LeapMotionP5
A programming language and development environment in one, Processing is designed to create visually stunning artistic experiences. The LeapMotionP5 library by Neurogami is design to provide different ways to manage events (callbacks, polling, etc.) so you can pick an approach that best suits your needs.
LeapMotionP5 is released under the MIT License. If you're looking for an alternative, check out nok's Processing library.
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Installer, SDK & Release Notes
JavaScript
Unity / C#
Unreal Engine 4
VR Getting Started
C++