Problem viztracker values

[befl0]

Hi,

I used a tracker with a vrpn. Sometimes when I do a tracker.getData() and I put it in 8 values, a mistake appears because there are " too many values to unpack" but sometimes it's working perfectly. I realy don't understand why and where I can fixed the problem. I think it's a problem of connection but I am not sure. If you can help me how to find the solution.

Thanks,

[Jeff]

Can you post the code you're using to access the VRPN tracker and save the data to the 8 values? Also, can you post the Vizard output and error messages?

[befl0]

The code to access to the vrpn tracker is :

def bigAndSmall():
	while True:
		yield viztask.waitTime(0.0001)
		x, z, y, h, p, r, ang_der, ang_izq = tracker.getData()

And the error is : File "viztracker.py", line 56, in bigAndSmall
x, z, y, h, p, r, ang_der, ang_izq = tracker.getData()
ValueError: too many values to unpack
check_vrpn_cookie(): VRPN Note: minor version number doesn't match: (prefer 'vrpn: ver. 07.31', got 'vrpn: ver. 07.30 0'). This is not normally a problem.

Thanks,

[Jeff]

That error means there are more than 8 values being returned. You could save the values to a list and then extract the first 8.

data = tracker.getData()
x = data[0]

[befl0]

Hello,

Thanks for this answer, of course this is the solution.

It's working perfectly

Bérengère