position tracking

[piyush]

i wrote following code for tracking position of ppt wand thru vrpn7 in vizard4
it is unable to track position but runs without any errors
import viz
viz.go()

piazza = viz.addChild('maze.osgb')
viz.MainView.move([3,2,8])

vrpn = viz.add('vrpn7.dle')
posTracker = vrpn.addTracker('PPT0@WORLDVIZ-PC',0)

#Connect to Intersense on local machine running Vizard
isense = viz.add('intersense.dle')
oriTracker = isense.addTracker()

#Create a 6DOF tracker by merging position data from PPT with
#Orientation data from Intersense
headTracker = viz.mergeLinkable(posTracker,oriTracker)

#Link viz.MainView with headTracker
headlink = viz.link(headTracker, viz.MainView)

#Once the user is facing PPT north pressing the 'r' key will align
#Intersense's coordinate system with PPT's coordinate system
vizact.onkeydown ('r', oriTracker.reset)
data=headlink.getData()
print data

[Jeff]

How many markers are being streamed from PPT? What is the marker number for the wand?

[piyush]

two markers... numbered 0 and 1

[Jeff]

It looks like your code is just getting a handle to VRPN sensor 0, which corresponds to marker 1 in PPT Studio.

If you add the following code to your script do you see the axis model move with the wand:

import vizshape
axis =vizshape.addAxes(length=0.1)
wandTracker = vrpn.addTracker('PPT0@WORLDVIZ-PC',1)
viz.link(wandTracker,axis)

[piyush]

No..it still doesnt work.
Why dont we first try for only one tracker.
Assist the required changes for only one tracker as a start, rest can b added in similar way

[Jeff]

Are you getting data from PPT?

import viz
import vizact

viz.go()

vrpn = viz.add('vrpn7.dle')
posTracker = vrpn.addTracker('PPT0@WORLDVIZ-PC',0)

def showData():
	print posTracker.getPosition()
	
vizact.ontimer(1,showData)

[piyush]

Response after working previous code
(46) from PPTO : no response from server for 10 sec
[0.0,0.0,0.0]
Vrpn error
Vrpn_endpoint :send error reports() no TCP connection

[Jeff]

Make sure the machines can ping each other. If that is successful, disable any firewall or virus scanner. That could block the communication.

[piyush]

Ping test already done...n all firewall and virus scanners are disabled

[Jeff]

Make sure the VRPN7 output plugin is loaded and Talk is enabled in PPT Studio. If that's set up correctly please contact support@worldviz.com and we'll help troubleshoot further.