There was a problem when I run visual_ 3d_ layout.py

When it comes to Warp floor and ceiling,After creating the thread, there is no result or error. What is the reason? Is it just waiting for a long time? Line 87 of visual_ 3d_ layout.py
```
    with Pool(n_thread) as p:
        sel = p.map(functools.partial(pt_in_poly, xy_poly), floor_xyz[:, :2])

    return floor_texture[sel], floor_xyz[sel], ceil_texture[sel], ceil_xyz[sel]
````