aVia )
        {
            // Pad surface as a separate face for FEM simulations.
            if( pcb_layer == F_Cu )
                thickness += 0.01;
            else if( pcb_layer == B_Cu )
                thickness -= 0.01;
        }

        TopoDS_Shape testShape;

        // Make a shape on copper layers
        std::shared_ptr<SHAPE> effShapePtr = aPad->GetEffectiveShape( pcb_layer );

        wxCHECK( effShapePtr->Type() == SHAPE_TYPE::SH_COMPOUND, false );
        SHAPE_COMPOUND* compoundShape = static_cast<SHAPE_COMPOUND*>( effShapePtr.get() );

        std::vector<TopoDS_Shape> topodsShapes;

        for( SHAPE* shape : compoundShape->Shapes() )
        {
            if( shape->Type() == SHAPE_TYPE::SH_SEGMENT || shape->Type() == SHAPE_TYPE::SH_CIRCLE )
            {
                VECTOR2I start, end;
                int      width = 0;

                if( shape->Type() == SHAPE_TYPE::SH_SEGMENT )
                {
                    SHAPE_SEGMENT* sh_seg = static_cast<SHAPE_SEGMENT*>( shape );

                    start = sh_seg->GetSeg().A;
                    end = sh_seg->GetSeg().B;
                    width = sh_seg->GetWidth();
                }
                else if( shape->Type() == SHAPE_TYPE::SH_CIRCLE )
                {
                    SHAPE_CIRCLE* sh_circ = static_cast<SHAPE_CIRCLE*>( shape );

                    start = end = sh_circ->GetCenter();
                    width = sh_circ->GetRadius() * 2;
                }

                TopoDS_Shape topods_shape;

                if( MakeShapeAsThickSegment( topods_shape, start, end, width, thickness, Zpos,
                                             aOrigin ) )
                {
                    topodsShapes.emplace_back( topods_shape );

                    if( testShape.IsNull() )
                    {
                        MakeShapeAsThickSegment( testShape, start, end, width, 0.0,
                                                 Zpos + thickness, aOrigin );
                    }
                }
                else
                {
                    success = false;
                }
            }
            else
            {
                SHAPE_POLY_SET polySet;
                shape->TransformToPolygon( polySet, ARC_HIGH_DEF, ERROR_INSIDE );

                success &= MakeShapes( topodsShapes, polySet, false, thickness, Zpos, aOrigin );

                if( testShape.IsNull() )
                {
                    std::vector<TopoDS_Shape> testShapes;

                    MakeShapes( testShapes, polySet, false, 0.0, Zpos + thickness, aOrigin );

                    if( testShapes.size() > 0 )
                        testShape = testShapes.front();
                }
            }
        }

        // Fuse shapes
        if( topodsShapes.size() == 1 )
        {
            m_board_copper_pads.emplace_back( topodsShapes.front() );
        }
        else
        {
            BRepAlgoAPI_Fuse     mkFuse;
            TopTools_ListOfShape shapeArguments, shapeTools;

            for( TopoDS_Shape& sh : topodsShapes )
            {
                if( sh.IsNull() )
                    continue;

                if( shapeArguments.IsEmpty() )
                    shapeArguments.Append( sh );
                else
                    shapeTools.Append( sh );
            }

            mkFuse.SetRunParallel( true );
            mkFuse.SetToFillHistory( false );
            mkFuse.SetArguments( shapeArguments );
            mkFuse.SetTools( shapeTools );
            mkFuse.Build();

            if( mkFuse.IsDone() )
            {
                TopoDS_Shape fusedShape = mkFuse.Shape();

                ShapeUpgrade_UnifySameDomain unify( fusedShape, true, true, false );
                unify.History() = nullptr;
                unify.Build();

                TopoDS_Shape unifiedShapes = unify.Shape();

                if( !unifiedShapes.IsNull() )
                {
                    m_board_copper_pads.emplace_back( unifiedShapes );
                }
                else
                {
                    ReportMessage(
                            _( "** ShapeUpgrade_UnifySameDomain produced a null shape **\n" ) );
                    m_board_copper_pads.emplace_back( fusedShape );
                }
            }
            else
            {
                for( TopoDS_Shape& sh : topodsShapes )
                    m_board_copper_pads.emplace_back( sh );
            }
        }

        if( !aVia && !testShape.IsNull() )
        {
            if( pcb_layer == F_Cu || pcb_layer == B_Cu )
            {
                wxString name;

                name << "Pad_";

                if( pcb_layer == F_Cu )
                    name << 'F' << '_';
                else if( pcb_layer == B_Cu )
                    name << 'B' << '_';

                name << aPad->GetParentFootprint()->GetReferenceAsString() << '_'
                     << aPad->GetNumber() << '_' << aPad->GetShortNetname();

                gp_Pnt point( pcbIUScale.IUTomm( aPad->GetX() - aOrigin.x ),
                              -pcbIUScale.IUTomm( aPad->GetY() - aOrigin.y ), Zpos + thickness );

                m_pad_points[name] = { point, testShape };
            }
        }
    }

    if( aPad->GetAttribute() == PAD_ATTRIB::PTH && aPad->IsOnLayer( F_Cu )
        && aPad->IsOnLayer( B_Cu ) )
    {
        double f_pos, f_thickness;
        double b_pos, b_thickness;
        getLayerZPlacement( F_Cu, f_pos, f_thickness );
        getLayerZPlacement( B_Cu, b_pos, b_thickness );
        double top = std::max( f_pos, f_pos + f_thickness );
        double bottom = std::min( b_pos, b_pos + b_thickness );

        TopoDS_Shape plating;

        std::shared_ptr<SHAPE_SEGMENT> seg_hole = aPad->GetEffectiveHoleShape();
        double width = std::min( aPad->GetDrillSize().x, aPad->GetDrillSize().y );

        if( MakeShapeAsThickSegment( plating, seg_hole->GetSeg().A, seg_hole->GetSeg().B, width,
                                     ( top - bottom ), bottom, aOrigin ) )
        {
            m_board_copper_pads.push_back( plating );
        }
        else
        {
            success = false;
        }
    }

    if( !success )  // Error
        ReportMessage( wxT( "OCC error adding pad/via polygon.\n" ) );

    return success;
}


bool STEP_PCB_MODEL::AddViaShape( const PCB_VIA* aVia, const VECTOR2D& aOrigin )
{
    // A via is very similar to a round pad. So, for now, used AddPadHole() to
    // create a via+hole shape
    PAD dummy( nullptr );
    int hole = aVia->GetDrillValue();
    dummy.SetDrillSize( VECTOR2I( hole, hole ) );
    dummy.SetPosition( aVia->GetStart() );
    dummy.SetSize( VECTOR2I( aVia->GetWidth(), aVia->GetWidth() ) );

    if( AddPadHole( &dummy, aOrigin ) )
    {
        if( !AddPadShape( &dummy, aOrigin, true ) )
            return false;
    }

    return true;
}


bool STEP_PCB_MODEL::AddTrackSegment( const PCB_TRACK* aTrack, const VECTOR2D& aOrigin )
{
    PCB_LAYER_ID pcblayer = aTrack->GetLayer();

    if( !m_enabledLayers.Contains( pcblayer ) )
        return true;

    TopoDS_Shape shape;

    double zposition, thickness;
    getLayerZPlacement( pcblayer, zposition, thickness );

    bool success = MakeShapeAsThickSegment( shape, aTrack->GetStart(), aTrack->GetEnd(),
                                            aTrack->GetWidth(), thickness, zposition, aOrigin );

    if( success )
        m_board_copper_tracks.push_back( shape );

    return success;
}


void STEP_PCB_MODEL::getLayerZPlacement( const PCB_LAYER_ID aLayer, double& aZPos,
                                         double& aThickness )
{
    // Offsets above copper in mm
    static const double c_silkscreenAboveCopper = 0.04;
    static const double c_soldermaskAboveCopper = 0.015;

    if( IsCopperLayer( aLayer ) )
    {
        getCopperLayerZPlacement( aLayer, aZPos, aThickness );
    }
    else if( IsFrontLayer( aLayer ) )
    {
        double f_pos, f_thickness;
        getCopperLayerZPlacement( F_Cu, f_pos, f_thickness );
        double top = std::max( f_pos, f_pos + f_thickness );

        if( aLayer == F_SilkS )
            aZPos = top + c_silkscreenAboveCopper;
        else
            aZPos = top + c_soldermaskAboveCopper;

        aThickness = 0.0; // Normal points up
    }
    else if( IsBackLayer( aLayer ) )
    {
        double b_pos, b_thickness;
        getCopperLayerZPlacement( B_Cu, b_pos, b_thickness );
        double bottom = std::min( b_pos, b_pos + b_thickness );

        if( aLayer == B_SilkS )
            aZPos = bottom - c_silkscreenAboveCopper;
        else
            aZPos = bottom - c_soldermaskAboveCopper;

        aThickness = -0.0; // Normal points down
    }
}


void STEP_PCB_MODEL::getCopperLayerZPlacement( const PCB_LAYER_ID aLayer, double& aZPos,
                                               double& aThickness )
{
    int  z = 0;
    int  thickness = 0;
    bool wasPrepreg = false;

    const std::vector<BOARD_STACKUP_ITEM*>& materials = m_stackup.GetList();

