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These extensions, or plugins, allow you to add special features to your unity projects without the hassle of writing them yourself from the ground up.

There are two kinds of plugin: those containing only .NET code and those which contain binary code.

.NET Plugins

.NET plugins are simply DLLs which have been built from Mono/.NET source code. When your project is built, they are merged with the compiled Mono code from your project's scripts. This means that you can use them with a Unity Indie licence as well as with Pro and in web players.

Cross-Platform Plugins

  • Antares.dll : a shareware part of the freeware Antares Project. Including Antares.Manager (Events message system), Antares.Async (asynchronous Asset Bundle loading and management classes) and some more helpers.
  • Path - Add pathfinding to your unity projects. Path implements the A* algorithm on NavMeshes, using multi-threading and several optimisation tricks to reduce calculation time.
  • Behave - Via an editor extension and a runtime library, this project implements behaviour trees in unity for AI decision making. It features an easy to use drag-and-drop design interface and compiles designed behaviour trees are compiled to .NET plugins with a simple, but versatile runtime interface.
  • UnitySteer - UnitySteer contains a series of classes that help your game characters or vehicles maneuver around a scene: how to accelerate and for how long, how to turn depending on vehicle characteristics, how to act when avoiding obstacles or neighbors, how to keep a distance from other agents, or many other cases. Some of these behaviors are quite simple, but they can easily be combined to generate more complex vehicles.

Windows Only Plugins

  • XInput.NET - Add complete support for Xbox 360 Controller, all buttons, axes, trigges, buttons and vibration. API very similar to Microsoft.Xna.Framework.Input. Tested with Unity Indie 2.6.0.(If you get a missing DLL Error, then you may need to download the source files from his website, and rebuild the DLL's > I fixed this in the updated archive on my website, thanks for the tip)

Native Code Plugins

Native code plugins can be written in many languages, including C and C++. A Unity Pro licence is required to use these plugins. This kind of plugin can only be used in the editor and in standalone builds. The web player is prevented from using them for security reasons.

The Unity documentation outlines how native code plugins are made here.

Cross-Platform Plugins

  • QTPlayback - Play any QuickTime movie to a texture with synchronized sound.
  • UniWii - Use Wiimotes as input devices.

Mac OS X Only Plugins

  • AudioInput - Use AudioInput.Volume to provide microphone or other audio input to your Unity projects.
  • HtmlTexturePlugin - Display an HTML page as a texture, for use on a mesh or in a GUI.
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