tetgen_mesher.h

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/*
 * Copyright (c) 2012-2017, Association Scientifique pour la Geologie et ses
 * Applications (ASGA). All rights reserved.
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 *       documentation and/or other materials provided with the distribution.
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 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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#pragma once

#include <ringmesh/basic/common.h>

#ifdef RINGMESH_WITH_TETGEN

#include <memory>

#include <geogram/third_party/tetgen/tetgen.h>

namespace GEO
{
    class Mesh;
} // namespace GEO

namespace RINGMesh
{
    FORWARD_DECLARATION_DIMENSION_CLASS( VolumeMeshBuilder );
} // namespace RINGMesh

namespace RINGMesh
{
    class TetgenMesher
    {
        ringmesh_disable_copy_and_move( TetgenMesher );

    public:
        TetgenMesher() = default;
        ~TetgenMesher();

        void tetrahedralize( const GEO::Mesh& input_mesh,
            VolumeMeshBuilder< 3 >& output_mesh_builder );

        void add_points_to_match_quality( double quality );

    private:
        void initialize();
        void initialize_tetgen_args();
        void tetrahedralize();

        void copy_mesh_to_tetgen_input( const GEO::Mesh& M );
        void copy_vertices_to_tetgen_input( const GEO::Mesh& M );
        void copy_edges_to_tetgen_input( const GEO::Mesh& M );
        void copy_polygons_to_tetgen_input( const GEO::Mesh& M );

        void set_regions( const std::vector< vec3 >& one_point_per_region );

        void assign_result_tetmesh_to_mesh(
            VolumeMeshBuilder< 3 >& output_mesh_builder ) const;
        std::vector< double > get_result_tetmesh_points() const;
        std::vector< index_t > get_result_tetmesh_tets() const;
        std::set< double > determine_tet_regions_to_keep() const;
        std::vector< index_t > determine_tets_to_keep() const;

    private:
        GEO_3rdParty::tetgenio tetgen_in_;
        GEO_3rdParty::tetgenio tetgen_out_;
        std::string tetgen_command_line_ = std::string( "QpnYAA" );
        GEO_3rdParty::tetgenbehavior tetgen_args_;

        std::unique_ptr< GEO_3rdParty::tetgenio::polygon[] > polygons_{};
        std::unique_ptr< int[] > polygon_corners_{};
    };

    void RINGMESH_API tetrahedralize_mesh_tetgen(
        VolumeMeshBuilder< 3 >& out_mesh_builder,
        const GEO::Mesh& in_mesh,
        bool refine,
        double quality );

} // namespace RINGMesh
#endif