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Old 10-13-2009, 01:27 PM
whj whj is offline
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Join Date: Apr 2008
Posts: 60
positions on animation path

Hi, I would like to create an environment in which a ball is going around the original point. My simple code just create an animation path of a circle for a ball and try to figure out the actual positions when the ball pass along the animation path. My question is why the printed positions are not on a circle like what we can see? And so why the distance between the ball and the original point are not the constant value 10? Thanks!


Code:
import viz
viz.go()

import math

viz.add('tut_ground.wrl')
ball = viz.add('ball.wrl')

viz.MainView.move([0,3,-20])

path = viz.addAnimationPath()
positions = [ [0,1,10], [10,1,0], [0,1,-10], [-10,1,0], [0,1,10] ]
for x in range(len(positions)):
	cp = viz.add(viz.CONTROL_POINT)
	cp.setPosition(positions[x])
	path.add(cp,x+1)

path.loop(viz.CIRCULAR)
viz.CUBIC_BEZIER
path.translatemode(viz.BEZIER)
path.computetangents()
path.setAutoRotate(viz.ON)

mylink = viz.link(path,ball)
path.play()

def mytimer(num):
	pc = ball.getPosition()
	print 'position: ', pc

	dist = math.sqrt( (pc[0]-0.0)*(pc[0]-0.0) + (pc[2]-0.0)*(pc[2]-0.0) )
	print 'distance: ', dist

	
viz.callback(viz.TIMER_EVENT, mytimer)
viz.starttimer(0,1/60.0,viz.FOREVER)
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