The visual meshes in meshes/ are converted from

    https://bitbucket.org/DataspeedInc/velodyne_simulator
    commit 03e3ce2e1a92991c31463f8935a98aa344f17da2
    file   velodyne_description/meshes/VLP16_base_1.stl
    file   velodyne_description/meshes/VLP16_base_2.stl
    file   velodyne_description/meshes/VLP16_scan.stl

Copyright (c) 2015-2021, Dataspeed Inc.
Licence: BSD-3-Clause, full text below.
Converted (and, where the source is heavy, decimated) to OBJ in metres by
external/convert/build_scanner_devices.py; the MJCF's link frame, visual origin, collision
primitive and inertial are read from the same repository.

--------------------------------------------------------------------------------

Software License Agreement (BSD License)

Copyright (c) 2015-2021, Dataspeed Inc.
All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.
    * Neither the name of Dataspeed Inc. nor the names of its
      contributors may be used to endorse or promote products derived from this
      software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.