scan topic is empty ( topic not published yet)

[walid19]

I am trying to convert Pointcloud2 msg to laser scan, I mapped the input topic in the launch file . the out laser scan topic is empty ?.

[kungfrank]

Hello, I have the same problem. Did you solve it?

[walid19]

Hi not yet I am still struggling, plz if you fix it let me know

…

On Mon, Nov 11, 2019 at 6:17 PM Pou Chun, Kung ***@***.***> wrote: Hello, I have the same problem. Did you solve it? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#32?email_source=notifications&email_token=AFOSGPRLYHGAUSCIJ4SDTPDQTEPJFA5CNFSM4IF753HKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEDWFCNA#issuecomment-552358196>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AFOSGPW5WTUDS7BCVTNNUL3QTEPJFANCNFSM4IF753HA> .

[hynkis]

1. Try to run this command in terminal at first.
   rosrun pointcloud_to_laserscan pointcloud_to_laserscan_node cloud_in:="your pointcloud topic"
   and subscribe topic "/scan" (/scan is the default publish topic).

2. If it works, then it means pointcloud_to_laserscan package works and you need to change the parameters in the example launch file (simple_node.launch). In my case, "scan_time" parameter was too big(default 0.33, mine was 0.033). You can check the right parameters by 'rostopic echo' the message "/scan" when you run the 'rosrun' command above.

[walid19]

Thank you so much it works for me now :)

…

On Wed, Nov 20, 2019 at 2:03 AM Hyeon-Ki Seong ***@***.***> wrote: 1. Try to run this command in terminal at first. rosrun pointcloud_to_laserscan pointcloud_to_laserscan_node cloud_in:= and subscribe topic "/scan" (/scan is the default publish topic). 2. If it works, then it means pointcloud_to_laserscan package works and you need to change the parameters in the example launch file (simple_node.launch). In my case, "scan_time" parameter was too big(default 0.33, mine was 0.033). You can check the right parameters by 'rostopic echo' the message "/scan" when you run the 'rosrun' command above. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#32?email_source=notifications&email_token=AFOSGPXGUMKL7JIE5H2WXWDQUTOMJA5CNFSM4IF753HKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEEQ6ECY#issuecomment-555868683>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AFOSGPXBYVVQTGV7A65NT6LQUTOMJANCNFSM4IF753HA> .