add example scripts how the orion5 animation was created

data/orion5.csh

+#! /bin/csh -f
+#
+#    this is an example script that produces some orbit-around Orion.
+#    Typical steps:
+#   	$ orion5.csh > orion5.wf
+#	$ wf2movie.awk orion5.wf > orion5.sh
+#	$ chmod +x orion5.sh
+#	$ partiview hipbright
+#	Cmd: winsize 300 300
+#	Cmd: center 43 410 -9
+#	Cmd: async orion5.sh
+#	... (recording window, do not mess with screen or overlay other windows here)
+#	<ESC> to quit partiview when all snapshots have been recorded
+#	$ gifsicle -d 10 --colors 256 snap*gif > orion5a.gif
+#
+#	See http://bima.astro.umd.edu/nemo/amnh/movies/ for the results
+#
+# Note: You need partiview, starlab, NEMO and ImageMagic, at least to complete it
+#       the way the example was written.
+#
+
+
+#    first we first manually record the beginning and ending viewpoint, and 
+#    linearly  interpolate. There are other methods where you record a number
+#    of points and spline interpolate/smooth etc.etc. See numerical recipes
+#    for methods. The (a) and (b) vector are x,y,z,Rx,Ry,Rz for those two
+#    viewpoints, obtained with the "jump" command in partiview
+
+set a=(0.1 -1.5 -0.1  80 -100 -100)
+set b=(43 -3.8 -8.2   85.3 -127.6 -127.6)
+
+#    field of view
+set fov=60
+
+#    note you need NEMO for the nemoinp/tabmath programs....
+#    401 frames
+
+nemoinp 0:400 |\
+  tabmath - - "$a[1]+%1/200*($b[1]-$a[1]),$a[2]+%1/200*($b[2]-$a[2]),$a[3]+%1/200*($b[3]-$a[3]),$a[4]+%1/200*($b[4]-$a[4]),$a[5]+%1/200*($b[5]-$a[5]),$a[6]+%1/200*($b[6]-$a[6]),$fov" 1

data/wf2movie.awk

+#! /bin/awk -f
+#
+#
+#	awk script to convert a "wf" file into an "async" shell script
+#	to create snapshots from within partiview
+
+BEGIN {
+   print "###  this script automatically created with wf2movie.awk";
+   print "#echo center 43 409 -9";
+}
+
+{
+   print "echo jump ",$0
+   print "echo update"
+   print "echo snapset snap%03d.gif"
+   print "echo snapshot"
+}
+
+END {
+   print "# All done.";
+}