WorldViz User Forum - Why does tut

I'm trying to make a simulation of light coming from a laser diode (it's generally a cone shape). I figured I could use the tut_cone model and change its domensions. But when I change the cone's scale the cone will move somewhere else. Why won't it stay still?

Below is a program that illustrates my problem. The cone is supposed to be in front of the on-the-fly object there. The slider is only supposed to change the scale of the bottom of the cone (the circle).

Code:

import viz

import vizmenu

import math



viz.MainView.setPosition(0,0,-4)



viz.go()



viz.clearcolor(0.5, 0.5, 1)



#on-the-fly diode model

diode = viz.add( 'cylinder.wrl')

diode.color(0.5, 0.5, 0)

diode.scale(2, 0.1, 2)

diode.rotate(0, 0, 90)



diode1 = diode.add( 'cylinder.wrl')

diode1.color(0.5, 0, 0)

diode1.scale(.6, 1.5, .6)

diode1.setPosition(0, -.75, 0)



leg1 = diode.add('cylinder.wrl')

leg1.color(1, 0.3, 0.2)

leg1.scale(0.1, 7, 0.1)

leg1.setPosition(0.03, 0.5, 0)

leg2 = diode.add('cylinder.wrl')

leg2.color(1, 0.3, 0.2)

leg2.scale(0.1, 7, 0.1)

leg2.setPosition(-0.03, 0.5, 0)

leg3 = diode.add('cylinder.wrl')

leg3.color(1, 0.3, 0.2)

leg3.scale(0.1, 7, 0.1)

leg3.setPosition(0, 0.5, 0.03)

leg4 = diode.add('cylinder.wrl') 

leg4.color(1, 0.3, 0.2)

leg4.scale(0.1, 7, 0.1)

leg4.setPosition(0, 0.5, -0.03)



#Here's the problem area

cone = diode.add('tut_cone.wrl')

cone.translate(0, 0, 0)

cone.scale(1, 1, 1)



slider = viz.add(viz.SLIDER, parent=viz.SCREEN)

slider.setPosition(.5, .85)



def onSlider(obj,pos):

        if obj == slider:

                cone.setScale(pos, 1, pos)



viz.callback(viz.SLIDER_EVENT,onSlider)