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<P>During animation the trip/back buttons can effectively be used to return to
a point in time where you want to return back to if you wanted to
browse around some specific point in time.
<P>You can spend most of the time moving in [o]rbit mode. Left-button
moves around chosen center; control-left pans around the sky.
As opposed to switching to 't' mode to zoom and translate,
you can also use SHIFT-Mouse-1 and SHIFT-Mouse-3 to achieve the same from
the other ('o', 'f') modes.
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<P>To make an animation, create an executable shell script <CODE>movie1</CODE> with
for example the following commands:
<BLOCKQUOTE><CODE>
<HR>
<PRE>
#! /bin/csh -f
#
echo step 0
echo update
echo snapshot
echo step 0.01
echo update
echo snapshot
echo step 0.02
echo update
echo snapshot
echo step 0.03
echo update
echo snapshot
...
</PRE>
<HR>
</CODE></BLOCKQUOTE>
the Control Command <CODE>async movie1</CODE>, and it will create files
<CODE>snap.000.sgi, snap.001.sgi, ....</CODE> and already with <CODE>xv</CODE> a movie
can be shown:
<BLOCKQUOTE><CODE>
<HR>
<PRE>
xv -wait 0 snap.???.sgi
</PRE>
<HR>
</CODE></BLOCKQUOTE>
<P>To make animated GIFs, here are some examples with common software,
all with a default 0.1 sec delay between frames. Some animation
software (e.g. xanim) can change these:
<BLOCKQUOTE><CODE>
<HR>
<PRE>
convert -delay 10 -loop 0 snap.???.sgi try1.gif
gifsicle -d 10 snap.???.gif > try2.gif
</PRE>
<HR>
</CODE></BLOCKQUOTE>
<P>The script will run asynchronously within partiview, so if you then
use the mouse to change orientation or zoom,
these actions (minus the location of the mouse of course)
will be nicely recorded in the snapshots.