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- This topic has 4 replies, 2 voices, and was last updated 4 years ago by Grant [Tobii].
- 26/02/2019 at 12:43 #9503
I am now trying Eye Tracker 4C device with the Alpha version of Linux library (tobii_core_software_for_linux_0.1.6.zip), and seeing the following post:
>Please bear in mind you *will* need to calibrate otherwise the eye position data will not be reliable.
Using the library myself, I am seeing that gaze_origin and gaze_point data are not retured (0,0,0 are returned), and I think I may need to calibrate the device.
However, looking into the document accompanied to the library, I can see the following:
> All functions in the configuration API which modify state (i.e. eveything except get- and enumerate-functions) require a config level license, and a device created through tobii_device_create_ex.
So, I must figure out how to go further.
1) What is the “config level license”?
Looks like all the tobii_calibration_xxx APIs are in tobii_config.h and tobii_device_create_ex is in tobii_license.h.
So, it means if I were to call these API to calibrate my device, I may need this “config level license”.
Is it the same as “Pro” license or else?
May I have the details?
And is my understanding is true that my device will not return gaze data unless I calibrate it using these APIs (or below)?
2) What if I calibrate it with on another PC?
I tried device setup on Windows (using the tobii-povided Windows utility).
My device worked great on Windows – I could calibrate and play the game.
Then, I re-connected my device to my Linux box, but I am stiull not getting the gaze point, etc.
It means, when I pull the device from Windows PC, my calibration is gone (and need to calibrate again on Linux?)
Is there way that I can keep my calibration on Windows and continue using it on Linux (where I am currently evaluating my device)?
(Such operation should work, if the device keeps data even when it is pulled from Windows ?)01/03/2019 at 09:35 #9581
Well, concerning the calibration license on Linux (or whatever), described above, additionally I want to know:
– Is it per-device license?
– Or it is per developer (so that multiple device can be calibrated, by one software)04/03/2019 at 17:15 #9602Grant [Tobii]Keymaster
Hi @takashimatsuzawa, thanks for your patience whilst we tried to collate the various information in regard to your query.
With regard to the config licence. This is required for a couple of operations in SEC that changes the configuration of the tracker. This includes at least configuring the display setup and custom calibration of the tracker.
The Pro license level automatically includes “config”.
Certainly, gaze data will not be returned if no calibration file is found. Also, the Tobii 4C doesn’t keep the calibration through a power cycle. TobiiService doesn’t handle this either. For the 4C it is the Tobii tech software bundle that persists calibrations over power cycles. So it would not work to calibrate on Windows and then switch to Linux.
The config licence would be per-device although depending on the number you have in mind, it would be best to email [email protected] who can provide you an exact quote.
Please let us know if we can provide for you any further information.13/03/2019 at 03:31 #9951
Hello, thank you very much for the comment, and now I fully understand the situation.13/03/2019 at 20:28 #10066Grant [Tobii]Keymaster
Hi @takashimatsuzawa, Great! Please don’t hesitate to get in touch again if we can be of further help 🙂
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