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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!
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.
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.
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.
Asked: 2011-07-19 04:35:18 -0500
Seen: 14,700 times
Last updated: Aug 31 '18
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