using sensor.

[hahaho]

Hi worldviz
i want to use sensor of three.
so, i make a code following.

vrpn = viz.add('vrpn7.dle')
tracker1 = vrpn.addTracker('PPT0@166.104.29.228',0)
tracker2 = vrpn.addTracker('PPT0@166.104.29.228',1)
tracker3 = vrpn.addTracker('PPT0@166.104.29.228',2)

def update():
position1 = tracker1.getPosition()
position2 = tracker2.getPosition()
position3 = tracker3.getPosition()

a = position1[0]
a1 = position1[1]
a2 = position1[2]
#print a1
b = position2[0]
b1 = position2[1]
b2 = position2[2]
print b1
c = position3[0]
c1 = position3[1]
c2 = position3[2]
#print c1
vizact.ontimer(0,update)

but !! the location of sensor is frequently change.
How can i ??