What are some best practices for UI design in virtual reality? [closed]

First person perspective games typically feature a four-corner HUD-based approach for displaying peripheral info to the player i.e. health bar, mana, radar, etc.

This looks awful in VR. What the player sees is four floating 2D squares, which, not only look bad, but can also cause eye strain when looking between the world and an occluding HUD element. Especially when placed in the visual limit range (see diagram).

_{(source: mozvr.com)}

I've seen some creative solutions for hierarchical menus that involve hand motion-tracking (Leap Motion and Dexmo come to mind). Approaches like this opt out of a HUD altogether and anchor information to objects in the world. In the case of the Leap Motion/Dexmo the player's motion-tracked arm is the anchor for the menu.

I want to see what I can (and what others) get away with in displaying basic information that always remains within the player's visual field range.

So, instead of positioning planar HUD elements in the visual limit range maybe display them as close to the center around the reticle. For a health/mana meter: Make it radial, invisible when there is no change, and semitransparent when there is a change to display.

What do you think of this approach? Are there examples yet of design practices in VR that rethink HUD conventions without anchoring? Generally I think they'd be minimalist solutions like the one I outlined above.

And, to note, I understand that some things have to go. I've yet to see a good solution for radar (although I like what Bungie's done with traditional 'breadcumb' radar in their latest game, Destiny. This could be adapted to VR).