⚠️ Eye Tracking with SRanipal will only work on Windows right now and only with a Vive Pro Eye (and was only tested with UE 4.27) ⚠️ Just head orientation tracking will always work!

Prerequisite for using SRanipal

• You have to add the SRanipal plugin to your project it can be downloaded as part of the SDK here (HTC Vive account required)
  ⚠️ Make sure that the Plugins/SRanipal/Binaries folder is commited to your project. In case it is ignored by default do git add -f Plugins/SRanipal/Binaries

• Furthermore Vive SRAnipal needs to be installed. Currently this can be done via Steam installing Vive Console. I had problems starting calibration, since the firmware seemed not to be updated, starting Tobii Pro Lab automatically started a firmware update.

• Also in your project you have to have the SRanpial plugin activated in the .uproject file

"Plugins": [
		{
			"Name": "SRanipal",
			"Enabled": true
		}
	],

Starting with SRanipal

For any HTC Vive Pro Eye eye tracking to work:

• Steam (VR) for me needed to be started as admin
• SR_Runtime needs to be started (as admin)
• For development potentially also Visual Studio starting Unreal need to be run as admin
• (or maybe just run entirely under the admin profile)

If this is not done, eye calibration is not started correctly.

Some more insights can be found at: Unreal Eye Tracking Demo Project