title: Draw multiple lines with specific line color in Mayavi
body: <p>I followed <a href="http://docs.enthought.com/mayavi/mayavi/auto/example_plotting_many_lines.html" rel="nofollow">http://docs.enthought.com/mayavi/mayavi/auto/example_plotting_many_lines.html</a> to draw multiple point-to-point lines in 3D.
  It works, but i need to color each of the lines according to some scalar value.</p>
  
  <p>How can i assign such a scalar value on a line-per-line basis?</p>