    // Iterate from bottom to top
    for( auto it = materials.rbegin(); it != materials.rend(); ++it )
    {
        const BOARD_STACKUP_ITEM* item = *it;

        if( item->GetType() == BS_ITEM_TYPE_COPPER )
        {
            if( aLayer == B_Cu )
            {
                // This is the first encountered layer
                thickness = -item->GetThickness();
                break;
            }

            // Inner copper position is usually inside prepreg
            if( wasPrepreg && item->GetBrdLayerId() != F_Cu )
                thickness = -item->GetThickness();
            else
                thickness = item->GetThickness();

            if( item->GetBrdLayerId() == aLayer )
                break;

            if( item->GetBrdLayerId() != B_Cu )
                z += item->GetThickness();
        }
        else if( item->GetType() == BS_ITEM_TYPE_DIELECTRIC )
        {
            wasPrepreg = ( item->GetTypeName() == KEY_PREPREG );

            // Dielectric can have sub-layers. Layer 0 is the main layer
            // Not frequent, but possible
            thickness = 0;
            for( int idx = 0; idx < item->GetSublayersCount(); idx++ )
                thickness += item->GetThickness( idx );

            z += thickness;
        }
    }

    aZPos = pcbIUScale.IUTomm( z );
    aThickness = pcbIUScale.IUTomm( thickness );
}


void STEP_PCB_MODEL::getBoardBodyZPlacement( double& aZPos, double& aThickness )
{
    double f_pos, f_thickness;
    double b_pos, b_thickness;
    getLayerZPlacement( F_Cu, f_pos, f_thickness );
    getLayerZPlacement( B_Cu, b_pos, b_thickness );
    double top = std::min( f_pos, f_pos + f_thickness );
    double bottom = std::max( b_pos, b_pos + b_thickness );

    aThickness = ( top - bottom );
    aZPos = bottom;

    wxASSERT( aZPos == 0.0 );
}


bool STEP_PCB_MODEL::AddCopperPolygonShapes( const SHAPE_POLY_SET* aPolyShapes, PCB_LAYER_ID aLayer,
                                             const VECTOR2D& aOrigin, bool aTrack )
{
    bool success = true;

    if( aPolyShapes->IsEmpty() )
        return true;

    if( !m_enabledLayers.Contains( aLayer ) )
        return true;

    double z_pos, thickness;
    getLayerZPlacement( aLayer, z_pos, thickness );

    if( !MakeShapes( aTrack ? m_board_copper_tracks : m_board_copper_zones, *aPolyShapes, true,
                     thickness, z_pos, aOrigin ) )
    {
        ReportMessage(
                wxString::Format( wxT( "Could not add shape (%d points) to copper layer on %s.\n" ),
                                  aPolyShapes->FullPointCount(), LayerName( aLayer ) ) );

        success = false;
    }

    return success;
}


bool STEP_PCB_MODEL::AddPadHole( const PAD* aPad, const VECTOR2D& aOrigin )
{
    if( aPad == nullptr || !aPad->GetDrillSize().x )
        return false;

    const double margin = 0.01; // a small margin on the Z axix to be sure the hole
                                // is bigger than the board with copper
                                // must be > OCC_MAX_DISTANCE_TO_MERGE_POINTS

    double f_pos, f_thickness;
    double b_pos, b_thickness;
    getLayerZPlacement( F_Cu, f_pos, f_thickness );
    getLayerZPlacement( B_Cu, b_pos, b_thickness );
    double top = std::max( f_pos, f_pos + f_thickness );
    double bottom = std::min( b_pos, b_pos + b_thickness );

    double holeZsize = ( top - bottom ) + ( margin * 2 );

    std::shared_ptr<SHAPE_SEGMENT> seg_hole = aPad->GetEffectiveHoleShape();

    double boardDrill = std::min( aPad->GetDrillSize().x, aPad->GetDrillSize().y );

    int    platingThickness = aPad->GetAttribute() == PAD_ATTRIB::PTH ? m_platingThickness : 0;
    double copperDrill = boardDrill - platingThickness * 2;

    TopoDS_Shape copperHole, boardHole;

    if( MakeShapeAsThickSegment( copperHole, seg_hole->GetSeg().A, seg_hole->GetSeg().B,
                                 copperDrill, holeZsize, bottom - margin, aOrigin ) )
    {
        m_copperCutouts.push_back( copperHole );
    }
    else
    {
        return false;
    }

    if( MakeShapeAsThickSegment( boardHole, seg_hole->GetSeg().A, seg_hole->GetSeg().B, boardDrill,
                                 holeZsize, bottom - margin, aOrigin ) )
    {
        m_boardCutouts.push_back( boardHole );
    }
    else
    {
        return false;
    }

    return true;
}


bool STEP_PCB_MODEL::AddComponent( const std::string& aFileNameUTF8, const std::string& aRefDes,
                             bool aBottom, VECTOR2D aPosition, double aRotation, VECTOR3D aOffset,
                             VECTOR3D aOrientation, VECTOR3D aScale, bool aSubstituteModels )
{
    if( aFileNameUTF8.empty() )
    {
        ReportMessage( wxString::Format( wxT( "No model defined for component %s.\n" ), aRefDes ) );
        return false;
    }

    wxString fileName( wxString::FromUTF8( aFileNameUTF8.c_str() ) );
    ReportMessage( wxString::Format( wxT( "Add component %s.\n" ), aRefDes ) );

    // first retrieve a label
    TDF_Label lmodel;
    wxString  errorMessage;

    if( !getModelLabel( aFileNameUTF8, aScale, lmodel, aSubstituteModels, &errorMessage ) )
    {
        if( errorMessage.IsEmpty() )
            ReportMessage( wxString::Format( wxT( "No model for filename '%s'.\n" ), fileName ) );
        else
            ReportMessage( errorMessage );

        return false;
    }

    // calculate the Location transform
    TopLoc_Location toploc;

    if( !getModelLocation( aBottom, aPosition, aRotation, aOffset, aOrientation, toploc ) )
    {
        ReportMessage(
                wxString::Format( wxT( "No location data for filename '%s'.\n" ), fileName ) );
        return false;
    }

    // add the located sub-assembly
    TDF_Label llabel = m_assy->AddComponent( m_assy_label, lmodel, toploc );

    if( llabel.IsNull() )
    {
        ReportMessage( wxString::Format( wxT( "Could not add component with filename '%s'.\n" ),
                                         fileName ) );
        return false;
    }

    // attach the RefDes name
    TCollection_ExtendedString refdes( aRefDes.c_str() );
    TDataStd_Name::Set( llabel, refdes );

    return true;
}


void STEP_PCB_MODEL::SetEnabledLayers( const LSET& aLayers )
{
    m_enabledLayers = aLayers;
}


void STEP_PCB_MODEL::SetFuseShapes( bool aValue )
{
    m_fuseShapes = aValue;
}


void STEP_PCB_MODEL::SetStackup( const BOARD_STACKUP& aStackup )
{
    m_stackup = aStackup;
}


void STEP_PCB_MODEL::SetNetFilter( const wxString& aFilter )
{
    m_netFilter = aFilter;
}


void STEP_PCB_MODEL::SetBoardColor( double r, double g, double b )
{
    m_boardColor[0] = r;
    m_boardColor[1] = g;
    m_boardColor[2] = b;
}


void STEP_PCB_MODEL::SetCopperColor( double r, double g, double b )
{
    m_copperColor[0] = r;
    m_copperColor[1] = g;
    m_copperColor[2] = b;
}


void STEP_PCB_MODEL::OCCSetMergeMaxDistance( double aDistance )
{
    // Ensure a minimal value (in mm)
    m_mergeOCCMaxDist = aDistance;
}


bool STEP_PCB_MODEL::isBoardOutlineValid()
{
    return m_pcb_labels.size() > 0;
}


// A helper function to know if a SHAPE_LINE_CHAIN is encoding a circle (now unused)
#if 0
static bool IsChainCircle( const SHAPE_LINE_CHAIN& aChain )
{
    // If aChain is a circle it
    // - contains only one arc
    // - this arc has the same start and end point
    const std::vector<SHAPE_ARC>& arcs = aChain.CArcs();

    if( arcs.size() == 1 )
    {
        const SHAPE_ARC& arc = arcs[0];

        if( arc. GetP0() == arc.GetP1() )
            return true;
    }

    return false;
}
#endif


bool STEP_PCB_MODEL::MakeShapeAsCylinder( TopoDS_Shape& aShape,
                                          const SHAPE_LINE_CHAIN& aChain, double aThickness,
                                          double aZposition, const VECTOR2D& aOrigin )
{
    if( !aShape.IsNull() )
        return false; // there is already data in the shape object

    if( !aChain.IsClosed() )
        return false; // the loop is not closed

    const std::vector<SHAPE_ARC>& arcs = aChain.CArcs();
    const SHAPE_ARC& arc = arcs[0];

