Credits and Licences
Last updated: 21 October 2026
Smashphone is built on work that other people chose to share. This page names it: the motion capture behind the players’ strokes, the player character, the table tennis park, and the software inside the app. It covers Smashphone 1.5.0 for iPhone and Apple Watch.
Where a licence asks for its copyright notice or its full text to travel with the work, you will find it under Licence texts.
1. Player Motion
Tennis-MoCap: “A tennis action dataset: competitive performance of Caldas-Colombia tennis players”, github.com/jdpulgarin/Tennis-MoCap. Maintainer: Juan Diego Pulgarin-Giraldo (Universidad Autónoma de Occidente, Colombia). Contributors: Sergio Garcia-Vega, Luis Gerardo Melo-Betancourt, Santiago Ramos-Bermudez, Andres Marino Alvarez-Meza and German Castellanos. Licensed under Creative Commons Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0).
Reference: Pulgarin-Giraldo J.D., Alvarez-Meza A.M., Melo-Betancourt L.G., Ramos-Bermudez S., Castellanos-Dominguez G. (2017). A Similarity Indicator for Differentiating Kinematic Performance Between Qualified Tennis Players. Progress in Pattern Recognition, Image Analysis, Computer Vision, and Applications, 309–317. doi:10.1007/978-3-319-52277-7_38
Smashphone uses 108 strokes from Tennis-MoCap across all four racket sports. What we changed: each clip is one stroke cut from a recorded take, retargeted from the dataset’s skeleton onto our player, with the moment the racket meets the ball marked. In the game the clips are blended and adjusted live, for example to reach the ball.
The adapted clips are shared under the same licence. The 108 motion clips Smashphone derives from Tennis-MoCap are licensed under CC BY-SA 3.0. Download them as a ZIP of JSON files with a README naming the source and the changes; every file also states its own source take and licence. This licence covers those clips, not the rest of the app.
MultiSenseBadminton: Seong M., Kim G., Yeo D., Kang Y., Yang H., DelPreto J., Matusik W., Rus D., Kim S. (2024). MultiSenseBadminton: Wearable Sensor–Based Biomechanical Dataset for Evaluation of Badminton Performance. Scientific Data, 11. doi:10.1038/s41597-024-03144-z. Dedicated to the public domain under CC0 1.0. Smashphone uses 18 strokes from it, mostly in badminton. CC0 asks for no credit; we give it gladly.
2. Player Character
Microsoft Rocketbox Avatar Library, github.com/microsoft/Microsoft-Rocketbox, MIT License, Copyright (c) 2020 Microsoft. The players are the Sports_Male_04 character, with the head and skin tone taken from Male_Adult_10. We added forearm twist bones, closed the hands round the grip and recolour the vest for each side.
3. Table Tennis Park
Everything in the park is CC0, which asks for no credit. We credit it anyway:
| Work | Author and source | Used for |
|---|---|---|
| Sunny Vondelpark (HDRI) | Greg Zaal, Poly Haven, CC0 | The sky’s light |
| Grass004, PavingStones099, Concrete025, Bark012, LeafSet024 | ambientCG, CC0 | Lawn, paving, terrazzo, tree bark, leaves |
| Morning park ambience (563547) | ValentinPetiteau, freesound, CC0 | Birdsong and a light wind |
The trees were grown with ez-tree by Daniel Greenheck (MIT License). Only the geometry it generated ships in the app, not the tool itself.
4. Software in the App
| Component | What it does in Smashphone | Licence |
|---|---|---|
| three.js, with its GLTFLoader, HDRLoader and SkeletonUtils | Draws the 3D court and the players | MIT |
| FlyingFox | The small web server on your phone that the big screen connects to | MIT |
| PostHog iOS | Product analytics, described in our Privacy Policy | MIT |
| PLCrashReporter, inside PostHog iOS | Crash reports | MIT; its protobuf-c parts Apache 2.0 |
| libwebp, inside PostHog iOS | Image encoding | BSD 3-Clause |
5. Licence Texts
Creative Commons. Tennis-MoCap and the clips adapted from it: CC BY-SA 3.0 Unported, legal code. MultiSenseBadminton, Poly Haven, ambientCG and freesound 563547: CC0 1.0 Universal, legal code.
MIT License, for each of:
- Microsoft Rocketbox Avatar Library: Copyright (c) 2020 Microsoft
- three.js: Copyright © 2010-2026 three.js authors
- FlyingFox: Copyright (c) 2022 Simon Whitty
- PostHog iOS: Copyright (c) [2023] [PostHog]
- the code from getsentry/sentry-cocoa inside PostHog iOS: Copyright (c) 2015 Sentry
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 furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
PLCrashReporter (inside PostHog iOS). Except as noted below, PLCrashReporter is provided under the following license:
Copyright (c) Microsoft Corporation. Copyright (c) 2008 - 2014 Plausible Labs Cooperative, Inc. All rights reserved.
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 furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Additional contributions have been made under the same license terms as above, with copyright held by their respective authors:
- Damian Morris <damian@moso.com.au> Copyright (c) 2010 MOSO Corporation, Pty Ltd. All rights reserved.
- HockeyApp/Bitstadium Copyright (c) 2012 HockeyApp, Bit Stadium GmbH. All rights reserved.
The protobuf-c library, as well as the PLCrashLogWriterEncoding.c file are licensed as follows: Copyright 2008, Dave Benson. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
libwebp (inside PostHog iOS). Copyright (c) 2010, Google 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 Google 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.