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Old 12-20-2011, 03:44 AM
nihohit nihohit is offline
Join Date: Nov 2011
Posts: 16
Jitter & gradual decline in y value

I'm using the code

def updateView():
pptPOS = tracker.getPosition()

vizact.onupdate(viz.PRIORITY_DEFAULT, updateView)

and later on, in a different function

viewPOS = viz.MainView.getPosition()

which is a simple code to make the avatar look at the main POV.

Alas, the code doesn't work. When the function needs to be called, the avatar's head jitters and gradually descends, until the helmet moves significantly, when it jumps back up and then returns to the jitter-and-descent routine.

Attached in the files is a graph of the result of getPosition over time - notice that the Y line is gradually descending and more jittery then the other lines - which makes me believe this isn't a problem with the code.

Any ideas?
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Old 12-20-2011, 09:48 AM
Jeff Jeff is offline
WorldViz Team Member
Join Date: Aug 2008
Posts: 2,471
How did you generate the graph, I'm not able to tell from looking at that how much the Y position changed?

Can you post a simple example script that replicates your problem?

Do you notice any jitter with the viewpoint or that the viewpoint is dropping over time? If not, there's probably some problem with the code.
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Old 12-21-2011, 01:35 PM
nihohit nihohit is offline
Join Date: Nov 2011
Posts: 16
The view doesn't jitter and move. The graph was made using print viz.MainView.getPosition() every frame, and the decline is from ~1.3 to ~0.3.

I will copy the code when in the lab.
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