new_contents: from lightning import Lightning
  from numpy import ndarray, linspace
  
  lgn = Lightning()
  
  nx, ny, nz = (50, 50, 50)
  rgb = ndarray((nx,ny,nz,3))
  hsv = ndarray((nx,ny,nz,3))
  for i, ii in enumerate(linspace(0,1,nx)):
      for j, jj in enumerate(linspace(0,1,ny)):
          for k, kk in enumerate(linspace(0,1,nz)):
              position = (i, j, k)
              rgb[position] = (kk, jj, ii)
              
  lgn.volume([x for x in rgb])
subject: Add example