Programming for Robotics, Lecture 2: Your first ROS package
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- čas přidán 2. 08. 2024
- The second lecture in the series 'Programming for Robotics', discusses ROS package structure; Integration and programming with Eclipse; ROS C++ client library (roscpp); ROS subscribers and publishers; ROS parameter server and RViz visualization
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I like how Eth made this public.
A good resource for Eclipse with ROS, where the catkin project is compiled by command line and edited in Eclipse(Auto complete and function check). Start from 1:05:48
I'm having issues with the \scan topic not receiving any messages. rostopic echo /scan says "WARNING: no messages received and simulated time is active". As I result, I don't see any scan data on rviz even if I place some objects in front of the robot in Gazebo. However, the point cloud data works fine. Do you have any suggestions? Thank you.
Update: I was able to resolve this by installing the missing ROS packages. My recent OS update had removed some of them. Basically, look for the errors that come up during roslaunch and try to install the indicated packages with apt install ros-- where is kinetic, noetic, etc. and could be, say, geographic-msgs.
What point cloud data are you talking about here? Is it the node /pointcloud_to_laserscan? Also what do you mean when you say that works fine?
On a side note, is this related to the bonus questions of publishing the 3D point cloud? If so, for some reason I am unable to see any topics that publish this 3D point cloud.
/pointcloud_to_laserscan only publishes on the /scan topic.
You answer was awesome! I just got stuck the same problem as yours. It reports "...Failed to load plugin libgazebo_ros_velodyne_laser.so...", after referring to your solution and with command "sudo apt install ros-noetic-velodyne*", it works. Thank you!
When I rostopic echo /scan, it doesn't show anything!
So my Rviz does not show the points
1:16:15
He was shocked