    TopoDS_Shape base_shape;
    base_shape = BRepPrimAPI_MakeCylinder(
                        pcbIUScale.IUTomm( arc.GetRadius() ), aThickness ).Shape();
    gp_Trsf shift;
    shift.SetTranslation( gp_Vec( pcbIUScale.IUTomm( arc.GetCenter().x - aOrigin.x ),
                                  -pcbIUScale.IUTomm( arc.GetCenter().y - aOrigin.y ),
                                  aZposition ) );
    BRepBuilderAPI_Transform round_shape( base_shape, shift );
    aShape = round_shape;

    if( aShape.IsNull() )
    {
        ReportMessage( wxT( "failed to create a cylinder vertical shape\n" ) );
        return false;
    }

    return true;
}


bool STEP_PCB_MODEL::MakeShapeAsThickSegment( TopoDS_Shape& aShape,
                                              VECTOR2D aStartPoint, VECTOR2D aEndPoint,
                                              double aWidth, double aThickness,
                                              double aZposition, const VECTOR2D& aOrigin )
{
    // make a wide segment from 2 lines and 2 180 deg arcs
    // We need 6 points (3 per arcs)
    VECTOR2D coords[6];

    // We build a horizontal segment, and after rotate it
    double len = ( aEndPoint - aStartPoint ).EuclideanNorm();
    double h_width = aWidth/2.0;
    // First is end point of first arc, and also start point of first line
    coords[0] = VECTOR2D{ 0.0, h_width };

    // end  point of first line and start point of second arc
    coords[1] = VECTOR2D{ len, h_width };

    // middle point of second arc
    coords[2] = VECTOR2D{ len + h_width, 0.0 };

    // start point of second line and end point of second arc
    coords[3] = VECTOR2D{ len, -h_width };

    // end point of second line and start point of first arc
    coords[4] = VECTOR2D{ 0, -h_width };

    // middle point of first arc
    coords[5] = VECTOR2D{ -h_width, 0.0 };

    // Rotate and move to segment position
    EDA_ANGLE seg_angle( aEndPoint - aStartPoint );

    for( int ii = 0; ii < 6; ii++ )
    {
        RotatePoint( coords[ii], VECTOR2D{ 0, 0 }, -seg_angle ),
        coords[ii] += aStartPoint;
    }


    // Convert to 3D points
    gp_Pnt coords3D[ 6 ];

    for( int ii = 0; ii < 6; ii++ )
    {
        coords3D[ii] = gp_Pnt( pcbIUScale.IUTomm( coords[ii].x - aOrigin.x ),
                               -pcbIUScale.IUTomm( coords[ii].y - aOrigin.y ), aZposition );
    }

    // Build OpenCascade shape outlines
    BRepBuilderAPI_MakeWire wire;
    bool success = true;

    // Short segments (distance between end points < m_mergeOCCMaxDist(in mm)) must be
    // skipped because OCC merge end points, and a null shape is created
    bool short_seg = pcbIUScale.IUTomm( len ) <= m_mergeOCCMaxDist;

    try
    {
        TopoDS_Edge edge;

        if( short_seg )
        {
            Handle( Geom_Circle ) circle = GC_MakeCircle( coords3D[1], // arc1 start point
                                                          coords3D[2], // arc1 mid point
                                                          coords3D[5]  // arc2 mid point
            );

            edge = BRepBuilderAPI_MakeEdge( circle );
            wire.Add( edge );
        }
        else
        {
            edge = BRepBuilderAPI_MakeEdge( coords3D[0], coords3D[1] );
            wire.Add( edge );

            Handle( Geom_TrimmedCurve ) arcOfCircle =
                    GC_MakeArcOfCircle( coords3D[1], // start point
                                        coords3D[2], // mid point
                                        coords3D[3]  // end point
                    );
            edge = BRepBuilderAPI_MakeEdge( arcOfCircle );
            wire.Add( edge );

            edge = BRepBuilderAPI_MakeEdge( coords3D[3], coords3D[4] );
            wire.Add( edge );

            Handle( Geom_TrimmedCurve ) arcOfCircle2 =
                    GC_MakeArcOfCircle( coords3D[4], // start point
                                        coords3D[5], // mid point
                                        coords3D[0]  // end point
                    );
            edge = BRepBuilderAPI_MakeEdge( arcOfCircle2 );
            wire.Add( edge );
        }
    }
    catch( const Standard_Failure& e )
    {
        ReportMessage( wxString::Format( wxT( "build shape segment: OCC exception: %s\n" ),
                                         e.GetMessageString() ) );
        return false;
    }


    BRepBuilderAPI_MakeFace face;

    try
    {
        gp_Pln plane( coords3D[0], gp::DZ() );
        face = BRepBuilderAPI_MakeFace( plane, wire );
    }
    catch( const Standard_Failure& e )
    {
        ReportMessage( wxString::Format( wxT( "MakeShapeThickSegment: OCC exception: %s\n" ),
                                         e.GetMessageString() ) );
        return false;
    }

    if( aThickness != 0.0 )
    {
        aShape = BRepPrimAPI_MakePrism( face, gp_Vec( 0, 0, aThickness ) );

        if( aShape.IsNull() )
        {
            ReportMessage( wxT( "failed to create a prismatic shape\n" ) );
            return false;
        }
    }
    else
    {
        aShape = face;
    }

    return success;
}


static wxString formatBBox( const BOX2I& aBBox )
{
    wxString       str;
    UNITS_PROVIDER up( pcbIUScale, EDA_UNITS::MILLIMETRES );

    str << "x0: " << up.StringFromValue( aBBox.GetLeft(), false ) << "; ";
    str << "y0: " << up.StringFromValue( aBBox.GetTop(), false ) << "; ";
    str << "x1: " << up.StringFromValue( aBBox.GetRight(), false ) << "; ";
    str << "y1: " << up.StringFromValue( aBBox.GetBottom(), false );

    return str;
}


bool STEP_PCB_MODEL::MakeShapes( std::vector<TopoDS_Shape>& aShapes, const SHAPE_POLY_SET& aPolySet, bool aConvertToArcs,
                                 double aThickness, double aZposition, const VECTOR2D& aOrigin )
{
    SHAPE_POLY_SET simplified = aPolySet;
    simplified.Simplify( SHAPE_POLY_SET::PM_STRICTLY_SIMPLE );

    auto toPoint = [&]( const VECTOR2D& aKiCoords ) -> gp_Pnt
    {
        return gp_Pnt( pcbIUScale.IUTomm( aKiCoords.x - aOrigin.x ),
                       -pcbIUScale.IUTomm( aKiCoords.y - aOrigin.y ), aZposition );
    };

    gp_Pln basePlane( gp_Pnt( 0.0, 0.0, aZposition ), gp::DZ() );

    for( const SHAPE_POLY_SET::POLYGON& polygon : simplified.CPolygons() )
    {
        auto makeWireFromChain = [&]( BRepLib_MakeWire&       aMkWire,
                                      const SHAPE_LINE_CHAIN& aChain ) -> bool
        {
            try
            {
                auto addSegment = [&]( const VECTOR2I& aPt0, const VECTOR2I& aPt1 ) -> bool
                {
                    if( aPt0 == aPt1 )
                        return false;

                    gp_Pnt start = toPoint( aPt0 );
                    gp_Pnt end = toPoint( aPt1 );

                    BRepBuilderAPI_MakeEdge mkEdge( start, end );

                    if( !mkEdge.IsDone() || mkEdge.Edge().IsNull() )
                    {
                        ReportMessage( wxString::Format( wxT( "failed to make segment edge at (%d "
                                                              "%d) -> (%d %d), skipping\n" ),
                                                         aPt0.x, aPt0.y, aPt1.x, aPt1.y ) );
                    }
                    else
                    {
                        aMkWire.Add( mkEdge.Edge() );

                        if( aMkWire.Error() != BRepLib_WireDone )
                        {
                            ReportMessage( wxString::Format( wxT( "failed to add segment edge "
                                                                  "at (%d %d) -> (%d %d)\n" ),
                                                             aPt0.x, aPt0.y, aPt1.x, aPt1.y ) );
                            return false;
                        }
                    }

                    return true;
                };

                auto addArc = [&]( const VECTOR2I& aPt0, const SHAPE_ARC& aArc ) -> bool
                {
                    // Do not export too short segments: they create broken shape because OCC thinks
                    Handle( Geom_Curve ) curve;

                    if( aArc.GetCentralAngle() == ANGLE_360 )
                    {
                        gp_Ax2 axis = gp::XOY();
                        axis.SetLocation( toPoint( aArc.GetCenter() ) );

                        curve = GC_MakeCircle( axis, pcbIUScale.IUTomm( aArc.GetRadius() ) )
                                        .Value();
                    }
                    else
                    {
                        curve = GC_MakeArcOfCircle( toPoint( aPt0 ), toPoint( aArc.GetArcMid() ),
                                                    toPoint( aArc.GetP1() ) )
                                        .Value();
                    }

                    if( curve.IsNull() )
                        return false;

                    aMkWire.Add( BRepBuilderAPI_MakeEdge( curve ) );

                    if( !aMkWire.IsDone() )
                    {
                        ReportMessage( wxString::Format(
                                wxT( "failed to add arc curve from (%d %d), arc p0 "
                                     "(%d %d), mid (%d %d), p1 (%d %d)\n" ),
                                aPt0.x, aPt0.y, aArc.GetP0().x, aArc.GetP0().y, aArc.GetArcMid().x,
                                aArc.GetArcMid().y, aArc.GetP1().x, aArc.GetP1().y ) );
                        return false;
                    }

                    return true;
                };

