This rather disturbing image was rendered with POV, but the cubic_spline
that controls the sphere_sweep was designed in Python.
#Python 2.33
from math import *
clock,count=0.0, 0
deltay= .7
amp, deltaamp=5, .98
diameter=1.5
while clock<2:
  clock=clock+.05
  count=count+1
  angley=sin(count/2)
  x=int(cos(angley)*count*1000)/1000.0
  z=int(sin(angley)*count*1000)/1000.0
  angley=angley+deltay
  deltay=deltay*.98
  y=int(sin(amp)*count*1000)/1000.0
  amp=amp*deltaamp
  deltaamp=deltaamp*.96
  diameter=diameter*.95
  print "<",x,",",y,",",z,">,",diameter

print
print count




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