new_contents: ''' Generate image and ground truth from the scene, for development purpose '''
  
  from unrealcv import client
  import numpy as np
  import matplotlib.pyplot as plt
  
  def read_png(res):
      import StringIO, PIL.Image
      img = PIL.Image.open(StringIO.StringIO(res))
      return np.asarray(img)
  
  def read_npy(res):
      import StringIO
      return np.load(StringIO.StringIO(res))
  
  def request(cmd):
      res = client.request(cmd)
      if res.startswith('error'):
          print(res)
      return res
  
  if __name__ == '__main__':
      client.connect()
      print('Client is connected')
  
      # Save lit png
      res = request('vget /camera/0/lit png')
      lit_png = read_png(res)
      print(lit_png.shape)
      plt.imsave('lit.png', lit_png)
  
      res = request('vget /camera/0/normal png')
      normal_png = read_png(res)
      print(normal_png.shape)
      plt.imsave('normal.png', normal_png)
  
      res = request('vget /camera/0/depth npy')
      depth_npy = read_npy(res)
      print(depth_npy.shape)
      np.save('depth.npy', depth_npy)
  
      res = request('vget /camera/0/normal npy')
      normal_npy = read_npy(res)
      print(normal_npy.shape)
      np.save('normal.npy', normal_npy)
  
subject: Add a script to generate data for helping development.