Simple demonstration of time-varying data.

data/mksnakeanim.pl

+#! /usr/bin/perl
+
+$NSTEPS = 32;
+$RMIN = 0.1;
+$RMAX = 0.5;
+$NDOTS = 15;
+$THETAMAX = 3.14159;
+
+printf "#! /usr/bin/env partiview
+
+# Generated by mksnake.pl
+
+datavar 0 lum
+datavar 1 color
+
+eval lum lum %d 0
+eval color color
+
+eval slum 1000
+
+eval speed 8
+
+
+", $NDOTS+2;
+
+
+
+for($time = 0; $time <= $NSTEPS; $time++) {
+    $tfrac = $time / $NSTEPS;
+
+    printf "\n";
+    printf "datatime %d\n", $time;
+
+    for($i = 0; $i < $NDOTS; $i++) {
+	$r = $RMIN + ($RMAX-$RMIN) * $i/$NDOTS;
+
+	$theta = $tfrac * $THETAMAX * sqrt($RMAX / $r);
+
+	printf "%g %g %g	%d %g\n", $r*cos($theta), $r*sin($theta), 0, $i, $theta;
+    }
+}

data/snakeanim.speck

+#! /usr/bin/env partiview
+
+# Generated by mksnakeanim.pl
+
+datavar 0 lum
+datavar 1 color
+
+eval lum lum 17 0
+eval color color
+
+eval slum 1000
+
+eval speed 8
+
+
+
+datatime 0
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+
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