                VECTOR2I firstPt;
                VECTOR2I lastPt;
                bool     isFirstShape = true;

                for( int i = 0; i <= aChain.PointCount() && i != -1; i = aChain.NextShape( i ) )
                {
                    if( i == 0 )
                    {
                        if( aChain.IsArcSegment( 0 )
                            && aChain.IsArcSegment( aChain.PointCount() - 1 )
                            && aChain.ArcIndex( 0 ) == aChain.ArcIndex( aChain.PointCount() - 1 ) )
                        {
                            // Skip first arc (we should encounter it later)
                            int nextShape = aChain.NextShape( i );

                            // If nextShape points to the end, then we have a circle.
                            if( nextShape != -1 )
                                i = nextShape;
                        }
                    }

                    if( isFirstShape )
                        lastPt = aChain.CPoint( i );

                    bool isArc = aChain.IsArcSegment( i );

                    if( aChain.IsArcStart( i ) )
                    {
                        const SHAPE_ARC& currentArc = aChain.Arc( aChain.ArcIndex( i ) );

                        if( isFirstShape )
                        {
                            firstPt = currentArc.GetP0();
                            lastPt = firstPt;
                        }

                        if( addSegment( lastPt, currentArc.GetP0() ) )
                            lastPt = currentArc.GetP0();

                        if( addArc( lastPt, currentArc ) )
                            lastPt = currentArc.GetP1();
                    }
                    else if( !isArc )
                    {
                        const SEG& seg = aChain.CSegment( i );

                        if( isFirstShape )
                        {
                            firstPt = seg.A;
                            lastPt = firstPt;
                        }

                        if( addSegment( lastPt, seg.A ) )
                            lastPt = seg.A;

                        if( addSegment( lastPt, seg.B ) )
                            lastPt = seg.B;
                    }

                    isFirstShape = false;
                }

                if( lastPt != firstPt && !addSegment( lastPt, firstPt ) )
                {
                    ReportMessage( wxString::Format(
                            wxT( "** Failed to close wire at %d, %d -> %d, %d **\n" ), lastPt.x,
                            lastPt.y, firstPt.x, firstPt.y ) );

                    return false;
                }
            }
            catch( const Standard_Failure& e )
            {
                ReportMessage( wxString::Format( wxT( "makeWireFromChain: OCC exception: %s\n" ),
                                                 e.GetMessageString() ) );
                return false;
            }

            return true;
        };

        auto tryMakeWire = [&makeWireFromChain,
                            &aZposition]( const SHAPE_LINE_CHAIN& aContour ) -> TopoDS_Wire
        {
            TopoDS_Wire      wire;
            BRepLib_MakeWire mkWire;

            makeWireFromChain( mkWire, aContour );

            if( mkWire.IsDone() )
            {
                wire = mkWire.Wire();
            }
            else
            {
                ReportMessage(
                        wxString::Format( _( "Wire not done (contour points %d): OCC error %d\n" ),
                                          static_cast<int>( aContour.PointCount() ),
                                          static_cast<int>( mkWire.Error() ) ) );

                ReportMessage( wxString::Format( _( "z: %g; bounding box: %s\n" ), aZposition,
                                                 formatBBox( aContour.BBox() ) ) );
            }

            if( !wire.IsNull() )
            {
                BRepAlgoAPI_Check check( wire, false, true );

                if( !check.IsValid() )
                {
                    ReportMessage( wxString::Format( _( "\nWire self-interference check "
                                                        "failed\n" ) ) );

                    ReportMessage( wxString::Format( _( "z: %g; bounding box: %s\n" ), aZposition,
                                                     formatBBox( aContour.BBox() ) ) );

                    wire.Nullify();
                }
            }

            return wire;
        };

        BRepBuilderAPI_MakeFace mkFace;

        for( size_t contId = 0; contId < polygon.size(); contId++ )
        {
            try
            {
                TopoDS_Wire wire;

                // Try to approximate the polygon with arcs first
                if( aConvertToArcs )
                    wire = tryMakeWire( approximateLineChainWithArcs( polygon[contId] ) );

                // Fall back to original shape
                if( wire.IsNull() )
                {
                    wire = tryMakeWire( polygon[contId] );

                    if( aConvertToArcs && !wire.IsNull() )
                        ReportMessage( wxString::Format( _( "Using non-simplified polygon.\n" ) ) );
                }

                if( contId == 0 ) // Outline
                {
                    if( !wire.IsNull() )
                    {
                        mkFace = BRepBuilderAPI_MakeFace( basePlane, wire );
                    }
                    else
                    {
                        ReportMessage( wxString::Format( wxT( "\n** Outline skipped **\n" ) ) );

                        ReportMessage( wxString::Format( wxT( "z: %g; bounding box: %s\n" ),
                                                         aZposition,
                                                         formatBBox( polygon[contId].BBox() ) ) );

                        break;
                    }
                }
                else // Hole
                {
                    if( !wire.IsNull() )
                    {
                        wire.Reverse();

                        mkFace.Add( wire );
                    }
                    else
                    {
                        ReportMessage( wxString::Format( wxT( "\n** Hole skipped **\n" ) ) );

                        ReportMessage( wxString::Format( wxT( "z: %g; bounding box: %s\n" ),
                                                         aZposition,
                                                         formatBBox( polygon[contId].BBox() ) ) );
                    }
                }
            }
            catch( const Standard_Failure& e )
            {
                ReportMessage(
                        wxString::Format( wxT( "MakeShapes (contour %d): OCC exception: %s\n" ),
                                          static_cast<int>( contId ), e.GetMessageString() ) );
                return false;
            }
        }

        if( mkFace.IsDone() )
        {
            if( aThickness != 0.0 )
            {
                TopoDS_Shape prism = BRepPrimAPI_MakePrism( mkFace, gp_Vec( 0, 0, aThickness ) );
                aShapes.push_back( prism );

                if( prism.IsNull() )
                {
                    ReportMessage( wxT( "Failed to create a prismatic shape\n" ) );
                    return false;
                }
            }
            else
            {
                aShapes.push_back( mkFace );
            }
        }
        else
        {
            wxASSERT( false );
            return false;
        }
    }

    return true;
}


bool STEP_PCB_MODEL::CreatePCB( SHAPE_POLY_SET& aOutline, VECTOR2D aOrigin, bool aPushBoardBody )
{
    if( m_hasPCB )
    {
        if( !isBoardOutlineValid() )
            return false;

        return true;
    }

    Handle( XCAFDoc_ColorTool ) colorTool = XCAFDoc_DocumentTool::ColorTool( m_doc->Main() );
    m_hasPCB = true; // whether or not operations fail we note that CreatePCB has been invoked

    // Support for more than one main outline (more than one board)
    ReportMessage( wxString::Format( wxT( "Build board outlines (%d outlines) with %d points.\n" ),
                                     aOutline.OutlineCount(), aOutline.FullPointCount() ) );

    double boardThickness;
    double boardZPos;
    getBoardBodyZPlacement( boardZPos, boardThickness );

#if 1
    // This code should work, and it is working most of time
    // However there are issues if the main outline is a circle with holes:
    // holes from vias and pads are not working
    // see bug https://gitlab.com/kicad/code/kicad/-/issues/17446
    // (Holes are missing from STEP export with circular PCB outline)
    // Hard to say if the bug is in our code or in OCC 7.7
    if( !MakeShapes( m_board_outlines, aOutline, false, boardThickness, boardZPos, aOrigin ) )
    {
        // Error
        ReportMessage( wxString::Format(
                wxT( "OCC error creating main outline.\n" ) ) );
    }
#else
    // Workaround for bug #17446 Holes are missing from STEP export with circular PCB outline
    for( const SHAPE_POLY_SET::POLYGON& polygon : aOutline.CPolygons() )
    {
        for( size_t contId = 0; contId < polygon.size(); contId++ )
        {
            const SHAPE_LINE_CHAIN& contour = polygon[contId];
            SHAPE_POLY_SET          polyset;
            polyset.Append( contour );

            if( contId == 0 ) // main Outline
            {
                if( !MakeShapes( m_board_outlines, polyset, false, boardThickness, boardZPos,
                                 aOrigin ) )
                {
                    ReportMessage( wxT( "OCC error creating main outline.\n" ) );
                }
            }
            else // Hole inside the main outline
            {
                if( !MakeShapes( m_boardCutouts, polyset, false, boardThickness, boardZPos,
                                 aOrigin ) )
                {
                    ReportMessage( wxT( "OCC error creating hole in main outline.\n" ) );
                }
            }
        }
    }
#endif

    // Even if we've disabled board body export, we still need the shapes for bounding box calculations.
    Bnd_Box brdBndBox;

    for( const TopoDS_Shape& brdShape : m_board_outlines )
        BRepBndLib::Add( brdShape, brdBndBox );

    // subtract cutouts (if any)
    ReportMessage( wxString::Format( wxT( "Build board cutouts and holes (%d hole(s)).\n" ),
                                     (int) ( m_boardCutouts.size() + m_copperCutouts.size() ) ) );

    auto buildBSB = [&brdBndBox]( std::vector<TopoDS_Shape>& input, Bnd_BoundSortBox& bsbHoles )
    {
        // We need to encompass every location we'll need to test in the global bbox,
        // otherwise Bnd_BoundSortBox doesn't work near the boundaries.
        Bnd_Box brdWithHolesBndBox = brdBndBox;

