Ask Your Question

Strange sensor_msgs/PointCloud2 MD5 signatures

asked 2012-02-19 08:17:58 -0500

joq gravatar image

I am working on some packages using both Electric and Fuerte (alpha). When I try to display the PointCloud2 output using rviz I get messages like this:

[ERROR] [1329681881.695481457]: Client [/rviz_1329681880853654796] wants topic /velodyne/pointcloud2 to have datatype/md5sum [sensor_msgs/PointCloud/d8e9c3f5afbdd8a130fd1d2763945fca], but our version has [sensor_msgs/PointCloud2/1158d486dd51d683ce2f1be655c3c181]. Dropping connection.

On both systems, the correct MD5sum seems to be:

$ rosmsg md5 sensor_msgs/PointCloud2

In both cases I am running the Debian binary rviz packages, not something I built myself. Any hints where to look for the d8e9c3f5afbdd8a130fd1d2763945fca signature?

edit retag flag offensive close merge delete


Looks like d8e9c3f5afbdd8a130fd1d2763945fca is the default PointCloud (not PointCloud2) message signature (googling for it seems to confirm that at least). Now, why rviz mixes them up of course is the more interesting question.

Stefan Kohlbrecher gravatar image Stefan Kohlbrecher  ( 2012-02-19 08:29:57 -0500 )edit

1 Answer

Sort by ยป oldest newest most voted

answered 2012-02-19 10:24:03 -0500

dornhege gravatar image

I think the simple explanation might be that you used a PointCloud display instead of a PointCloud2 display in rviz.

edit flag offensive delete link more


That was it. The display I had checked was "Point Cloud2 (PointCloud)", but what I intended was "PointCloud2 (PointCloud2)". Sorry for the silly question.

joq gravatar image joq  ( 2012-02-20 02:55:32 -0500 )edit

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Question Tools


Asked: 2012-02-19 08:17:58 -0500

Seen: 1,577 times

Last updated: Feb 19 '12