As Unity 3D is (mostly) not open source, Google must be working directly with the developers of Unity on the Android Game SDK.

How to create Gear VR apps using Unity3D or Android Studio with the Mobile SDK. It's easier than you think to create virtual worlds!

Unity’s service is one used by many in the industry, from developers big to small. Of the biggest games, data.ai has identified 71% use at least one Unity SDK.

A new cross-platform toolkit for game development engine Unity3D launched today, Facebook announced at Unity 2013, allowing developers to easily integrate Facebook features into their Unity games.