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Old 01-30-2015, 08:18 AM
vserchi vserchi is offline
Join Date: Sep 2013
Posts: 7
Connecting Vizard and NDI Optotrak

I am trying to connect Vizard with Optotrak (Vizard 4.0 Enterprise). I have tried both through a Ethernet connection both through serial port. I have failed in both the cases and probably there is something I donít get about it.

Ethernet connection:

My code:

import viz
opto = viz.add('optotrak.dle',0,'')  # sensor adding 
body = opto.getBody(0)                                                 # first rigid body adding, viz.MainView)
** ERROR: Failed to connect to Optotrak server at
** ERROR: Failed to create extension: optotrak.dle
Traceback (most recent call last):
File "<string>", line 11, in <module>
File "F:\VRproject\", line 6, in <module>
body = opto.getBody(0) #first rigid body adding
** Load Time: 21.53 seconds
AttributeError: 'VizExtension' object has no attribute 'getBody'

Probably I am setting wrong the port number or the IP address (or both). I have looked for the IP address of the connection through the cmd -> ipconfig -> netstat Ėa.
Q1. Any suggestion on what I may try to make it working?
Q2. What does the Ď0í in opto = viz.add('optotrak.dle',0,'') mean? Should I change it?

Serial connection: (serial to USB port in the computer running Vizard)

I tried to run a couple of examples I found in the forum.

My code:

First attempt:
import serial 
import viz
ser = serial.Serial(2, 4800, timeout=1)     #ser = serial.Serial('COM3'); 
while True:
                x = 
                print x
Second attempt:
import serial 
import viz
while True:
                buffer = buffer +
                if '\n' in buffer:
                                lines = buffer.split('\n')  # Splits buffer block into lines
                                last_received = lines[-2]
                                buffer = lines[-1]
                                print last_received
I donít get any error in this case but I didnít get anything print as output. In the first case as output I got blank lines. In the second case it never passes through the if control.
Q3. I donít know if I donít receive anything or if didnít understand how is the form of the output from the serial port. Any idea? Where can I read more about that? Do you have any example on how to connect Vizard and Optotrack through the serial port?

I have two different serial ports on the Optotrack unit. One seems to be for data and one for timing stuff. I have tried to make the connection with both but anything changed.
Q4. Do you know which one have I to use?

I really appreciate any help you may give me.
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connection, ethernet, ndi, optotrak, serial

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