        Handle( Bnd_HArray1OfBox ) holeBoxSet = new Bnd_HArray1OfBox( 0, input.size() - 1 );

        for( size_t i = 0; i < input.size(); i++ )
        {
            Bnd_Box bbox;
            BRepBndLib::Add( input[i], bbox );
            brdWithHolesBndBox.Add( bbox );
            ( *holeBoxSet )[i] = bbox;
        }

        bsbHoles.Initialize( brdWithHolesBndBox, holeBoxSet );
    };

    auto subtractShapes = []( const wxString& aWhat, std::vector<TopoDS_Shape>& aShapesList,
                              std::vector<TopoDS_Shape>& aHolesList, Bnd_BoundSortBox& aBSBHoles )
    {
        // Remove holes for each item (board body or bodies, one can have more than one board)
        int cnt = 0;
        for( TopoDS_Shape& shape : aShapesList )
        {
            Bnd_Box shapeBbox;
            BRepBndLib::Add( shape, shapeBbox );

            const TColStd_ListOfInteger& indices = aBSBHoles.Compare( shapeBbox );

            TopTools_ListOfShape holelist;

            for( const Standard_Integer& index : indices )
                holelist.Append( aHolesList[index] );

            if( cnt == 0 )
                ReportMessage( wxString::Format( _( "Build holes for %s\n" ), aWhat ) );

            cnt++;

            if( cnt % 10 == 0 )
                ReportMessage( wxString::Format( _( "Cutting %d/%d %s\n" ), cnt,
                                                 (int) aShapesList.size(), aWhat ) );

            if( holelist.IsEmpty() )
                continue;

            TopTools_ListOfShape cutArgs;
            cutArgs.Append( shape );

            BRepAlgoAPI_Cut cut;

            cut.SetRunParallel( true );
            cut.SetToFillHistory( false );

            cut.SetArguments( cutArgs );
            cut.SetTools( holelist );
            cut.Build();

            if( cut.HasErrors() || cut.HasWarnings() )
            {
                ReportMessage( wxString::Format(
                        _( "\n** Got problems while cutting %s number %d **\n" ), aWhat, cnt ) );
                shapeBbox.Dump();

                if( cut.HasErrors() )
                {
                    ReportMessage( _( "Errors:\n" ) );
                    cut.DumpErrors( std::cout );
                }

                if( cut.HasWarnings() )
                {
                    ReportMessage( _( "Warnings:\n" ) );
                    cut.DumpWarnings( std::cout );
                }

                std::cout << "\n";
            }

            shape = cut.Shape();
        }
    };

    if( m_boardCutouts.size() )
    {
        Bnd_BoundSortBox bsbHoles;
        buildBSB( m_boardCutouts, bsbHoles );

        subtractShapes( _( "shapes" ), m_board_outlines, m_boardCutouts, bsbHoles );
    }

    if( m_copperCutouts.size() )
    {
        Bnd_BoundSortBox bsbHoles;
        buildBSB( m_copperCutouts, bsbHoles );

        subtractShapes( _( "pads" ), m_board_copper_pads, m_copperCutouts, bsbHoles );
        subtractShapes( _( "tracks" ), m_board_copper_tracks, m_copperCutouts, bsbHoles );
        subtractShapes( _( "zones" ), m_board_copper_zones, m_copperCutouts, bsbHoles );
    }

    // push the board to the data structure
    ReportMessage( wxT( "\nGenerate board full shape.\n" ) );

    auto pushToAssembly = [&]( std::vector<TopoDS_Shape>& aShapesList, Quantity_Color aColor,
                               const wxString& aShapeName )
    {
        int i = 1;
        for( TopoDS_Shape& shape : aShapesList )
        {
            Handle( TDataStd_TreeNode ) node;

            // Dont expand the component or else coloring it gets hard
            TDF_Label lbl = m_assy->AddComponent( m_assy_label, shape, false );
            m_pcb_labels.push_back( lbl );

            if( m_pcb_labels.back().IsNull() )
                break;

            lbl.FindAttribute( XCAFDoc::ShapeRefGUID(), node );
            TDF_Label shpLbl = node->Father()->Label();
            if( !shpLbl.IsNull() )
            {
                colorTool->SetColor( shpLbl, aColor, XCAFDoc_ColorSurf );
                wxString shapeName;

                if( aShapesList.size() > 1 )
                {
                    shapeName = wxString::Format( wxT( "%s_%s_%d" ), m_pcbName, aShapeName, i );
                }
                else
                {
                    shapeName = wxString::Format( wxT( "%s_%s" ), m_pcbName, aShapeName );
                }


                TCollection_ExtendedString partname( shapeName.ToUTF8().data() );
                TDataStd_Name::Set( shpLbl, partname );
            }

            i++;
        }
    };

    // AddComponent adds a label that has a reference (not a parent/child relation) to the real
    // label.  We need to extract that real label to name it for the STEP output cleanly
    // Why are we trying to name the bare board? Because CAD tools like SolidWorks do fun things
    // like "deduplicate" imported STEPs by swapping STEP assembly components with already
    // identically named assemblies.  So we want to avoid having the PCB be generally defaulted
    // to "Component" or "Assembly".

    // Init colors  for the board body and the copper items (if any)
    Quantity_Color board_color( m_boardColor[0], m_boardColor[1], m_boardColor[2],
                                Quantity_TOC_RGB );
    Quantity_Color copper_color( m_copperColor[0], m_copperColor[1], m_copperColor[2],
                                 Quantity_TOC_RGB );

    if( m_fuseShapes )
    {
        ReportMessage( wxT( "Fusing shapes\n" ) );

        auto iterateCopperItems = [this]( std::function<void( TopoDS_Shape& )> aFn )
        {
            for( TopoDS_Shape& shape : m_board_copper_tracks )
                aFn( shape );

            for( TopoDS_Shape& shape : m_board_copper_zones )
                aFn( shape );

            for( TopoDS_Shape& shape : m_board_copper_pads )
                aFn( shape );
        };

        BRepAlgoAPI_Fuse     mkFuse;
        TopTools_ListOfShape shapeArguments, shapeTools;

        iterateCopperItems(
                [&]( TopoDS_Shape& sh )
                {
                    if( sh.IsNull() )
                        return;

                    if( shapeArguments.IsEmpty() )
                        shapeArguments.Append( sh );
                    else
                        shapeTools.Append( sh );
                } );

        mkFuse.SetRunParallel( true );
        mkFuse.SetToFillHistory( false );
        mkFuse.SetArguments( shapeArguments );
        mkFuse.SetTools( shapeTools );
        mkFuse.Build();

        if( mkFuse.HasErrors() || mkFuse.HasWarnings() )
        {
            ReportMessage( _( "** Got problems while fusing shapes **\n" ) );

            if( mkFuse.HasErrors() )
            {
                ReportMessage( _( "Errors:\n" ) );
                mkFuse.DumpErrors( std::cout );
            }

            if( mkFuse.HasWarnings() )
            {
                ReportMessage( _( "Warnings:\n" ) );
                mkFuse.DumpWarnings( std::cout );
            }

            std::cout << "\n";
        }

        if( mkFuse.IsDone() )
        {
            ReportMessage( wxT( "Removing extra edges/faces\n" ) );

            TopoDS_Shape fusedShape = mkFuse.Shape();

            ShapeUpgrade_UnifySameDomain unify( fusedShape, true, true, false );
            unify.History() = nullptr;
            unify.Build();

            TopoDS_Shape unifiedShapes = unify.Shape();

            if( !unifiedShapes.IsNull() )
            {
                m_board_copper_fused.emplace_back( unifiedShapes );
            }
            else
            {
                ReportMessage( _( "** ShapeUpgrade_UnifySameDomain produced a null shape **\n" ) );
                m_board_copper_fused.emplace_back( fusedShape );
            }

            m_board_copper_tracks.clear();
            m_board_copper_zones.clear();
            m_board_copper_pads.clear();
        }
    }

    pushToAssembly( m_board_copper_tracks, copper_color, "track" );
    pushToAssembly( m_board_copper_zones, copper_color, "zone" );
    pushToAssembly( m_board_copper_pads, copper_color, "pad" );
    pushToAssembly( m_board_copper_fused, copper_color, "copper" );

    if( aPushBoardBody )
        pushToAssembly( m_board_outlines, board_color, "PCB" );

#if( defined OCC_VERSION_HEX ) && ( OCC_VERSION_HEX > 0x070101 )
    m_assy->UpdateAssemblies();
#endif

    return true;
}


#ifdef SUPPORTS_IGES
// write the assembly model in IGES format
bool STEP_PCB_MODEL::WriteIGES( const wxString& aFileName )
{
    if( !isBoardOutlineValid() )
    {
        ReportMessage( wxString::Format( wxT( "No valid PCB assembly; cannot create output file "
                                              "'%s'.\n" ),
                                         aFileName ) );
        return false;
    }

    wxFileName fn( aFileName );
    IGESControl_Controller::Init();
    IGESCAFControl_Writer writer;
    writer.SetColorMode( Standard_True );
    writer.SetNameMode( Standard_True );
    IGESData_GlobalSection header = writer.Model()->GlobalSection();
    header.SetFileName( new TCollection_HAsciiString( fn.GetFullName().ToAscii() ) );
    header.SetSendName( new TCollection_HAsciiString( "KiCad electronic assembly" ) );
    header.SetAuthorName(
            new TCollection_HAsciiString( Interface_Static::CVal( "write.iges.header.author" ) ) );
    header.SetCompanyName(
            new TCollection_HAsciiString( Interface_Static::CVal( "write.iges.header.company" ) ) );
    writer.Model()->SetGlobalSection( header );

    if( Standard_False == writer.Perform( m_doc, aFileName.c_str() ) )
        return false;

    return true;
}
#endif


bool STEP_PCB_MODEL::WriteSTEP( const wxString& aFileName, bool aOptimize )
{
    if( !isBoardOutlineValid() )
    {
        ReportMessage( wxString::Format( wxT( "No valid PCB assembly; cannot create output file "
                                              "'%s'.\n" ),
                                         aFileName ) );
        return false;
    }

    wxFileName fn( aFileName );

