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What is the difference between geometry and tf quaternions?

asked 2011-07-19 04:35:18 -0500

updated 2014-01-28 17:10:03 -0500

ngrennan gravatar image

I am trying to create a geometry_msgs::Quaternion from two other (to create an Odometry message). I've found that tf::Quaternion is a btQuaternion but it is not a geometry_msgs one. I would like to know which is the difference and how can I work if I only have geometry_msgs::Quaternion inputs and outputs. Thanks!

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answered 2011-07-19 04:44:24 -0500

tfoote gravatar image

updated 2014-01-27 17:54:42 -0500

They represent the same data. There are different libraries which support native processing of each of them.

There are conversion methods such as to and from message datatypes for your convenience.

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Thank you !
martimorta gravatar imagemartimorta ( 2011-07-20 00:31:23 -0500 )edit

What's the method for the geometry classes in tf2? I found my way to [tf2::convert](http://docs.ros.org/api/tf2/html/convert_8h.html), but that doesn't seem to do quite the right thing.

mikepurvis gravatar imagemikepurvis ( 2013-11-14 16:08:57 -0500 )edit

Hi can you please update the broken links?

NickSpeal gravatar imageNickSpeal ( 2014-01-27 16:36:58 -0500 )edit
1

I've updated the links.

tfoote gravatar imagetfoote ( 2014-01-27 17:54:56 -0500 )edit
2

answered 2018-08-31 09:58:55 -0500

-LD- gravatar image

As a noob i always are happy if a "nice" answer is provided. One, that can be copy-pasted. Because most likely someone will find this question when searching for a solution for a similar problem. So, if i'm correct, this should do the required trick:

Both ways this is needed at the very beginning of the code:

#include <tf/transform_datatypes.h>

msg -> TF:

 quaternionMsgToTF(quat_msg , quat_tf);

tf -> msg

 quaternionTFToMsg(quat_tf , quat_msg);

Basically this is exactly what the answer above includes, just as a line of code for everyone who isn't (jet) able to read the code provided by the link.

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Asked: 2011-07-19 04:35:18 -0500

Seen: 11,058 times

Last updated: Aug 31 '18