title: Three.js object with constant size
body: <p>I'm working on a drawing program and what I need is a THREE.Object3D element that would have a constant size - just like the line has always 1px.
  In other words, I'm trying to put to the stage an object which size would be always the same to the viewer (<strong>so if you got closer to it, it's size wouldn't change</strong>).
  Similar mechanism is with <strong>THREE.Line</strong> - it's always 1px wide. I need to create a <strong>circle</strong> (or maybe other shapes also).
  What's the best way to do that?</p>