robotics-simulation

Is your feature request related to a problem? Please describe.
Additionally to the speed of on object on which a GPS is located, I wish to know in which direction the object is moving.

Describe the solution you'd like
I would like to get the speed vector of the GPS.

Describe alternatives you've considered
I currently derivative by hand the position that the GPS return from one

Hi all,

I have looked into the marker example and according to the description in line 47, the commands from line 47-63 should modify the existing marker. However in reality, new markers are created.

Reason is the id 0 that is being set for the first marker: [this line](https://github.com/osrf/gaze

Ignition Gazebo offers many out-of-box controllers with different features and intended use cases, for example:

• [JointController](https://ignitionrobotics.org/api/gazebo/5.1/classignition_1_1gazebo_1_1systems_1_1Join

The <polyline> element should be supported as a geometry when loading elements via the C++ API.

The tutorial to install Gazebo from source for Gazebo >= 9 in https://github.com/osrf/gazebo_tutorials/blob/master/install_from_source/tutorial_default.md#dart-support reports some Trusty-specific steps (adding ``ppa:libccd-debsandppa:fcl-debs`) that however do not make sense as Gazebo >= 9 does not support Trusty.

This steps may be confusing for users that try to install this PPA in non-T