0.引言

  CloudCompaer是一款优秀的开源软件，在点云处理时可以根据实际要求开发合适的插件，在实际使用中，创建点云、保存点云、显示点云的操作较为基础，为了使这些操作得到总结，本文实现创建点云、保存并显示。

1.创建插件工程

 创建插件流程见：CloudCompare如何进行二次开发之插件开发？。
  本文创建的插件文件名：OperateData_1；
  CloudCompare中插件名：处理数据1。

2.代码编写

// This is an example of an action's method called when the corresponding action
// is triggered (i.e. the corresponding icon or menu entry is clicked in CC's  
// main interface). You can access most of CC's components (database,  
// 3D views, console, etc.) via the 'm_app' variable (see the ccMainAppInterface  
// class in ccMainAppInterface.h).  
void OperateData_1::doAction()  
{  
    if (m_app == nullptr)  
    {  
        // m_app should have already been initialized by CC when plugin is loaded  
        Q_ASSERT(false);  
    return;  
    }  
    //创建点云  
    ccPointCloud* myPc = new ccPointCloud(QString("myPc"));  
    int pointCount = 10000;//设置创建10000个点  
    myPc->reserve(pointCount);  
    for (size_t i = 0; i < pointCount; i++)  
    {  
        float angle = (i % 360)*3.1415926 / 180;  
        float x = 100 * cos(angle);  
        float y = 100 * sin(angle);  
        float z = int(i / 360) * 1;  
        const CCVector3* vcc = new CCVector3(x, y, z);  
        myPc->addPoint(*vcc);  
    }  
    //保存点云  
    QString dirPath = QFileDialog::getExistingDirectory(nullptr, "please select a saving path");  
    if (dirPath.isEmpty()) {  
        m_app->dispToConsole("The user did not select a folder.");  
        return;  
    }  
    QString filename =  QString(myPc->getName());  
    QFile file(dirPath + "\\" + filename + ".txt");  
    if (!file.exists()) {  
        file.open(QIODevice::ReadWrite | QIODevice::Text);  
        file.close();  
    }  
    file.open(QIODevice::Text | QIODevice::Truncate | QIODevice::WriteOnly);  
    QTextStream out(&amp;file);  
    int precision = 3;  
    for (int i = 0; i<myPc->size(); i++) {  
        float x = myPc->getPoint(i)->x;  
        float y = myPc->getPoint(i)->y;  
        float z = myPc->getPoint(i)->z;  
        out << QString("%1,%2,%3").arg(x, 0, 'r', precision).arg(y, 0, 'r', precision).arg(z, 0, 'r', precision) << endl;  
    }  
    file.close();  
    //显示点云  
    std::vector<ccHObject*> allCloud;  
    allCloud.push_back(myPc);  
    ccHObject* CloudGroup = new ccHObject(QString("CloudGroup"));  
    for (size_t i = 0; i < allCloud.size(); i++)  
    {  
        CloudGroup->addChild(allCloud[i]);  
    }  
    m_app->addToDB(CloudGroup);  
    m_app->refreshAll();  
    m_app->updateUI();  
}

3.显示点云

4.保存点云

参考资料：
[1] fandq1223. 创建点云文件、加载点云文件; 2016-11-15 [accessed 2023-04-17].
[2] 渡航奥. C/C++库函数及函数大全; 2019-09-05 [accessed 2023-04-17].

[3] 小修勾. 《QT+PCL 第一章》点云文件保存; 2022-03-20 [accessed 2023-04-17].
[4] 萘和. cloudCompare插件开发——保存点云颜色; 2021-08-13 [accessed 2023-04-17].
[5] kingkee. 【Qt】QString 格式化参数; 2019-12-01 [accessed 2023-04-17].