concatenate point

To concatenate two point clouds using the Point Cloud Library (PCL), you can use the `pcl::concatenatePointCloud` function. This function allows you to combine multiple point clouds into a single point cloud.

Here is an example code snippet showing how to concatenate two point clouds:

#include <pcl/point_cloud.h>
#include <pcl/common/concatenate.h>

// Define two point clouds
pcl::PointCloud<pcl::PointXYZ>::Ptr cloud1(new pcl::PointCloud<pcl::PointXYZ>);
pcl::PointCloud<pcl::PointXYZ>::Ptr cloud2(new pcl::PointCloud<pcl::PointXYZ>);

// Populate the point clouds with data

// Concatenate the point clouds
pcl::PointCloud<pcl::PointXYZ>::Ptr concatenatedCloud(new pcl::PointCloud<pcl::PointXYZ>);
pcl::concatenatePointCloud(*cloud1, *cloud2, *concatenatedCloud);

// Now, the concatenatedCloud contains the merged point clouds

In this example, `cloud1` and `cloud2` are two separate point clouds of type `pcl::PointCloud<pcl::PointXYZ>`. After populating these point clouds with the desired data, you can use `pcl::concatenatePointCloud` to concatenate them into `concatenatedCloud`. The resulting point cloud `concatenatedCloud` will contain all the points from both `cloud1` and `cloud2`.

Make sure you have included the necessary PCL headers and have populated the individual point clouds with valid data before attempting to concatenate them.