TetraMesh.h

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// ----------------------------------------------------------------------------
// -                        Open3D: www.open3d.org                            -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2023 www.open3d.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------
 
#pragma once
 
#include <Eigen/Core>
#include <Eigen/StdVector>
#include <memory>
#include <vector>
 
#include "open3d/geometry/MeshBase.h"
#include "open3d/utility/Eigen.h"
#include "open3d/utility/Helper.h"
 
namespace open3d {
namespace geometry {
 
class PointCloud;
class TriangleMesh;
 
class TetraMesh : public MeshBase {
public:
    TetraMesh() : MeshBase(Geometry::GeometryType::TetraMesh) {}
    TetraMesh(const std::vector<Eigen::Vector3d> &vertices,
              const std::vector<Eigen::Vector4i, utility::Vector4i_allocator>
                      &tetras)
        : MeshBase(Geometry::GeometryType::TetraMesh, vertices),
          tetras_(tetras) {}
    ~TetraMesh() override {}
 
public:
    TetraMesh &Clear() override;
 
public:
    TetraMesh &operator+=(const TetraMesh &mesh);
    TetraMesh operator+(const TetraMesh &mesh) const;
 
    TetraMesh &RemoveDuplicatedVertices();
 
    TetraMesh &RemoveDuplicatedTetras();
 
    TetraMesh &RemoveUnreferencedVertices();
 
    TetraMesh &RemoveDegenerateTetras();
 
    bool HasTetras() const {
        return vertices_.size() > 0 && tetras_.size() > 0;
    }
 
    std::shared_ptr<TriangleMesh> ExtractTriangleMesh(
            const std::vector<double> &values, double level);
 
    static std::tuple<std::shared_ptr<TetraMesh>, std::vector<size_t>>
    CreateFromPointCloud(const PointCloud &point_cloud);
 
protected:
    // Forward child class type to avoid indirect nonvirtual base
    TetraMesh(Geometry::GeometryType type) : MeshBase(type) {}
 
public:
    std::vector<Eigen::Vector4i, utility::Vector4i_allocator> tetras_;
};
 
}  // namespace geometry
}  // namespace open3d