can't even run through the sample code...

[yawning-lion]

thanks a lot for the great library!
I try to run sample code in terminal of ubuntu, but I just can't get proper result.

'''
from mesh_to_sdf import mesh_to_voxels

import trimesh
import skimage

mesh = trimesh.load('chair.obj')

voxels = mesh_to_voxels(mesh, 64, pad=True)

vertices, faces, normals, _ = skimage.measure.marching_cubes(voxels, level=0)
mesh = trimesh.Trimesh(vertices=vertices, faces=faces, vertex_normals=normals)
mesh.show()
'''

'''
from mesh_to_sdf import sample_sdf_near_surface

import trimesh
import pyrender
import numpy as np

mesh = trimesh.load('chair.obj')

points, sdf = sample_sdf_near_surface(mesh, number_of_points=250000)

colors = np.zeros(points.shape)
colors[sdf < 0, 2] = 1
colors[sdf > 0, 0] = 1
cloud = pyrender.Mesh.from_points(points, colors=colors)
scene = pyrender.Scene()
scene.add(cloud)
viewer = pyrender.Viewer(scene, use_raymond_lighting=True, point_size=2)
'''
I'm totally a noob there, and I'm wondering what's wrong with it.
someone can help？
I'll greatly apprieciate your help😭