MeshBase.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 <memory>
#include <tuple>
#include <unordered_map>
#include <unordered_set>
#include <vector>
 
#include "open3d/geometry/Geometry3D.h"
#include "open3d/utility/Helper.h"
 
namespace open3d {
namespace geometry {
 
class PointCloud;
class TriangleMesh;
 
class MeshBase : public Geometry3D {
public:
    enum class SimplificationContraction { Average, Quadric };
 
    enum class FilterScope { All, Color, Normal, Vertex };
 
    enum class DeformAsRigidAsPossibleEnergy { Spokes, Smoothed };
 
    MeshBase() : Geometry3D(Geometry::GeometryType::MeshBase) {}
    ~MeshBase() override {}
 
public:
    virtual MeshBase &Clear() override;
    virtual bool IsEmpty() const override;
    virtual Eigen::Vector3d GetMinBound() const override;
    virtual Eigen::Vector3d GetMaxBound() const override;
    virtual Eigen::Vector3d GetCenter() const override;
 
    virtual AxisAlignedBoundingBox GetAxisAlignedBoundingBox() const override;
 
    virtual OrientedBoundingBox GetOrientedBoundingBox(
            bool robust = false) const override;
 
    virtual OrientedBoundingBox GetMinimalOrientedBoundingBox(
            bool robust = false) const override;
 
    virtual MeshBase &Transform(const Eigen::Matrix4d &transformation) override;
    virtual MeshBase &Translate(const Eigen::Vector3d &translation,
                                bool relative = true) override;
    virtual MeshBase &Scale(const double scale,
                            const Eigen::Vector3d &center) override;
    virtual MeshBase &Rotate(const Eigen::Matrix3d &R,
                             const Eigen::Vector3d &center) override;
 
    MeshBase &operator+=(const MeshBase &mesh);
    MeshBase operator+(const MeshBase &mesh) const;
 
    bool HasVertices() const { return vertices_.size() > 0; }
 
    bool HasVertexNormals() const {
        return vertices_.size() > 0 &&
               vertex_normals_.size() == vertices_.size();
    }
 
    bool HasVertexColors() const {
        return vertices_.size() > 0 &&
               vertex_colors_.size() == vertices_.size();
    }
 
    MeshBase &NormalizeNormals() {
        for (size_t i = 0; i < vertex_normals_.size(); i++) {
            vertex_normals_[i].normalize();
            if (std::isnan(vertex_normals_[i](0))) {
                vertex_normals_[i] = Eigen::Vector3d(0.0, 0.0, 1.0);
            }
        }
        return *this;
    }
 
    MeshBase &PaintUniformColor(const Eigen::Vector3d &color) {
        ResizeAndPaintUniformColor(vertex_colors_, vertices_.size(), color);
        return *this;
    }
 
    std::tuple<std::shared_ptr<TriangleMesh>, std::vector<size_t>>
    ComputeConvexHull() const;
 
protected:
    // Forward child class type to avoid indirect nonvirtual base
    MeshBase(Geometry::GeometryType type) : Geometry3D(type) {}
    MeshBase(Geometry::GeometryType type,
             const std::vector<Eigen::Vector3d> &vertices)
        : Geometry3D(type), vertices_(vertices) {}
 
public:
    std::vector<Eigen::Vector3d> vertices_;
    std::vector<Eigen::Vector3d> vertex_normals_;
    std::vector<Eigen::Vector3d> vertex_colors_;
};
 
}  // namespace geometry
}  // namespace open3d