In this animation I use a square that rotates about the center of the coordinate system.
The anim05.*.jvx files created by utility xvc2jvx were used as keyframes for JavaView animation. JavaView applet uses default parameters with
<param name=Animation.firstKey value=1>
<param name=Animation.lastKey value=21>
<param name="Animation.framesPerSecond" value=12>