从CAD模型中提取单视角点云

现在需要从CAD模型中提取单视角点云。pcl提取单视角点云的函数名是renderViewTesselatedSphere，属于pcl::visualization::PCLVisualizer中的成员函数。

下面是关键代码：

/*+++++++++++++++++++++++++单视角点云获取+++++++++++++++++++++++++++++++*/
    vtkSmartPointer<vtkPolyData> polydata = vtkSmartPointer<vtkPolyData>::New();
    vtkSmartPointer<vtkSTLReader> readerQuery = vtkSmartPointer<vtkSTLReader>::New();
    //读取CAD模型
    readerQuery->SetFileName("aa.STL");
    readerQuery->Update();
    polydata = readerQuery->GetOutput();
    polydata->GetNumberOfPoints());

    //单视角点云获取
    float resx = 512;
    float resy = resx;
    std::vector<pcl::PointCloud<pcl::PointXYZ>, Eigen::aligned_allocator<pcl::PointCloud<pcl::PointXYZ> > > views_xyz;
    std::vector<Eigen::Matrix4f, Eigen::aligned_allocator<Eigen::Matrix4f> > poses;
    std::vector<float> entropies;
    pcl::visualization::PCLVisualizer vis;
    vis.addModelFromPolyData(polydata, "mesh", 0);
    vis.setRepresentationToSurfaceForAllActors();
    vis.renderViewTesselatedSphere(resx, resy, views_xyz, poses, entropies, 1, 90, 1, FALSE);
    for (int i = 0; i < views_xyz.size(); i++)
    {
        pcl::PointCloud<pcl::PointXYZ> views_cloud;
        pcl::transformPointCloud<pcl::PointXYZ>(views_xyz[i], views_cloud, poses[i]);

        std::stringstream ss;
        ss << "cloud_view_" << i << ".ply";
        pcl::io::savePLYFile(ss.str(), views_cloud);
    }



    while (!vis.wasStopped())
    {
    }
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该代码实现的是从一个cad模型中获取80个视角的点云。