'How to get the screen central position in arkit?

I set a beat sight in the middle of the screen, and when I tap the screen and fire a bullet, on the ipad the beat sight and bullet are in the same position as expected, but on iphone (11) the bullet position is above the beat sight.

on ipad on iphone

The beat sight config is below

And the bullet position is below

   guard let pointOfView = sceneView.pointOfView else {return}
        let transform = pointOfView.transform
        let orientation = SCNVector3(-transform.m31, -transform.m32, -transform.m33)
        let location = SCNVector3(transform.m41, transform.m42, transform.m43)
        let position = orientation + location

Does anyone know how to solve it? Thanks a lot.

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'How to get the screen central position in arkit?

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