Object Attachments
==================

.. toctree::
   :maxdepth: 1

   Leaving a Trail <trail>
   Attach Arrow <attacharrow>
   Attach Light <attach_light>

* An object can leave a trail behind it as it moves.  

.. figure:: /images/binary_star.png

   A binary star system, showing two different types of trail.

* An arrow representing a vector quantity can be attached to an object, automatically updating as the object moves.

.. figure:: /images/attach_arrow.png

   The arrow represents the instantaneous velocity of the bouncing ball.

* To make a moving light, a light can also be attached to an object.

.. figure:: /images/attach_light.png