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   | #include <iostream> //标准输入输出流 #include <pcl/io/pcd_io.h> //PCL的PCD格式文件的输入输出头文件 #include <pcl/point_types.h> //PCL对各种格式的点的支持头文件
 
 
 
 
  int main (int argc, char** argv) {   if (argc != 2)    {     std::cerr << "please specify command line arg '-f' or '-p'" << std::endl;     exit(0);   } 	   pcl::PointCloud<pcl::PointXYZ> cloud_a, cloud_b, cloud_c;  	   pcl::PointCloud<pcl::Normal> n_cloud_b;    pcl::PointCloud<pcl::PointNormal> p_n_cloud_c; 
       cloud_a.width  = 5;    cloud_a.height = cloud_b.height = n_cloud_b.height = 1;    cloud_a.points.resize (cloud_a.width * cloud_a.height);    if (strcmp(argv[1], "-p") == 0)    {     cloud_b.width  = 3;      cloud_b.points.resize (cloud_b.width * cloud_b.height);   }   else{     n_cloud_b.width = 5;      n_cloud_b.points.resize (n_cloud_b.width * n_cloud_b.height);   }   for (size_t i = 0; i < cloud_a.points.size (); ++i)    {     cloud_a.points[i].x = 1024 * rand () / (RAND_MAX + 1.0f);     cloud_a.points[i].y = 1024 * rand () / (RAND_MAX + 1.0f);     cloud_a.points[i].z = 1024 * rand () / (RAND_MAX + 1.0f);   }   if (strcmp(argv[1], "-p") == 0)     for (size_t i = 0; i < cloud_b.points.size (); ++i)      {       cloud_b.points[i].x = 1024 * rand () / (RAND_MAX + 1.0f);       cloud_b.points[i].y = 1024 * rand () / (RAND_MAX + 1.0f);       cloud_b.points[i].z = 1024 * rand () / (RAND_MAX + 1.0f);     }   else      for (size_t i = 0; i < n_cloud_b.points.size (); ++i)      {       n_cloud_b.points[i].normal[0] = 1024 * rand () / (RAND_MAX + 1.0f);       n_cloud_b.points[i].normal[1] = 1024 * rand () / (RAND_MAX + 1.0f);       n_cloud_b.points[i].normal[2] = 1024 * rand () / (RAND_MAX + 1.0f);     }
  	   std::cerr << "Cloud A: " << std::endl;   for (size_t i = 0; i < cloud_a.points.size (); ++i)      std::cerr << "    " << cloud_a.points[i].x << " " << cloud_a.points[i].y << " " << cloud_a.points[i].z << std::endl;
    std::cerr << "Cloud B: " << std::endl;    if (strcmp(argv[1], "-p") == 0)      for (size_t i = 0; i < cloud_b.points.size (); ++i)       std::cerr << "    " << cloud_b.points[i].x << " " << cloud_b.points[i].y << " " << cloud_b.points[i].z << std::endl;   else      for (size_t i = 0; i < n_cloud_b.points.size (); ++i)       std::cerr << "    " << n_cloud_b.points[i].normal[0] << " " << n_cloud_b.points[i].normal[1] << " " << n_cloud_b.points[i].normal[2] << std::endl;
       if (strcmp(argv[1], "-p") == 0)   {     cloud_c  = cloud_a;     cloud_c += cloud_b;      std::cerr << "Cloud C: " << std::endl;      for (size_t i = 0; i < cloud_c.points.size (); ++i)        std::cerr << "    " << cloud_c.points[i].x << " " << cloud_c.points[i].y << " " << cloud_c.points[i].z << " " << std::endl;   }   else    {     pcl::concatenateFields (cloud_a, n_cloud_b, p_n_cloud_c);      std::cerr << "Cloud C: " << std::endl;     for (size_t i = 0; i < p_n_cloud_c.points.size (); ++i)        std::cerr << "    " <<         p_n_cloud_c.points[i].x << " " << p_n_cloud_c.points[i].y << " " << p_n_cloud_c.points[i].z << " " <<         p_n_cloud_c.points[i].normal[0] << " " << p_n_cloud_c.points[i].normal[1] << " " << p_n_cloud_c.points[i].normal[2] << std::endl;   }
    return (0); }
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