PointCloud.h

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// The MIT License (MIT)
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#pragma once

#include <Eigen/Core>
#include <memory>
#include <tuple>
#include <vector>

#include "Open3D/Geometry/Geometry3D.h"
#include "Open3D/Geometry/KDTreeSearchParam.h"

namespace open3d {

namespace camera {
class PinholeCameraIntrinsic;
}

namespace geometry {

class Image;
class RGBDImage;
class TriangleMesh;
class VoxelGrid;

class PointCloud : public Geometry3D {
public:
    PointCloud() : Geometry3D(Geometry::GeometryType::PointCloud) {}
    ~PointCloud() override {}

public:
    PointCloud &Clear() override;
    bool IsEmpty() const override;
    Eigen::Vector3d GetMinBound() const override;
    Eigen::Vector3d GetMaxBound() const override;
    Eigen::Vector3d GetCenter() const override;
    AxisAlignedBoundingBox GetAxisAlignedBoundingBox() const override;
    OrientedBoundingBox GetOrientedBoundingBox() const override;
    PointCloud &Transform(const Eigen::Matrix4d &transformation) override;
    PointCloud &Translate(const Eigen::Vector3d &translation,
                          bool relative = true) override;
    PointCloud &Scale(const double scale, bool center = true) override;
    PointCloud &Rotate(const Eigen::Vector3d &rotation,
                       bool center = true,
                       RotationType type = RotationType::XYZ) override;

    PointCloud &operator+=(const PointCloud &cloud);
    PointCloud operator+(const PointCloud &cloud) const;

    bool HasPoints() const { return points_.size() > 0; }

    bool HasNormals() const {
        return points_.size() > 0 && normals_.size() == points_.size();
    }

    bool HasColors() const {
        return points_.size() > 0 && colors_.size() == points_.size();
    }

    PointCloud &NormalizeNormals() {
        for (size_t i = 0; i < normals_.size(); i++) {
            normals_[i].normalize();
        }
        return *this;
    }

    PointCloud &PaintUniformColor(const Eigen::Vector3d &color) {
        ResizeAndPaintUniformColor(colors_, points_.size(), color);
        return *this;
    }

    PointCloud &RemoveNoneFinitePoints(bool remove_nan = true,
                                       bool remove_infinite = true);

    std::shared_ptr<PointCloud> SelectDownSample(
            const std::vector<size_t> &indices, bool invert = false) const;

    std::shared_ptr<PointCloud> VoxelDownSample(double voxel_size) const;

    std::tuple<std::shared_ptr<PointCloud>, Eigen::MatrixXi>
    VoxelDownSampleAndTrace(double voxel_size,
                            const Eigen::Vector3d &min_bound,
                            const Eigen::Vector3d &max_bound,
                            bool approximate_class = false) const;

    std::shared_ptr<PointCloud> UniformDownSample(size_t every_k_points) const;

    std::shared_ptr<PointCloud> Crop(const Eigen::Vector3d &min_bound,
                                     const Eigen::Vector3d &max_bound) const;

    std::tuple<std::shared_ptr<PointCloud>, std::vector<size_t>>
    RemoveRadiusOutliers(size_t nb_points, double search_radius) const;

    std::tuple<std::shared_ptr<PointCloud>, std::vector<size_t>>
    RemoveStatisticalOutliers(size_t nb_neighbors, double std_ratio) const;

    bool EstimateNormals(
            const KDTreeSearchParam &search_param = KDTreeSearchParamKNN(),
            bool fast_normal_computation = true);

    bool OrientNormalsToAlignWithDirection(
            const Eigen::Vector3d &orientation_reference =
                    Eigen::Vector3d(0.0, 0.0, 1.0));

    bool OrientNormalsTowardsCameraLocation(
            const Eigen::Vector3d &camera_location = Eigen::Vector3d::Zero());

    std::vector<double> ComputePointCloudDistance(const PointCloud &target);

    std::tuple<Eigen::Vector3d, Eigen::Matrix3d> ComputeMeanAndCovariance()
            const;

    std::vector<double> ComputeMahalanobisDistance() const;

    std::vector<double> ComputeNearestNeighborDistance() const;

    std::shared_ptr<TriangleMesh> ComputeConvexHull() const;

    std::vector<int> ClusterDBSCAN(double eps,
                                   size_t min_points,
                                   bool print_progress = false) const;

    static std::shared_ptr<PointCloud> CreateFromDepthImage(
            const Image &depth,
            const camera::PinholeCameraIntrinsic &intrinsic,
            const Eigen::Matrix4d &extrinsic = Eigen::Matrix4d::Identity(),
            double depth_scale = 1000.0,
            double depth_trunc = 1000.0,
            int stride = 1);

    static std::shared_ptr<PointCloud> CreateFromRGBDImage(
            const RGBDImage &image,
            const camera::PinholeCameraIntrinsic &intrinsic,
            const Eigen::Matrix4d &extrinsic = Eigen::Matrix4d::Identity());

    std::shared_ptr<PointCloud> CreateFromVoxelGrid(
            const VoxelGrid &voxel_grid);

public:
    std::vector<Eigen::Vector3d> points_;
    std::vector<Eigen::Vector3d> normals_;
    std::vector<Eigen::Vector3d> colors_;
};

}  // namespace geometry
}  // namespace open3d