title: Can I render a 2D circle using mayavi?
body: <p>I'm using mayavi with python to show a collection of points, each of which has a 3D-coordinate, a color and a size.</p>
  
  <p>Now I can use <code>points3D</code> to show them as 3D spheres. And I'm wondering whether I can render them as 2D circles which <em>always facing</em> the camera.</p>