Frame and mounting of a conveyor belt (see <a href="//commons.wikimedia.org/wiki/File:Chassis_elevateur_bande_persp.svg" title="File:Chassis elevateur bande persp.svg">File:Chassis elevateur bande persp.svg</a>): trajectories of points relative to a given solid; the reference solid is shown by a webcam.
<ul><li>Blue: simple trajectories (straight line, circle);</li>
<li>magenta: complex trajectory.</li></ul>
<ul><li><a href="//commons.wikimedia.org/wiki/File:Osa_camera-web.svg" class="mw-redirect" title="File:Osa camera-web.svg">Osa_camera-web.svg</a>: OSA</li>
<li><a href="//commons.wikimedia.org/wiki/File:Elevateur_bande_positions_extremes.svg" title="File:Elevateur bande positions extremes.svg">Elevateur_bande_positions_extremes.svg</a>: <a href="//commons.wikimedia.org/wiki/User:Cdang" title="User:Cdang">Cdang</a></li>
<li>derivative work: <a href="//commons.wikimedia.org/wiki/User:Cdang" title="User:Cdang">Cdang</a> (<a href="//commons.wikimedia.org/wiki/User_talk:Cdang" title="User talk:Cdang"><span class="signature-talk">talk</span></a>)</li></ul>
CC BY-SA 3.0
<ul><li><a href="//commons.wikimedia.org/wiki/File:Osa_camera-web.svg" class="mw-redirect" title="File:Osa camera-web.svg">Osa_camera-web.svg</a></li>
<li><a href="//commons.wikimedia.org/wiki/File:Elevateur_bande_positions_extremes.svg" title="File:Elevateur bande positions extremes.svg">Elevateur_bande_positions_extremes.svg</a></li></ul>