Unity developers, on the other hand, can now install the Cardboard SDK and create their own VR project from scratch or adapt existing 3D apps for VR.

The main updates include new SDKs for developers building experiences on Android and Unity and a dedicated section for virtual reality Cardboard apps in the Google Play store.

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

The Android Game SDK is a new set of libraries for Android game developers intended to streamline development. This post explains how to use it.