[yt-dev] VR refactor status update

[Matthew Turk]

Hi all,

Andrew, Kacper, Allyson and I had a hangout to go over the current
state of the VR refactor that Sam started.

Where we're at:

 * Docs need to be written and updated.  I have committed to taking
this on, and I am starting today.
 * There are two cameras that need to be ported, the setreo spherical
camera and the perspective camera.  Suoqing, is there any chance you
might be able to take a look at doing this, and issuing a PR to Sam's
repository?  I ask only because you've been so good at camera porting
in the past.  :)

Once that's done, since there is a backwards-compatible camera
interface, I assert that we should consider heavily simply pulling in
the code and beginning to migrate.

-Matt