title: Three.js - draw circle on a sphere
body: <p>I am very new to Three.js and I am just practicing with geometries.<br>
  Now I want to plot polygonal lines in 3D geometry.
  Suppose I have the 3D coordinates of a polygonal line, already stored as an array of THREE.Vector3 objects and all points being located inside the unit cube (1,1,1).<br>
  How to draw the polygonal line from such array, in 3D and using Three.js ?<br>
  (I didn't find anywhere one such tutorial and I think that a response with a sketch of code would be very helpful to many)</p>