SRanipal eye tracking C++ API does not reach 120 Hz sampling frequency(1.3.2.0 runtime and 1.3.3 SDK, win10 pro, i7-10700k, 3060ti)

[paul_hhhh]

Hi everyone,

I can only get data of about 60Hz using c++ eye tracking API. I just used the callback of the C++ sample project and modified main.cpp.

The attached are the modified script  and one of data collected  by us.

Here are  software and hardware relevant details:

• 1.3.2.0 runtime and 1.3.3 SDK
•  win10 pro, CPU: i7-10700k, GPU: 3060ti

Looking forward to your reply, thanks!

 

Sub_testv_Time_1_2021_9_14_18_16.csv

[paul_hhhh]

And another question, I want to collect the eye movement data of the participants while playing the VR game, which means that the eye data collection program needs to be run separately. Is C++ api the only way?

Sorry to disturb you, do you have any comments, @Corvus?

[paul_hhhh]

It’s because I added this to get the system time and cause the problem:

error = ViveSR::anipal::Eye::SRanipal_GetSystemTime(&system_t);

 

Use the callback of C++ sample project provided by Vive can obtain 120Hz data... 

 

[Bipul]

Hi @paul_hhhh, see nobody answered your query, and congratulation, you have solved your problem. I believe your solution would also be helpful for me. May I ask you a question, I have an HTC Pro Eye HMD, and trying to use the eye tracing feature in my C++ project. I know SRanipal works for both Unity3D and Unreal Engine, but I want to have eye-tracking in my C++ code. Is there any documentation/ tutorial how I can do that? 

[paul_hhhh]

Hi @Bipul, you can download VIVE Eye and Facial Tracking SDK from this link(Latest (1.3.3.0) - Developer Resources (vive.com)), which contains the C++ sample code and documentation. 

[Bipul]

Thank you so much for your instant reply. I am using NVIDIA OptiX ray-tracing framework, if eye tracking could work with that, it would be amazing.