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  #1  
Old 07-23-2009, 12:57 PM
mjabon mjabon is offline
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Join Date: Jul 2007
Posts: 63
simple VRPN question

Hello. We have a problem doing the most simple thing with VRPN, which is tracking just one light on the head to move you through the world. In our old code we simply wrote:

Code:
viz.go(viz.PROMPT | (viz.HMD + viz.STEREO + viz.TRACKER))
if viz.get(viz.TRACKER):
	PORT_PPT = 1
	viz.cursor(viz.OFF)
	viz.mouse(viz.OFF)
	ppt = viz.add('vizppt.dls')
	#Average over 5 samples
	ppt.command(5,'',5)
	isense = viz.add('intersense.dls')
	viz.tracker()
	#Set eyeheight to zero since we are getting it from the tracker
	viz.eyeheight(1.9)
That is all we had to do.

I tried replacing it with this:

Code:
vrpn = viz.add('vrpn7.dle')
ppt = vrpn.addTracker('PPT0@HOSTNAME', 0)
Where hostname is the ip of our PPT machine. However, nothing tracks - ie the person does not move through the world. We don't get errors, the person just does not move.

Any ideas?
Maria
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  #2  
Old 07-23-2009, 04:06 PM
Jeff Jeff is offline
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Join Date: Aug 2008
Posts: 2,449
Could you show the code you use to link the VRPN tracker to the viewpoint?

What happens when you just try to print out the data in a timer function?
Code:
def showData():
	data = tracker.getData()  # Access the raw data 
	print data                # Print the array of data 

vizact.ontimer(0, showData)
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  #3  
Old 08-25-2009, 10:12 PM
mjabon mjabon is offline
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Join Date: Jul 2007
Posts: 63
We get data, it just does not move the person in the world. Does anyone have a simple script they could share that uses VRPN with 1 light on an HMD?
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