Converting different pcl datatypes

edit

Hello fellow Poinclouduser!

I relativy new to pcl. I have a problem converting some pcl datateypes and publishing them in ROS-Topics. I wrote a node which segments incoming pointclouds and now I like to see the result of course. The incoming pointcloud is from type PointNormal. I like to test my segmentation with pcl::regiongrowing. Here is my code:

void segmentScene(){
pcl::PointCloud<pcl::PointXYZ>::Ptr surface_xyz (new pcl::PointCloud<pcl::PointXYZ>);
pcl::PointCloud<pcl::Normal>::Ptr surface_only_normals (new pcl::PointCloud<pcl::Normal>);

pcl::copyPointCloud(*surface_normals, *surface_xyz);
pcl::copyPointCloud(*surface_normals, *surface_only_normals);

pcl::RegionGrowing<pcl::PointXYZ, pcl::Normal> regionGrowing;
std::vector <pcl::PointIndices> clusters;

//Here comes the whole stuff for preparing the regiongrowing class like minium cluster size and so on

regionGrowing.extract (clusters);
pcl::PointCloud<pcl::PointXYZRGB>::Ptr surface_coloured (new pcl::PointCloud<pcl::PointXYZRGB>);
surface_coloured= regionGrowing.getColoredCloud();
sensor_msgs::PointCloud2 msg_rgb_out;

pcl::toROSMsg(*surface_coloured, msg_rgb_out);
sensor_msgs::PointCloud2::Ptr msg_rgb_out_ptr(new sensor_msgs::PointCloud2(msg_rgb_out));
pubPCRvizOut.publish(msg_rgb_out_ptr);}

After running my code, I get this error message:

segmentation: /usr/include/boost/smart_ptr/shared_ptr.hpp:646: typename boost::detail::sp_dereference<t>::type boost::shared_ptr<t>::operator() const [with T = pcl::PointCloud<pcl::pointxyzrgba>; typename boost::detail::sp_dereference<t>::type = pcl::PointCloud<pcl::pointxyzrgba>&]: Assertion `px != 0' failed. [segmentation-3] process has died [pid 6995, exit code -6, cmd /home/osboxes/ROS/catkin_workspace/devel/lib/pf_matching_core/segmentation __name:=segmentation __log:=/home/osboxes/.ros/log/621ba038-b55c-11e6-8e7a-0800277b3835/segmentation-3.log]. log file: /home/osboxes/.ros/log/621ba038-b55c-11e6-8e7a-0800277b3835/segmentation-3.log

When commenting out pcl::toROSMsg it works all just fine. I get different clusters and so on. I am hoping someone can help me with this issue.

Thanks so much in advance!