Takase

参考 
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空のGameObjectにOVREyeGazeを追加してTrackingModeをWorldSpaceにする 
<img src="https://storage.googleapis.com/zenn-user-upload/ca20f4254397-20241219.png" loading="lazy" class="md-img">

Eye Tracking SupportをRequiredにする 
Permission Requests On StartupでEyeTrackingにチェック 
<img src="https://storage.googleapis.com/zenn-user-upload/cba71635dfaf-20241219.png" loading="lazy" class="md-img"> 
<img src="https://storage.googleapis.com/zenn-user-upload/a1ff3ffdecc0-20241219.png" loading="lazy" class="md-img">

OVREyeGazeが付いているGameObject自体が視線によって回転するので、そのTransformを利用する