PCL点云显示

利用pcl库来显示点云

1. CMakeLists.txt

cmake_minimum_required(VERSION 2.8 FATAL_ERROR)  
  
project(show_pointcloud)  
  
find_package(PCL 1.7 REQUIRED)  
  
include_directories(${PCL_INCLUDE_DIRS})  
link_directories(${PCL_LIBRARY_DIRS})  
add_definitions(${PCL_DEFINITIONS})  
  
add_executable (show_pointcloud show_pointcloud.cpp)  
target_link_libraries (show_pointcloud ${PCL_LIBRARIES}) 

2. show_pointcloud.cpp

    #include <pcl/visualization/cloud_viewer.h>  
    #include <iostream>  
    #include <pcl/io/io.h>  
    #include <pcl/io/pcd_io.h>  
          
    int user_data;  
          
    void   
    viewerOneOff (pcl::visualization::PCLVisualizer& viewer)  
    {  
        viewer.setBackgroundColor (1.0, 0.5, 1.0);
        pcl::PointXYZ o;  
        o.x = 1.0;  
        o.y = 0;  
        o.z = 0;  
        viewer.addSphere (o, 0.25, "sphere", 0);  
        std::cout << "i only run once" << std::endl;  
          
    }  
          
    void   
    viewerPsycho (pcl::visualization::PCLVisualizer& viewer)  
    {  
        static unsigned count = 0;  
        std::stringstream ss;  
        ss << "Once per viewer loop: " << count++;  
        viewer.removeShape ("text", 0);  
        viewer.addText (ss.str(), 200, 300, "text", 0);  
          
        //FIXME: possible race condition here:  
        user_data++;  
    }  
          
    int   
    main ()  
    {  
        pcl::PointCloud<pcl::PointXYZRGBA>::Ptr cloud (new pcl::PointCloud<pcl::PointXYZRGBA>);  
        pcl::io::loadPCDFile ("./../map.pcd", *cloud);
          
        pcl::visualization::CloudViewer viewer("Cloud Viewer");  
          
        //blocks until the cloud is actually rendered  
        viewer.showCloud(cloud);  
          
        //use the following functions to get access to the underlying more advanced/powerful  
        //PCLVisualizer  
          
        //This will only get called once  
        viewer.runOnVisualizationThreadOnce (viewerOneOff);  
          
        //This will get called once per visualization iteration  
        viewer.runOnVisualizationThread (viewerPsycho);  
        while (!viewer.wasStopped ())  
        {  
        //you can also do cool processing here  
        //FIXME: Note that this is running in a separate thread from viewerPsycho  
        //and you should guard against race conditions yourself...  
        user_data++;  
        }  
        return 0;  
    }  

3. 显示的结果