import numpy as np
import pyevtk

np_data = np.load('/Users/fangdali/Code/DEBATR/results/wFBP/freect/bag_no_5'
                  '/whole_bag.npz')['arr_0']
print np_data.shape
w, h, l = np_data.shape
x = np.arange(0, w + 1)
y = np.arange(0, h + 1)
z = np.arange(0, l + 1)

pyevtk.hl.imageToVTK('/Users/fangdali/Code/DEBATR/results/wFBP/freect/bag_no_5'
                    '/whole_bag', cellData={'data': np_data})