title: iOS - rotating a sphere and responding to touch
body: <p>I've been tasked with creating a sphere that can be rotated by touch (or animated) along one axis, like a regular globe. I should also be able to draw animated lines on this sphere (eg. draw a line between Sydney and New York). I usually do all my animations in 2D, typically using core animation as I've never really had a need to do anything else. I have a feeling that this sort of problem though requires me to jump into OpenGL.</p>
  
  <p>My question is whether it would be possible to achieve this using core animation (time is of the essence), or if I do need to quickly learn OpenGL. If so, is this a fairly simple problem to solve? I'm a pretty good programmer, but I have no OpenGL experience. Would a capable programmer be able to do this in say 2 weeks?</p>
  
  <p>As a further question, supposing I do use OpenGL, if I then need to do other things in the project (eg. show different screens, or show screens over the top of the sphere), am I able to use UIKit or does the entire project need to be in OpenGL?</p>