# Getting started with 6DoF controllers in the Android NDK

This guide shows you how to set up Google VR development with the Android NDK
and build the **HelloVRBeta** sample app. This app is designed to help you learn
about working with the see-through mode technology as well as the experimental
6DoF controllers and faceplate.

1. Download and install the latest version of `gvr-android-sdk\*.zip` from the [releases page](https://github.com/googlevr/gvr-android-sdk/releases).
2. Follow these steps to build and run the [HelloVRBeta sample app](https://github.com/googlevr/gvr-android-sdk/tree/master/samples/ndk-hellovrbeta).
   The requirements and steps to build the sample app using the NDK are nearly the same
   as [building the HelloVR sample app](https://developers.google.com/vr/android/get-started) for the SDK, with the following key changes:

   1. Download the latest version of the [Android NDK.](https://developer.android.com/ndk/downloads/index.html)
   2. Extract the NDK `.so` files by running:

            ./gradlew :extractNdk

   3. In `settings.gradle`, uncomment the following line:

            include ':samples:ndk-hellovrbeta'

   4. To build and run the sample app in Android Studio, select **samples-ndk-hellovrbeta** as your target.

If you're familiar with developing for Daydream, here are the changes you need
to make in order to support the 6DoF controllers and faceplate:

- To identify your app as supporting the 6DoF controllers and faceplate, add the
  following meta-data tag to
  your `AndroidManifest.xml` file within the `<activity>` element:

      <activity ...

        <meta-data android:name="com.google.vr.controllers.supportedConfigs" 
        android:value="3Dof|2x6Dof"/>

      </activty>

- Make sure your `gvr_controller_create_and_init()` call specifies
  `GVR_CONTROLLER_ENABLE_POSITION`; otherwise, the position data will be discarded.

## Using the controllers after setup

Fluorescent lighting and HTC Vive Lighthouses are both known to interfere with tracking. Turn off the Vive Lighthouse if you have one, or move to a room with different conditions.