2. Apple has bought at least four startups which specialized in related technologies:

Although Apple hasn't made a multi-billion dollar splash in a space, unlike Facebook, which did so when it bought Oculus for $2 billion, Apple still stands as a major buyer when it comes to VR startups.

Recent purchases include:

FaceShift, a company that can transform a user's face into a 3D digital cartoon in real-time.

Metaio, a German company that made an app that visualizes what digital furniture might look like in your home.

FlyBy Media, a company that had previously worked with both Google and Apple on computer vision, a technology closely linked to augmented and virtual reality.

Sophisticated computer vision technology is needed in order to situate digital objects in their surroundings in a way that convinces the user they're real.

PrimeSense, bought for $360 million in 2013, made camera and video sensor hardware specifically tuned for computer vision applications. And those are just the ones we know about.

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