    STEPCAFControl_Writer writer;
    writer.SetColorMode( Standard_True );
    writer.SetNameMode( Standard_True );

    // This must be set before we "transfer" the document.
    // Should default to kicad_pcb.general.title_block.title,
    // but in the meantime, defaulting to the basename of the output
    // target is still better than "open cascade step translter v..."
    // UTF8 should be ok from ISO 10303-21:2016, but... older stuff? use boring ascii
    if( !Interface_Static::SetCVal( "write.step.product.name", fn.GetName().ToAscii() ) )
        ReportMessage( wxT( "Failed to set step product name, but will attempt to continue." ) );

    // Setting write.surfacecurve.mode to 0 reduces file size and write/read times.
    // But there are reports that this mode might be less compatible in some cases.
    if( !Interface_Static::SetIVal( "write.surfacecurve.mode", aOptimize ? 0 : 1 ) )
        ReportMessage( wxT( "Failed to set surface curve mode, but will attempt to continue." ) );

    if( Standard_False == writer.Transfer( m_doc, STEPControl_AsIs ) )
        return false;

    APIHeaderSection_MakeHeader hdr( writer.ChangeWriter().Model() );

    // Note: use only Ascii7 chars, non Ascii7 chars (therefore UFT8 chars)
    // are creating issues in the step file
    hdr.SetName( new TCollection_HAsciiString( fn.GetFullName().ToAscii() ) );

    // TODO: how to control and ensure consistency with IGES?
    hdr.SetAuthorValue( 1, new TCollection_HAsciiString( "Pcbnew" ) );
    hdr.SetOrganizationValue( 1, new TCollection_HAsciiString( "Kicad" ) );
    hdr.SetOriginatingSystem( new TCollection_HAsciiString( "KiCad to STEP converter" ) );
    hdr.SetDescriptionValue( 1, new TCollection_HAsciiString( "KiCad electronic assembly" ) );

    bool success = true;

    // Creates a temporary file with a ascii7 name, because writer does not know unicode filenames.
    wxString currCWD = wxGetCwd();
    wxString workCWD = fn.GetPath();

    if( !workCWD.IsEmpty() )
        wxSetWorkingDirectory( workCWD );

    char tmpfname[] = "$tempfile$.step";

    if( Standard_False == writer.Write( tmpfname ) )
        success = false;

    if( success )
    {

        // Preserve the permissions of the current file
        KIPLATFORM::IO::DuplicatePermissions( fn.GetFullPath(), tmpfname );

        if( !wxRenameFile( tmpfname, fn.GetFullName(), true ) )
        {
            ReportMessage( wxString::Format( wxT( "Cannot rename temporary file '%s' to '%s'.\n" ),
                                             tmpfname,
                                             fn.GetFullName() ) );
            success = false;
        }
    }

    wxSetWorkingDirectory( currCWD );

    return success;
}


bool STEP_PCB_MODEL::WriteBREP( const wxString& aFileName )
{
    if( !isBoardOutlineValid() )
    {
        ReportMessage( wxString::Format( wxT( "No valid PCB assembly; cannot create output file "
                                              "'%s'.\n" ),
                                         aFileName ) );
        return false;
    }

    // s_assy = shape tool for the source
    Handle( XCAFDoc_ShapeTool ) s_assy = XCAFDoc_DocumentTool::ShapeTool( m_doc->Main() );

    // retrieve assembly as a single shape
    TopoDS_Shape shape = getOneShape( s_assy );

    wxFileName fn( aFileName );

    wxFFileOutputStream ffStream( fn.GetFullPath() );
    wxStdOutputStream   stdStream( ffStream );

#if OCC_VERSION_HEX >= 0x070600
    BRepTools::Write( shape, stdStream, false, false, TopTools_FormatVersion_VERSION_1 );
#else
    BRepTools::Write( shape, stdStream );
#endif

    return true;
}


bool STEP_PCB_MODEL::WriteXAO( const wxString& aFileName )
{
    wxFileName fn( aFileName );

    wxFFileOutputStream ffStream( fn.GetFullPath() );
    wxStdOutputStream   file( ffStream );

    if( !ffStream.IsOk() )
    {
        ReportMessage( wxString::Format( "Could not open file '%s'", fn.GetFullPath() ) );
        return false;
    }

    // s_assy = shape tool for the source
    Handle( XCAFDoc_ShapeTool ) s_assy = XCAFDoc_DocumentTool::ShapeTool( m_doc->Main() );

    // retrieve assembly as a single shape
    const TopoDS_Shape shape = getOneShape( s_assy );

    std::map<wxString, std::vector<int>> groups[4];
    TopExp_Explorer                      exp;
    int                                  faceIndex = 0;

    for( exp.Init( shape, TopAbs_FACE ); exp.More(); exp.Next() )
    {
        TopoDS_Shape subShape = exp.Current();

        Bnd_Box bbox;
        BRepBndLib::Add( subShape, bbox );

        for( const auto& [padKey, pair] : m_pad_points )
        {
            const auto& [point, padTestShape] = pair;

            if( bbox.IsOut( point ) )
                continue;

            BRepAdaptor_Surface surface( TopoDS::Face( subShape ) );

            if( surface.GetType() != GeomAbs_Plane )
                continue;

            BRepExtrema_DistShapeShape dist( padTestShape, subShape );
            dist.Perform();

            if( !dist.IsDone() )
                continue;

            if( dist.Value() < Precision::Approximation() )
            {
                // Push as a face group
                groups[2][padKey].push_back( faceIndex );
            }
        }

        faceIndex++;
    }

    // Based on Gmsh code
    file << "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" << std::endl;
    file << "<XAO version=\"1.0\" author=\"KiCad\">" << std::endl;
    file << "  <geometry name=\"" << fn.GetName() << "\">" << std::endl;
    file << "    <shape format=\"BREP\"><![CDATA[";
#if OCC_VERSION_HEX < 0x070600
    BRepTools::Write( shape, file );
#else
    BRepTools::Write( shape, file, Standard_True, Standard_True, TopTools_FormatVersion_VERSION_1 );
#endif
    file << "]]></shape>" << std::endl;
    file << "    <topology>" << std::endl;

    TopTools_IndexedMapOfShape mainMap;
    TopExp::MapShapes( shape, mainMap );
    std::set<int> topo[4];

    static const TopAbs_ShapeEnum c_dimShapeTypes[] = { TopAbs_VERTEX, TopAbs_EDGE, TopAbs_FACE,
                                                        TopAbs_SOLID };

    static const std::string c_dimLabel[] = { "vertex", "edge", "face", "solid" };
    static const std::string c_dimLabels[] = { "vertices", "edges", "faces", "solids" };

    for( int dim = 0; dim < 4; dim++ )
    {
        for( exp.Init( shape, c_dimShapeTypes[dim] ); exp.More(); exp.Next() )
        {
            TopoDS_Shape subShape = exp.Current();
            int          idx = mainMap.FindIndex( subShape );

            if( idx && !topo[dim].count( idx ) )
                topo[dim].insert( idx );
        }
    }

    for( int dim = 0; dim <= 3; dim++ )
    {
        std::string labels = c_dimLabels[dim];
        std::string label = c_dimLabel[dim];

        file << "      <" << labels << " count=\"" << topo[dim].size() << "\">" << std::endl;
        int index = 0;

        for( auto p : topo[dim] )
        {
            std::string name( "" );
            file << "        <" << label << " index=\"" << index << "\" "
                 << "name=\"" << name << "\" "
                 << "reference=\"" << p << "\"/>" << std::endl;

            index++;
        }
        file << "      </" << labels << ">" << std::endl;
    }

    file << "    </topology>" << std::endl;
    file << "  </geometry>" << std::endl;
    file << "  <groups count=\""
         << groups[0].size() + groups[1].size() + groups[2].size() + groups[3].size() << "\">"
         << std::endl;
    for( int dim = 0; dim <= 3; dim++ )
    {
        std::string label = c_dimLabel[dim];

        for( auto g : groups[dim] )
        {
            //std::string name = model->getPhysicalName( dim, g.first );
            wxString name = g.first;

            if( name.empty() )
            { // create same unique name as for MED export
                std::ostringstream gs;
                gs << "G_" << dim << "D_" << g.first;
                name = gs.str();
            }
            file << "    <group name=\"" << name << "\" dimension=\"" << label;
//#if 1
//            // Gmsh XAO extension: also save the physical tag, so that XAO can be used
//            // to serialize OCC geometries, ready to be used by GetDP, GmshFEM & co
//            file << "\" tag=\"" << g.first;
//#endif
            file << "\" count=\"" << g.second.size() << "\">" << std::endl;
            for( auto index : g.second )
            {
                file << "      <element index=\"" << index << "\"/>" << std::endl;
            }
            file << "    </group>" << std::endl;
        }
    }
    file << "  </groups>" << std::endl;
    file << "  <fields count=\"0\"/>" << std::endl;
    file << "</XAO>" << std::endl;

    return true;
}


bool STEP_PCB_MODEL::getModelLabel( const std::string& aFileNameUTF8, VECTOR3D aScale, TDF_Label& aLabel,
                              bool aSubstituteModels, wxString* aErrorMessage )
{
    std::string model_key = aFileNameUTF8 + "_" + std::to_string( aScale.x )
                            + "_" + std::to_string( aScale.y ) + "_" + std::to_string( aScale.z );

