title: Can't import using * with
body: <p>I have the following code:</p>
  <pre><code>https://github.com/marcomusy/vedo/blob/master/examples/basic/colorlines.py
  
  &quot;&quot;&quot;Color lines by a scalar&quot;&quot;&quot;
  from vedo import *
  
  pts1 = [(sin(x/8), cos(x/8), x/5) for x in range(25)]
  l1 = Line(pts1).c('black')
  l2 = l1.clone().rotateZ(180).shift(1,0,0)
  
  dist = mag(l1.points()-l2.points())  # make up some scalar values
  
  # The trick here is to think that the &quot;body&quot; of a line is a cell
  # so we can color cells as we do for any other polygonal mesh:
  lines = Lines(l1, l2).lw(4).cmap('Accent', dist, on='cells')
  
  lines.addScalarBar(title='distance') # or e.g.:
  # lines.addScalarBar3D(title='distance').scalarbar.rotateX(90).pos(1,1,2)
  
  show(l1,l2, lines, __doc__, axes=1, bg2='lightblue', viewup='z')
  
  </code></pre>
  <p>However, this gives me the following error:</p>
  <pre><code>Traceback (most recent call last):
    File &quot;vedo.py&quot;, line 2, in &lt;module&gt;
      from vedo import *
    File &quot;/Users/prikshetsharma/Documents/clotorch/src/clotorch/flight/vedo.py&quot;, line 4, in &lt;module&gt;
      pts1 = [(sin(x/8), cos(x/8), x/5) for x in range(25)]
    File &quot;/Users/prikshetsharma/Documents/clotorch/src/clotorch/flight/vedo.py&quot;, line 4, in &lt;listcomp&gt;
      pts1 = [(sin(x/8), cos(x/8), x/5) for x in range(25)]
  NameError: name 'sin' is not defined
  
  </code></pre>
  <p>However, sin is imported from numpy in the <strong>init</strong>.py file of vedo, so it should be defined in this file.</p>