*Disclaimer: I am not the original programmer for this, finding the SDK is an absolute pain, I don't get responses from Tobii when I send requests. found a 4.23 version and updated for 4.27, *

https://github.com/litruv/TobiiEyetracking/blob/4.27/Source/TobiiCore/Public/TobiiTypes.h#L215 for the one change I did make.

Tobii Unreal Engine SDK requires the following setup on your computer:

• Unreal Engine 4.27 or later
• Windows 10, 8.1, or 7
• Target build platform Windows32/64
• Tobii Eye Tracking Core Software (either downloaded install bundle for peripheral eye tracker, or pre-installed on integrated systems)
• Tobii consumer eye tracker peripheral or built-in device.

Unzip this package into the Plugins folder in your project. The uplugin file should be located here:

MyProject/Plugins/TobiiEyetracking/TobiiEyetracking.uplugin

Launch your project again and follow the prompts from there to get to the samples and try out some eyetracked interactions!

If you are developing for desktop, a good place to start is the Tobii Unreal Engine SDK section on for desktop [Tobii Developer Zone] (https://developer.tobii.com/pc-gaming/unreal-engine-sdk/api-reference/).

If you are focusing on VR have a look at the VR section of [Tobii Developer Zone] (https://developer.tobii.com/vr/develop/ue4/api/introduction/).

Have Fun!