WorldViz User Forum  

Go Back   WorldViz User Forum > Vizard

Reply
 
Thread Tools Rate Thread Display Modes
  #1  
Old 08-28-2008, 02:34 PM
whj whj is offline
Member
 
Join Date: Apr 2008
Posts: 60
animation question

hi,

I'm trying to create an animation of a moving car. Animation path seems to be a handy way. But I also want to change the speed of the car or even stop the car when some event occurs. I don't see any control of speed is available to the animation path. Does anyone have an idea how to do it?

Thanks a lot.
whj
Reply With Quote
  #2  
Old 08-28-2008, 04:31 PM
Jeff Jeff is offline
WorldViz Team Member
 
Join Date: Aug 2008
Posts: 2,471
With animation paths you can change the speed of the animation or you can pause an animation. To reduce the speed by half

path = viz.add(viz.ANIMATION_PATH)
path.speed(.5)

to pause the animation

path.pause()
Reply With Quote
  #3  
Old 08-29-2008, 03:01 PM
whj whj is offline
Member
 
Join Date: Apr 2008
Posts: 60
Thank you.
Reply With Quote
  #4  
Old 09-05-2008, 10:16 AM
whj whj is offline
Member
 
Join Date: Apr 2008
Posts: 60
Hi, I have another question on animation path.

When I use path.autorotate(), all my cars move along their current trajectory, which is great. But some of them move forward, and some of them move backward. I don't know how to control the rotation of the objects when I use animation path. The following is my code:

mybus = viz.add('schoolbus.3ds')
path = viz.add(viz.ANIMATION_PATH)

positions = [ [-40,1.25,-4], [-30,1.25,-3], [-20,1.25,-2], [-10,1.25,-6], [0,1.25,-30], [10,1.25,-10], [20,1.25,7], [30,1.25,-10], [50,1.25,2] ]
for x in range(0,len(positions)):
cp = viz.add(viz.CONTROL_POINT)
cp.setPosition(positions[x])
path.add(cp,x+1)
path.constantspeed(viz.ON,CAR_SPEED)

path.loop(viz.LOOP)
path.translatemode(viz.BEZIER)
path.setAutoRotate(viz.ON)
mybus.link(path)
path.play()


Thanks,
Reply With Quote
  #5  
Old 09-08-2008, 09:21 AM
Jeff Jeff is offline
WorldViz Team Member
 
Join Date: Aug 2008
Posts: 2,471
Since there is a link between the animation path and the car you can offset the car's position or orientation from the path's. If I understand correctly you want to offset the orientation so that the car is facing the opposite direction. Here is some code that takes 2 wheelbarrows and animates them along a path. The second wheelbarrow will get rotated so it faces the opposite direction. Then its position is offset slighty from the path so it appears below the first one. Let me know if that helps.

Code:
import viz
viz.go()

wheel1 = viz.add('wheelbarrow.ive')
wheel2 = viz.add('wheelbarrow.ive')

path = viz.add(viz.ANIMATION_PATH)

positions = [[0,0,10],[5,0,10],[5,0,15],[0,0,15]]

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

path.loop(viz.LOOP)

path.translatemode(viz.BEZIER)

path.setAutoRotate(viz.ON)

#link the first wheelbarrow to the path
wheel1.link(path)

#link the second wheelbarrow to the path then
#offset the wheelbarrow's orientation so it is opposite the path 
#and offset its position from the path so it will be 
#below the first wheelbarrow

wheel2link = viz.link(path, wheel2)
wheel2link.preEuler([180,0,0])
wheel2link.preTrans([0,-1,0])

path.play()
Reply With Quote
  #6  
Old 09-08-2008, 12:13 PM
whj whj is offline
Member
 
Join Date: Apr 2008
Posts: 60
Thank you, Jeff. That works very well.
Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
General question and question regarding arrays dan12345 Vizard 1 01-15-2008 10:15 AM
Animation Tracks.... k_iwan Vizard 2 03-26-2007 05:52 PM
Jumpy animation Elizabeth S Vizard 1 11-08-2006 02:11 PM
avatar animation problems jrodman Vizard 1 01-18-2006 09:12 AM
to rephrase my question... shai Vizard 2 10-27-2004 10:55 AM


All times are GMT -7. The time now is 07:43 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright 2002-2023 WorldViz LLC