    MODEL_MAP::const_iterator mm = m_models.find( model_key );

    if( mm != m_models.end() )
    {
        aLabel = mm->second;
        return true;
    }

    aLabel.Nullify();

    Handle( TDocStd_Document )  doc;
    m_app->NewDocument( "MDTV-XCAF", doc );

    wxString fileName( wxString::FromUTF8( aFileNameUTF8.c_str() ) );
    MODEL3D_FORMAT_TYPE modelFmt = fileType( aFileNameUTF8.c_str() );

    switch( modelFmt )
    {
    case FMT_IGES:
        if( !readIGES( doc, aFileNameUTF8.c_str() ) )
        {
            ReportMessage( wxString::Format( wxT( "readIGES() failed on filename '%s'.\n" ),
                                             fileName ) );
            return false;
        }
        break;

    case FMT_STEP:
        if( !readSTEP( doc, aFileNameUTF8.c_str() ) )
        {
            ReportMessage( wxString::Format( wxT( "readSTEP() failed on filename '%s'.\n" ),
                                             fileName ) );
            return false;
        }
        break;

    case FMT_STEPZ:
    {
        // To export a compressed step file (.stpz or .stp.gz file), the best way is to
        // decaompress it in a temporaty file and load this temporary file
        wxFFileInputStream ifile( fileName );
        wxFileName         outFile( fileName );

        outFile.SetPath( wxStandardPaths::Get().GetTempDir() );
        outFile.SetExt( wxT( "step" ) );
        wxFileOffset size = ifile.GetLength();

        if( size == wxInvalidOffset )
        {
            ReportMessage( wxString::Format( wxT( "getModelLabel() failed on filename '%s'.\n" ),
                                             fileName ) );
            return false;
        }

        {
            bool                success = false;
            wxFFileOutputStream ofile( outFile.GetFullPath() );

            if( !ofile.IsOk() )
                return false;

            char* buffer = new char[size];

            ifile.Read( buffer, size );
            std::string expanded;

            try
            {
                expanded = gzip::decompress( buffer, size );
                success = true;
            }
            catch( ... )
            {
                ReportMessage( wxString::Format( wxT( "failed to decompress '%s'.\n" ),
                                                 fileName ) );
            }

            if( expanded.empty() )
            {
                ifile.Reset();
                ifile.SeekI( 0 );
                wxZipInputStream            izipfile( ifile );
                std::unique_ptr<wxZipEntry> zip_file( izipfile.GetNextEntry() );

                if( zip_file && !zip_file->IsDir() && izipfile.CanRead() )
                {
                    izipfile.Read( ofile );
                    success = true;
                }
            }
            else
            {
                ofile.Write( expanded.data(), expanded.size() );
            }

            delete[] buffer;
            ofile.Close();

            if( success )
            {
                std::string altFileNameUTF8 = TO_UTF8( outFile.GetFullPath() );
                success =
                        getModelLabel( altFileNameUTF8, VECTOR3D( 1.0, 1.0, 1.0 ), aLabel, false );
            }

            return success;
        }

        break;
    }

    case FMT_WRL:
    case FMT_WRZ:
        /* WRL files are preferred for internal rendering, due to superior material properties, etc.
         * However they are not suitable for MCAD export.
         *
         * If a .wrl file is specified, attempt to locate a replacement file for it.
         *
         * If a valid replacement file is found, the label for THAT file will be associated with
         * the .wrl file
         */
        if( aSubstituteModels )
        {
            wxFileName wrlName( fileName );

            wxString basePath = wrlName.GetPath();
            wxString baseName = wrlName.GetName();

            // List of alternate files to look for
            // Given in order of preference
            // (Break if match is found)
            wxArrayString alts;

            // Step files
            alts.Add( wxT( "stp" ) );
            alts.Add( wxT( "step" ) );
            alts.Add( wxT( "STP" ) );
            alts.Add( wxT( "STEP" ) );
            alts.Add( wxT( "Stp" ) );
            alts.Add( wxT( "Step" ) );
            alts.Add( wxT( "stpz" ) );
            alts.Add( wxT( "stpZ" ) );
            alts.Add( wxT( "STPZ" ) );
            alts.Add( wxT( "step.gz" ) );
            alts.Add( wxT( "stp.gz" ) );

            // IGES files
            alts.Add( wxT( "iges" ) );
            alts.Add( wxT( "IGES" ) );
            alts.Add( wxT( "igs" ) );
            alts.Add( wxT( "IGS" ) );

            //TODO - Other alternative formats?

            for( const auto& alt : alts )
            {
                wxFileName altFile( basePath, baseName + wxT( "." ) + alt );

                if( altFile.IsOk() && altFile.FileExists() )
                {
                    std::string altFileNameUTF8 = TO_UTF8( altFile.GetFullPath() );

                    // When substituting a STEP/IGS file for VRML, do not apply the VRML scaling
                    // to the new STEP model.  This process of auto-substitution is janky as all
                    // heck so let's not mix up un-displayed scale factors with potentially
                    // mis-matched files.  And hope that the user doesn't have multiples files
                    // named "model.wrl" and "model.stp" referring to different parts.
                    // TODO: Fix model handling in v7.  Default models should only be STP.
                    //       Have option to override this in DISPLAY.
                    if( getModelLabel( altFileNameUTF8, VECTOR3D( 1.0, 1.0, 1.0 ), aLabel, false ) )
                    {
                        return true;
                    }
                }
            }

            // VRML models only work when exporting to glTF
            // Also OCCT < 7.9.0 fail to load most VRML 2.0 models because of Switch nodes
            if( readVRML( doc, aFileNameUTF8.c_str() ) )
            {
                Handle( XCAFDoc_ShapeTool ) shapeTool =
                        XCAFDoc_DocumentTool::ShapeTool( doc->Main() );

                prefixNames( shapeTool->Label(),
                             TCollection_ExtendedString( baseName.c_str().AsChar() ) );
            }
            else
            {
                ReportMessage( wxString::Format( wxT( "readVRML() failed on filename '%s'.\n" ),
                                                 fileName ) );
                return false;
            }
        }
        else // Substitution is not allowed
        {
            if( aErrorMessage )
                aErrorMessage->Printf( wxT( "Cannot load any VRML model for this export.\n" ) );

            return false;
        }

        break;

        // TODO: implement IDF and EMN converters

    default:
        return false;
    }

    aLabel = transferModel( doc, m_doc, aScale );

    if( aLabel.IsNull() )
    {
        ReportMessage( wxString::Format( wxT( "Could not transfer model data from file '%s'.\n" ),
                                         fileName  ) );
        return false;
    }

    // attach the PART NAME ( base filename: note that in principle
    // different models may have the same base filename )
    wxFileName afile( fileName );
    std::string pname( afile.GetName().ToUTF8() );
    TCollection_ExtendedString partname( pname.c_str() );
    TDataStd_Name::Set( aLabel, partname );

    m_models.insert( MODEL_DATUM( model_key, aLabel ) );
    ++m_components;
    return true;
}


bool STEP_PCB_MODEL::getModelLocation( bool aBottom, VECTOR2D aPosition, double aRotation, VECTOR3D aOffset, VECTOR3D aOrientation,
                                 TopLoc_Location& aLocation )
{
    // Order of operations:
    // a. aOrientation is applied -Z*-Y*-X
    // b. aOffset is applied
    //      Top ? add thickness to the Z offset
    // c. Bottom ? Rotate on X axis (in contrast to most ECAD which mirror on Y),
    //             then rotate on +Z
    //    Top ? rotate on -Z
    // d. aPosition is applied
    //
    // Note: Y axis is inverted in KiCad

    gp_Trsf lPos;
    lPos.SetTranslation( gp_Vec( aPosition.x, -aPosition.y, 0.0 ) );

