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Old 03-05-2008, 04:04 PM
nige777 nige777 is offline
Join Date: Nov 2007
Location: UK
Posts: 78
Body linking

I'm developing a training environment where the user must operate a fork lift truck and be able to get on and off. I have set up the fork lift using physics joints and motors so that it "behaves" correctly, which it does-to a certain, pretty much.
Firstly when I pick up the objects with the forks that need loading and stacking (cages made with collideBox's top and bottom) there is a noticeable 'wobble', to the point when it looks unrealistic. Is this a trade off of using a bunch of dynamic physics shapes held together with physics joints?
Secondly when linking the viewpoint to the fork lift I loose control of the head, I presume it is the head_ori that is linked is it? I have tried using setMask but to no avail.I have tried using this:
def onTimer(num):
#    #The timer with the id 'num' has expired
    if num == 0:
        #Link matrix of runners to forks(turning)
        turn = run.getMatrix()
which does what I want but produces REALLY bad juddering when the truck is moving.

Am I missing something really simple here?


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Old 03-06-2008, 09:05 AM
nige777 nige777 is offline
Join Date: Nov 2007
Location: UK
Posts: 78

Hi all wizards,

Juddering experienced whilst moving has been improved by tweaking setStepSize and setAccuracy, although it is not perfect (yet), and the cages still cause the forks to wobble, I am more confident that I can achieve acceptable results.

Take it easy
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Old 03-06-2008, 09:27 AM
farshizzo farshizzo is offline
WorldViz Team Member
Join Date: Mar 2003
Posts: 2,849
The following code should link to rotation of the fork lift to the view body:
bodyLink =,viz.MainView,mask=viz.LINK_ORI,dstFlag=viz.LINK_BODY)
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Old 03-06-2008, 02:17 PM
nige777 nige777 is offline
Join Date: Nov 2007
Location: UK
Posts: 78
Nice 1

Cheers man,

ended up using
bodyLink =,view,dstFlag=viz.LINK_BODY)
as the exact line of code you gave me only linked the orientation of the body(or head?) i think as the view didn't move with the truck, but hey, thanks again for your help.

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