title: STEP file reading issue in Python
body: <p>I am using Python3.4.2 and pythonOCC-0.16.0-win32-py34.exe to draw components. Every components are rendered properly with one defined color but that is not look like a real world component.</p>
  
  <p><img src="https://i.stack.imgur.com/EkyJR.png" alt="enter image description here">
  Above image is my Python implementation which generate 3D image from STEP file with one color.</p>
  
  <p>Below image is rendered one of my windows software and there I have used Step file. I want to render component same as look like in below image so its look like a real world component.</p>
  
  <p><img src="https://i.stack.imgur.com/1YeLp.png" alt="enter image description here"></p>
  
  <p>Is there any way to get correct colored output in Python by read STEP file? I have searched a lot but didn't get a way to implement it. Please help me to go in forward direction.</p>
  
  <pre><code>from future import print_function
  import sys
  #from OCC.STEPCAFControl import STEPCAFControl_Reader
  from OCC.STEPControl import STEPControl_Reader
  from OCC.IFSelect import IFSelect_RetDone, IFSelect_ItemsByEntity
  from OCC.Display.SimpleGui import init_display
  from OCC.Display.WebGl import threejs_renderer
  
  step_reader = STEPControl_Reader()
  status = step_reader.ReadFile('./models/test.STEP')
  
  if status == IFSelect_RetDone: # check status
  failsonly = False
  step_reader.PrintCheckLoad(failsonly, IFSelect_ItemsByEntity)
  step_reader.PrintCheckTransfer(failsonly, IFSelect_ItemsByEntity)
  
  ok = step_reader.TransferRoot(1)
  _nbs = step_reader.NbShapes()
  aResShape = step_reader.Shape(1)
  else:
  print("Error: can't read file.")
  sys.exit(0)
  
  #display, start_display, add_menu, add_function_to_menu = init_display()
  #display.DisplayShape(aResShape, update=True)
  #start_display()
  
  my_renderer = threejs_renderer.ThreejsRenderer(background_color="#123345")
  my_renderer.DisplayShape(aResShape)
  </code></pre>
  
  <p>The above code is used for read STEP file using Python.</p>