Method loadModelStructure

source/MRIOExtras/MRStep.cpp:221–281

    }

    [[nodiscard]] Expected<void> loadModelStructure( STEPControl_Reader& reader, [[maybe_unused]] const ProgressCallback& callback )
    {
        MR_TIMER;

        {
            MR_NAMED_TIMER( "transfer roots" );

#if MODERN_PROGRESS_INDICATION_SUPPORTED
            ProgressIndicator progress( subprogress( callback, 0.00f, 0.80f ) );
            reader.TransferRoots( progress.Start() );
#else
            reader.TransferRoots();
#endif
        }

        if ( !reportProgress( callback, 0.80f ) )
            return unexpectedOperationCanceled();

        std::deque<TopoDS_Shape> shapes;
        for ( auto shi = 1; shi <= reader.NbShapes(); ++shi )
        {
            const auto shape = reader.Shape( shi );

            // search for closed shapes
            size_t solidCount = 0;
            for ( auto explorer = TopExp_Explorer( shape, TopAbs_SOLID ); explorer.More(); explorer.Next() )
            {
                shapes.emplace_back( explorer.Current() );
                ++solidCount;
            }
            // search for non-closed shapes
            size_t shellCount = 0;
            for ( auto explorer = TopExp_Explorer( shape, TopAbs_SHELL, TopAbs_SOLID ); explorer.More(); explorer.Next() )
            {
                shapes.emplace_back( explorer.Current() );
                ++shellCount;
            }

            // import the whole shape if it doesn't consist of solids or shells
            if ( solidCount + shellCount == 0 )
                shapes.emplace_back( shape );
        }

        rootObj_ = std::make_shared<Object>();
        rootObj_->select( true );

        for ( const auto& shape : shapes )
        {
            const auto& location = shape.Location();
            const auto xf = AffineXf3f( toXf( location.Transformation() ) );

            auto objMesh = std::make_shared<ObjectMesh>();
            objMesh->setMesh( std::make_shared<Mesh>() );
            objMesh->setXf( xf );
            objMesh->select( true );
            rootObj_->addChild( objMesh );

            meshTriangulationContexts_.emplace_back( shape, objMesh, std::nullopt, std::nullopt );