[ROS Q&A] 151 – Rviz receives LaserScan messages but doesn’t display them

[ROS Q&A] 151 - Rviz receives LaserScan messages but doesn't display them

Written by Alberto Ezquerro

27/08/2018

 

In the video, we’ll show how to properly visualize LaserScan messages in RViz.

RELATED LINKS

Robot Ignite Academy
ROS Basics course
ROS Development Studio (ROSDS)
Original question

Step 0. Create a project in ROS Development Studio(ROSDS)

ROSDS helps you follow our tutorial in a fast pace without dealing without setting up an environment locally. If you haven’t had an account yet, you can create a free account here. Let’s create a new project and call it laser_qa.

Step 1. Clone the code and create a package

The questioner provides the code he used. Let’s clone it first.

cd catkin_ws/src
git clone http://github.com/erenaud3/fakeLaserScan.git

In the /launch/fakeLaserScan.launch file, please leave the node tag and comment out the others since we don’t need them. Then we can compile and run  the package

cd ~/catkin_ws
catkin_make
source devel/setup.bash
roslaunch beginner_tutorial fakeLaserScan.launch

To visualize the laser scan, we’ll use rviz

rosrun rviz rviz

After launching rviz, go to Tools->Graphical Tool. You’ll see the rviz window pops out.

In rviz, click Add->LaserScan to add a visualization. Then we select the topic /fakeScan, however, there is nothing.

It turns out the size of the display is too small. Please change it to a larger value. e.g. 0.1

You should see the visualization now.

Want to learn more?

If you are interested in learning more about ROS, please check our ROS Basic in 5 Days course.

Edit by: Tony Huang

 


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Topics: Laser scan | RViz
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