title: Three.js TrackballControls.js rotating in z & x axis only
body: <p>I,m trying to set TracballControls in threejs to move only in two axles, only pan and tilt, without roll. Is there any possibilities to make it?
  My code: <a href="http://360.art.pl/experimental/2/" rel="nofollow">http://360.art.pl/experimental/2/</a>
  Mouse move should behave like this: <a href="http://360.art.pl/experimental/1/" rel="nofollow">http://360.art.pl/experimental/1/</a></p>