Question CameraRays in VR (Basic Question)

I was looking at the Unity documentation page for Camera Rays https://docs.unity3d.com/Manual/CameraRays.html and I had a question regarding the line:

Ray ray = camera.ScreenPointToRay(Input.mousePosition);

If I'm looking to just have a simple raycast centered to the camera to select items on a menu screen for example, what should "mousePosition" be replaced with since I won't be using a mouse in VR? Or will it work normally to leave that specifier in?

Thanks!

 

No, you'll have to use something else. If you really want a ray through the center of the screen (which you shouldn't want; you should instead cast a ray from one or both hands), you would use Camera.ViewportPointToRay.

 

Unless you're doing gaze-selection? In that case I guess you'd use this ... although I'd be tempted to still try and do a raycast from the in-world controller / XRNode object, so that I could re-use the same code on my "head" controller and "hands" controllers.

i.e. Physics.Raycast( node.transform.position, node.transform.forward, ... ) or something like that.