Function preparePart

source/MRMesh/MRBooleanOperation.cpp:114–145

deletes unnecessary part from the mesh

/// deletes unnecessary part from the mesh
VacantElements preparePart( Mesh& mesh, const FaceBitSet& leftPart,
    bool needFlip, BooleanResultMapper::Maps* maps )
{
    MR_TIMER;

    auto rightPart = mesh.topology.getValidFaces() - leftPart;
    auto res = mesh.deleteFaces( rightPart );
    if ( needFlip )
        mesh.topology.flipOrientation();

    if ( maps )
    {
        auto& fmap = maps->cut2newFaces;
        if ( fmap.size() < mesh.topology.faceSize() )
            fmap.resize( mesh.topology.faceSize() );
        for ( auto f : mesh.topology.getValidFaces() )
            fmap[f] = f;

        auto& vmap = maps->old2newVerts;
        if ( vmap.size() < mesh.topology.vertSize() )
            vmap.resize( mesh.topology.vertSize() );
        for ( auto v : mesh.topology.getValidVerts() )
            vmap[v] = v;

        auto& emap = maps->old2newEdges;
        if ( emap.size() < mesh.topology.undirectedEdgeSize() )
            emap.resize( mesh.topology.undirectedEdgeSize() );
        for ( auto ue : undirectedEdges( mesh.topology ) )
            emap[ue] = ue;
    }
    return res;
}

// transforms partB if needed and adds it to partA
// stitches parts by paths if they are not empty