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how do you install perception_pcl in melodic in ubuntu?

asked 2020-01-27 01:18:16 -0500

AdamS gravatar image

updated 2020-01-27 01:20:11 -0500

I am trying to visualize pcd files and have been following this thread here to do it however I am not able to find the perception_pcl command in the rosrun meta commands.

Am I missing something, the documentation for it does not give me much to go on http://wiki.ros.org/perception_pcl

I have already tried sudo apt-get install ros-melodic-perception-pcl but it still does not show up

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Have you installed pcl-tools ? From your thread it seems that you need this and then visualize your pointcloud using the command pcl_viewer FILENAME.

Delb gravatar image Delb  ( 2020-01-27 02:06:54 -0500 )edit

Hey Delb, they were not installed. Where would I have gone to find what needed to be installed? i am testing this now to see if it works

AdamS gravatar image AdamS  ( 2020-01-27 03:21:31 -0500 )edit

@Delb that did it! Thank you!

AdamS gravatar image AdamS  ( 2020-01-27 03:24:29 -0500 )edit

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answered 2020-01-27 02:08:50 -0500

gvdhoorn gravatar image

updated 2020-01-27 03:42:24 -0500

Edit: pcd_viewer has not been part of perception_pcl since at least Hydro.

The tool is now called pcl_viewer and is part of the (stand-alone) PCL package: pcl-tools (at least on Debian/Ubuntu). It's not part of ROS.

See #q80836. The OP there answers his own question and states something similar.

Where in the ros.org would i have needed to go to find this bit of info?

I'm not sure this is a "ROS thing".

Please note that PCL is a stand-alone library. It's not a piece of ROS. There are packages that let you use it with ROS, but it's completely stand-alone, and it's development also happens outside of the ROS community.

The Q&A you linked is 8 years old. PCL has moved on, answers get stale. The wiki page you linked also makes no mention of the tool. Nor do any of the other pages about PCL-related packages (such as pcl_ros).

perception_pcl is actually a metapackage that facilitates installation of all ROS PCL wrapping packages. See the wiki page. It being a metapackage also explains why there isn't much content: it doesn't contain any nodes, messages or other ROS-related infrastructure.


Edit 2: I've updated the pcl_perception wiki page (diff) to point readers to pcl_ros and make it clear that package is just a metapackage. Not something that contains any code, libraries or nodes.


Original answer:

you're not giving us much information.

I have already tried sudo apt-get install ros-melodic-perception-pcl but it still does not show up

Did the package install? Did you get any errors? Something else? What is "it" here?

What is the output of dpkg -l | grep perception-pcl?

After source /opt/ros/melodic/setup.bash, what is the output of rospack find perception_pcl?

I am trying to visualize pcd files and have been following this thread here to do it however I am not able to find the perception_pcl command [..]

Please note: pcd_viewer would be the tool. pcl_perception is the package (which hosts the tool).

You cannot execute pcl_perception. Only pcd_viewer.

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Sorry im not sure how much or how little information is required here. I assume by your reply that the package i installed is the right one. The package did install and there was no problems that i was able to see.

Here is the output of your request

dpkg -l | grep perception-pcl
ii  ros-melodic-perception-pcl                   1.7.0-2bionic.20191211.062537                   amd64        PCL (Point Cloud Library) ROS interface stack.
metrolla@metrolla-ThinkPad-11e:~/catkin_ws$ source /opt/ros/melodic/setup.bash 
metrolla@metrolla-ThinkPad-11e:~/catkin_ws$ rospack find perception_pcl
[rospack] Error: package 'perception_pcl' not found
metrolla@metrolla-ThinkPad-11e:~/catkin_ws$

The thread i was looking at showed the following command. is this no longer correct?

rosrun perception_pcl pcd_viewer <filename>
AdamS gravatar image AdamS  ( 2020-01-27 03:17:31 -0500 )edit

@Delb pointed out that pcl-toolswas required for me to use pcl_viewer. this was the missing component. How would I have known what needed to be installed given this case? Where in the ros.org would i have needed to go to find this bit of info?

AdamS gravatar image AdamS  ( 2020-01-27 03:24:11 -0500 )edit

thanks for the insight. I am rather new to working with LiDAR but jumping headfirst into the deepend of ROS is a lot to digest. I actually thought it was part of ROS. Thank you for clarifying this.

AdamS gravatar image AdamS  ( 2020-01-27 03:35:31 -0500 )edit

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Asked: 2020-01-27 01:18:16 -0500

Seen: 357 times

Last updated: Jan 27