3d激光雷达开发（pcd数据读取）

        之前谈到了，如果从lidar获取数据，那么需要保存成pcd的形式。那么如何从pcd加载数据，其实方法也是一样的。相关内容可以参考这个链接​​​​​​​

​​https://pcl.readthedocs.io/projects/tutorials/en/master/reading_pcd.html#reading-pcd​​

1、编写pcd_read.cpp文件

#include <iostream>
 #include <pcl/io/pcd_io.h>
 #include <pcl/point_types.h>
 
 int
 main ()
 {
   pcl::PointCloud<pcl::PointXYZ>::Ptr cloud (new pcl::PointCloud<pcl::PointXYZ>);
 
  if (pcl::io::loadPCDFile<pcl::PointXYZ> ("test_pcd.pcd", *cloud) == -1) //* load the file
  {
    PCL_ERROR ("Couldn't read file test_pcd.pcd \n");
    return (-1);
  }
  std::cout << "Loaded "
            << cloud->width * cloud->height
            << " data points from test_pcd.pcd with the following fields: "
            << std::endl;
  for (const auto& point: *cloud)
    std::cout << "    " << point.x
              << " "    << point.y
              << " "    << point.z << std::endl;

  return (0);
}

2、编写CMakeLists.txt

cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
 
 project(pcd_read)
 
 find_package(PCL 1.2 REQUIRED)
 
 include_directories(${PCL_INCLUDE_DIRS})
 link_directories(${PCL_LIBRARY_DIRS})
 add_definitions(${PCL_DEFINITIONS})

add_executable (pcd_read pcd_read.cpp)
target_link_libraries (pcd_read ${PCL_LIBRARIES})

3、准备生成sln文件

mkdir build
cd build
cmake ..

        不出意外，应该可以正常编译通过

4、运行pcd_read.exe

        在运行前，有两个事情需要注意一下：第一，保证exe需要的dll都已经拷贝到当前目录下面；第二，保证test_pcd.pcd文件已经准备好。如果一切ok，就会得到下面这些输出，