You know how we don't see our guardian face often? What do y'all think about see-through visors for some helmets? Might be a fun ornament.
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I'd say too much renderring for memory during an active event... But knowing Bungie's lack of planning abilities (like vault space) - they probably do the 3D renderring/mapping under the helmet even when you can't see it. I have absolutely no evidence that siggests otherwise.