# ----------------------------------------------------------------------------

# - Open3D: www.open3d.org -

# ----------------------------------------------------------------------------

# The MIT License (MIT)

#

# Copyright (c) 2018-2021 www.open3d.org

#

# Permission is hereby granted, free of charge, to any person obtaining a copy

# of this software and associated documentation files (the "Software"), to deal

# in the Software without restriction, including without limitation the rights

# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

# copies of the Software, and to permit persons to whom the Software is

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# The above copyright notice and this permission notice shall be included in

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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

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from os import listdir

from os.path import isfile, join, dirname, abspath, exists

import urllib.request

import tempfile

import shutil

def ensure_demo_data():

"""Check if demo data is present. Else download from github."""

# Very basic check for demo data. Delete the folder and re-run if data is

# corrupted.

DEMO_DATA_DIR = join(dirname(abspath(__file__)), "demo_data")

DEMO_DATA_URL = "https://github.com/isl-org/open3d_downloads/releases/download/open3d-ml/open3dml_demo_data.zip"

if exists(DEMO_DATA_DIR) and {'KITTI', 'SemanticKITTI'}.issubset(

listdir(DEMO_DATA_DIR)):

return DEMO_DATA_DIR

print(f"Demo data not found in {DEMO_DATA_DIR}. Downloading...")

with tempfile.TemporaryDirectory() as dl_dir:

dl_filename = join(dl_dir, "demo_data.zip")

with urllib.request.urlopen(DEMO_DATA_URL) as response, open(

dl_filename, 'wb') as dl_file:

shutil.copyfileobj(response, dl_file)

shutil.unpack_archive(dl_filename, DEMO_DATA_DIR)

return DEMO_DATA_DIR