    // Offset board thickness
    aOffset.z += BOARD_OFFSET;

    double boardThickness;
    double boardZPos;
    getBoardBodyZPlacement( boardZPos, boardThickness );
    double top = std::max( boardZPos, boardZPos + boardThickness );
    double bottom = std::min( boardZPos, boardZPos + boardThickness );

    gp_Trsf lRot;

    if( aBottom )
    {
        aOffset.z -= bottom;
        lRot.SetRotation( gp_Ax1( gp_Pnt( 0.0, 0.0, 0.0 ), gp_Dir( 0.0, 0.0, 1.0 ) ), aRotation );
        lPos.Multiply( lRot );
        lRot.SetRotation( gp_Ax1( gp_Pnt( 0.0, 0.0, 0.0 ), gp_Dir( 1.0, 0.0, 0.0 ) ), M_PI );
        lPos.Multiply( lRot );
    }
    else
    {
        aOffset.z += top;
        lRot.SetRotation( gp_Ax1( gp_Pnt( 0.0, 0.0, 0.0 ), gp_Dir( 0.0, 0.0, 1.0 ) ), aRotation );
        lPos.Multiply( lRot );
    }

    gp_Trsf lOff;
    lOff.SetTranslation( gp_Vec( aOffset.x, aOffset.y, aOffset.z ) );
    lPos.Multiply( lOff );

    gp_Trsf lOrient;
    lOrient.SetRotation( gp_Ax1( gp_Pnt( 0.0, 0.0, 0.0 ), gp_Dir( 0.0, 0.0, 1.0 ) ),
                         -aOrientation.z );
    lPos.Multiply( lOrient );
    lOrient.SetRotation( gp_Ax1( gp_Pnt( 0.0, 0.0, 0.0 ), gp_Dir( 0.0, 1.0, 0.0 ) ),
                         -aOrientation.y );
    lPos.Multiply( lOrient );
    lOrient.SetRotation( gp_Ax1( gp_Pnt( 0.0, 0.0, 0.0 ), gp_Dir( 1.0, 0.0, 0.0 ) ),
                         -aOrientation.x );
    lPos.Multiply( lOrient );

    aLocation = TopLoc_Location( lPos );
    return true;
}


bool STEP_PCB_MODEL::readIGES( Handle( TDocStd_Document )& doc, const char* fname )
{
    IGESControl_Controller::Init();
    IGESCAFControl_Reader reader;
    IFSelect_ReturnStatus stat  = reader.ReadFile( fname );

    if( stat != IFSelect_RetDone )
        return false;

    // Enable user-defined shape precision
    if( !Interface_Static::SetIVal( "read.precision.mode", 1 ) )
        return false;

    // Set the shape conversion precision to USER_PREC (default 0.0001 has too many triangles)
    if( !Interface_Static::SetRVal( "read.precision.val", USER_PREC ) )
        return false;

    // set other translation options
    reader.SetColorMode( true );  // use model colors
    reader.SetNameMode( false );  // don't use IGES label names
    reader.SetLayerMode( false ); // ignore LAYER data

    if( !reader.Transfer( doc ) )
    {
        if( doc->CanClose() == CDM_CCS_OK )
            doc->Close();

        return false;
    }

    // are there any shapes to translate?
    if( reader.NbShapes() < 1 )
    {
        if( doc->CanClose() == CDM_CCS_OK )
            doc->Close();

        return false;
    }

    return true;
}


bool STEP_PCB_MODEL::readSTEP( Handle( TDocStd_Document )& doc, const char* fname )
{
    STEPCAFControl_Reader reader;
    IFSelect_ReturnStatus stat  = reader.ReadFile( fname );

    if( stat != IFSelect_RetDone )
        return false;

    // Enable user-defined shape precision
    if( !Interface_Static::SetIVal( "read.precision.mode", 1 ) )
        return false;

    // Set the shape conversion precision to USER_PREC (default 0.0001 has too many triangles)
    if( !Interface_Static::SetRVal( "read.precision.val", USER_PREC ) )
        return false;

    // set other translation options
    reader.SetColorMode( true );  // use model colors
    reader.SetNameMode( true );  // use label names
    reader.SetLayerMode( false ); // ignore LAYER data

    if( !reader.Transfer( doc ) )
    {
        if( doc->CanClose() == CDM_CCS_OK )
            doc->Close();

        return false;
    }

    // are there any shapes to translate?
    if( reader.NbRootsForTransfer() < 1 )
    {
        if( doc->CanClose() == CDM_CCS_OK )
            doc->Close();

        return false;
    }

    return true;
}


bool STEP_PCB_MODEL::readVRML( Handle( TDocStd_Document ) & doc, const char* fname )
{
#if OCC_VERSION_HEX >= 0x070700
    VrmlAPI_CafReader                reader;
    RWMesh_CoordinateSystemConverter conv;
    conv.SetInputLengthUnit( 2.54 );
    reader.SetCoordinateSystemConverter( conv );
    reader.SetDocument( doc );

    if( !reader.Perform( TCollection_AsciiString( fname ), Message_ProgressRange() ) )
        return false;

    return true;
#else
    return false;
#endif
}


TDF_Label STEP_PCB_MODEL::transferModel( Handle( TDocStd_Document ) & source,
                                         Handle( TDocStd_Document ) & dest, VECTOR3D aScale )
{
    // transfer data from Source into a top level component of Dest
    // s_assy = shape tool for the source
    Handle( XCAFDoc_ShapeTool ) s_assy = XCAFDoc_DocumentTool::ShapeTool( source->Main() );

    // retrieve all free shapes within the assembly
    TDF_LabelSequence frshapes;
    s_assy->GetFreeShapes( frshapes );

    // d_assy = shape tool for the destination
    Handle( XCAFDoc_ShapeTool ) d_assy = XCAFDoc_DocumentTool::ShapeTool( dest->Main() );

    // create a new shape within the destination and set the assembly tool to point to it
    TDF_Label d_targetLabel = d_assy->NewShape();

    if( frshapes.Size() == 1 )
    {
        TDocStd_XLinkTool link;
        link.Copy( d_targetLabel, frshapes.First() );
    }
    else
    {
        // Rare case
        for( TDF_Label& s_shapeLabel : frshapes )
        {
            TDF_Label d_component = d_assy->NewShape();

            TDocStd_XLinkTool link;
            link.Copy( d_component, s_shapeLabel );

            d_assy->AddComponent( d_targetLabel, d_component, TopLoc_Location() );
        }
    }

    if( aScale.x != 1.0 || aScale.y != 1.0 || aScale.z != 1.0 )
        rescaleShapes( d_targetLabel, gp_XYZ( aScale.x, aScale.y, aScale.z ) );

    return d_targetLabel;
}


bool STEP_PCB_MODEL::WriteGLTF( const wxString& aFileName )
{
    if( !isBoardOutlineValid() )
    {
        ReportMessage( wxString::Format( wxT( "No valid PCB assembly; cannot create output file "
                                              "'%s'.\n" ),
                                         aFileName ) );
        return false;
    }

    TDF_LabelSequence freeShapes;
    m_assy->GetFreeShapes( freeShapes );

    ReportMessage( wxT( "Meshing model\n" ) );

    // GLTF is a mesh format, we have to trigger opencascade to mesh the shapes we composited into the asesmbly
    // To mesh models, lets just grab the free shape root and execute on them
    for( Standard_Integer i = 1; i <= freeShapes.Length(); ++i )
    {
        TDF_Label    label = freeShapes.Value( i );
        TopoDS_Shape shape;
        m_assy->GetShape( label, shape );

        // These deflection values basically affect the accuracy of the mesh generated, a tighter
        // deflection will result in larger meshes
        // We could make this a tunable parameter, but for now fix it
        const Standard_Real      linearDeflection = 0.01;
        const Standard_Real      angularDeflection = 0.5;
        BRepMesh_IncrementalMesh mesh( shape, linearDeflection, Standard_False, angularDeflection,
                                       Standard_True );
    }

    wxFileName fn( aFileName );

    const char* tmpGltfname = "$tempfile$.glb";
    RWGltf_CafWriter cafWriter( tmpGltfname, true );

    cafWriter.SetTransformationFormat( RWGltf_WriterTrsfFormat_Compact );
    cafWriter.ChangeCoordinateSystemConverter().SetInputLengthUnit( 0.001 );
    cafWriter.ChangeCoordinateSystemConverter().SetInputCoordinateSystem(
            RWMesh_CoordinateSystem_Zup );
#if OCC_VERSION_HEX >= 0x070700
    cafWriter.SetParallel( true );
#endif
    TColStd_IndexedDataMapOfStringString metadata;

    metadata.Add( TCollection_AsciiString( "pcb_name" ),
                  TCollection_ExtendedString( fn.GetName().wc_str() ) );
    metadata.Add( TCollection_AsciiString( "source_pcb_file" ),
                  TCollection_ExtendedString( fn.GetFullName().wc_str() ) );
    metadata.Add( TCollection_AsciiString( "generator" ),
                  TCollection_AsciiString( wxString::Format( wxS( "KiCad %s" ), GetSemanticVersion() ).ToAscii() ) );
    metadata.Add( TCollection_AsciiString( "generated_at" ),
                  TCollection_AsciiString( GetISO8601CurrentDateTime().ToAscii() ) );

    bool success = true;

    // Creates a temporary file with a ascii7 name, because writer does not know unicode filenames.
    wxString currCWD = wxGetCwd();
    wxString workCWD = fn.GetPath();

    if( !workCWD.IsEmpty() )
        wxSetWorkingDirectory( workCWD );

    success = cafWriter.Perform( m_doc, metadata, Message_ProgressRange() );

    if( success )
    {
        // Preserve the permissions of the current file
        KIPLATFORM::IO::DuplicatePermissions( fn.GetFullPath(), tmpGltfname );

        if( !wxRenameFile( tmpGltfname, fn.GetFullName(), true ) )
        {
            ReportMessage( wxString::Format( wxT( "Cannot rename temporary file '%s' to '%s'.\n" ),
                                             tmpGltfname, fn.GetFullName() ) );
            success = false;
        }
    }

    wxSetWorkingDirectory( currCWD );

    return success;
}