WorldViz User Forum - simple VRPN question

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- Precision Position Tracker (PPT) (https://forum.worldviz.com/forumdisplay.php?f=9)

- - simple VRPN question (https://forum.worldviz.com/showthread.php?t=2182)

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

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)

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?