render `numpy` voxels in Blender

render.py

import bpy
import numpy as np

objs = bpy.data.objects
scn = bpy.context.scene

scene_objs = [
        objs['Cube_transparent'],
        objs['Cube_body']
  #      objs['sand'],
 #       objs['grass'],
#        objs['water'],
        ]

voxel_data = np.load('/home/u/p/cat_1st_demo/render_bendich/_cartesian_model.npy').astype('int')

for x in range(voxel_data.shape[0]):
    for y in range(voxel_data.shape[1]):
        for z in range(voxel_data.shape[2]):
            obj = scene_objs[voxel_data[x,y,z]].copy()
            scn.objects.link(obj)
            obj.location = (x*2.1, y*2.1, z*2.1)