Arrington Plugin

[Uttama_vizard]

Hello Farshizzo,

The Viewpoint version I am running is ViewPoint(2.8.4 beta L4 437B). The Viewpoint.exe is in the Viewpoint Folder. It is running fine.

The vpx.dll folder which I have downloaded from the Worldviz Downloads section is in Vizard\bin\dll folder.

I have also tried loading the vpx.dll in the ViewPoint folder. It did not work.
Again, I loaded the vpx.dll in the folder where I my vizard program .py is. Still it gives the same error.

Thanks in advance for your time. I am not being able to solve this...your suggestions would be really valuable.

Thanks

Uttama

[Uttama_vizard]

Hello Farshizzo,

Your suggestions are always great!! Yes, now I have copied my .py file and the vpx.dll into the ViewPoint folder and now the error does not appear again.

But, it seems, I am getting the x and y coordinates and that too of one eye. I want to access those for the other eye (as I am using a binocular system) and also the ROI and other parameters.

point = vpx.getSmoothedGazePoint()

gives x,y coordinates and that too for one eye.

If you can suggest me some ways to access the other data as well.

Thanks

Uttama

[Uttama_vizard]

Hello,

I am finding no commands explicitly mentioned for Arrington Tracker in the Help menu.

From the downloads page, I got only,

import vpx
point = vpx.getSmoothedGazePoint()

The Help file alongwith Vizard package also does not show these.

Thanks

Uttama

[farshizzo]

The vpx plugin only supports getting the gaze point of one eye. You could use the ctypes module to manually access the function of the Arrington Viewpoint API. What specific functions do you need, other than getting the gaze point of both eyes?

[Uttama_vizard]

Hello,

At present, I want to access the Pupil Width (APW and BPW), Quality of eye movement data (AQU and BQU), Fixation Duration (AFX and BFX) and the x,y gaze direction coordinates (ALX, ALY and BLX, BLY) for both the eyes.

Thanks for your patient help.

Uttama

[Uttama_vizard]

Hello,

Actually, I would be carrying out some psychological experiments using the Arrington eye tracker. So, Pupil Width (APW and BPW), Quality of eye movement data (AQU and BQU)-if possible, Fixation Duration (AFX and BFX) and the x,y gaze direction coordinates (ALX, ALY and BLX, BLY) for both the eyes would be required.

I was looking for the ctypes in the Vizard help menu. I could not find sustantial amount of information regarding ctypes. So, any help in using ctypes would be really appreciated.

Thanks in advance for valuable suggestions.

Uttama

[farshizzo]

ctypes is 3rd party plugin for Python. You can find a tutorial for the plugin here:
http://python.net/crew/theller/ctypes/tutorial.html