I am working on an application where we are planning to use Metal for directly rendering custom content. When user looks at something on the rendered image, I want to get the position or ray of cursor (the point where the user is currently looking at) to render something else like a crosshair. Is it possible to get the cursor position information on VisionOS to accomplish this? How can I know if something is being hovered on by the eyes?
Cursor data on VisionOS
I'm afraid eye tracking information isn't currently available at all, regardless of the immersion level of your app. When creating an app in the mixed space, Apple handles eye tracking for you (but it's abstracted away), but when creating a fully immersive app you get nothing. So you'll need to come up with an alternative mechanism of input, for example using a game controller to manipulate an onscreen cursor.
It's a shame, and is the biggest limitation of the system right now IMO.