Google Cardboard Download For Android

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This guide shows you how to use the Cardboard SDK for Android to create your own Virtual Reality (VR) experiences.

You can use the Cardboard SDK to turn a smartphone into a VR platform. A smartphone can display 3D scenes with stereoscopic rendering, track and react to head movements, and interact with apps by detecting when the user presses the viewer button.

To get started, you'll use HelloCardboard, a demo game that demonstrates the core features of the Cardboard SDK. In the game, users look around a virtual world to find and collect objects. It shows you how to:

Set up your development environment
Download and build the demo app
Scan the QR code of a Cardboard viewer to save its parameters
Track the user’s head movements
Render stereoscopic images by setting the correct view projection matrix for each eye

HelloCardboard uses the Android NDK. Every native method is:

Bounded uniquely to a HelloCardboardApp class method, or
Creates or deletes an instance of that class

Set up your development environment

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Software requirements:

Android Studio version 3.4.1 or higher
Android SDK 9 'Pie' (API level 28) or higher
Latest version of the Android NDK framework
To review or update installed SDKs, go to Preferences > Appearance and Behavior > System Settings > Android SDK in Android Studio.

Download and build the demo app

HelloCardboard is built using a pre-built Protocol Buffers binary. Steps to build the binary from scratch can be found here.

Run the following command to clone the Cardboard SDK and the HelloCardboard demo app from GitHub:
In Android Studio, select Open an existing Android Studio Project, then select the directory wherethe Cardboard SDK and the HelloCardboard demo app were cloned into.
Your code will appear in the Project window in Android Studio.
To assemble the Cardboard SDK, double-click the assemble option in the Gradle tab.
Run the HelloCardboard demo app on your phone by selecting Run > Run.. and select the hellocardboard-android target.
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Scan the QR code

To save the device parameters, scan the QR code on the Cardboard viewer:

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If the user presses 'SKIP' and there are no previously saved parameters, Cardboard saves Google Cardboard v1 (launched at Google I/O 2014) parameters.

Try the demo

In HelloCardboard, you'll look for and collect geodesic spheres in 3D space.

To find and collect a sphere:

Move your head around in any direction until you see a floating shape.
Look directly at the sphere. This causes it to change colors.
Press the Cardboard viewer button to 'collect' the sphere.

Configure the device

When the user taps the gear icon to switch Cardboard viewers, the nativeSwitchViewer method is called. nativeSwitchViewer calls CardboardQrCode_scanQrCodeAndSaveDeviceParams, which opens the window to scan the viewer’s QR code. The viewer's lens distortion and other parameters are updated once the QR code is scanned.

Head tracking

Create head tracker

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The head tracker is created once in the constructor of HelloCardboardApp:

When VRActivity is created, an instance of the HelloCardboardApp class is generated by calling the nativeOnCreate method:

Pause and resume head tracker

To pause, resume, and destroy the head tracker, CardboardHeadTracker_pause(head_tracker_), CardboardHeadTracker_resume(head_tracker_), and CardboardHeadTracker_destroy(head_tracker_) must be called, respectively. In the 'HelloCardboard' app, we call them in nativeOnPause, nativeOnResume, and nativeOnDestroy:

Lens distortion

Every time Cardboard scans a new QR code, the following code reads the saved parameters and uses them to create the lens distortion object, which applies the proper lens distortion to the rendered content:

Rendering

Rendering content in Cardboard involves the following:

Creating textures
Getting view and projection matrices for the left and right eyes
Creating the renderer and setting the distortion mesh
Rendering each frame

Create textures

All content is drawn onto a texture, which is split into sections for the left and right eyes. These sections are initialized in _leftEyeTexture and _rightEyeTexture, respectively.

Note:

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The sample app uses a single texture for both eyes, but it is also possible to create a separate texture for each eye.

These textures are passed in as parameters to CardboardDistortionRenderer_renderEyeToDisplay.

Get view and projection matrices for left and right eye

First, retrieve eye matrices for the left and right eyes:

Next, get the distortion meshes for each of the eyes and pass it to the distortion renderer:

Create the renderer and set the correct distortion mesh

The renderer needs to be initialized only once. Once the renderer is created, set the new distortion mesh for the left and right eyes according to the mesh values returned from the CardboardLensDistortion_getDistortionMesh function.

Rendering the content

For each frame, retrieve the current head orientation from CardboardHeadTracker_getPose:

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Use the current head orientation with the view and projection matrices to compose a view projection matrix for each of the eyes and render content to the screen:

Use CardboardDistortionRenderer_renderEyeToDisplay to apply the distortion correction to the content, and render the content to the screen.

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