Google is open-sourcing its virtual reality viewer Google Cardboard. The open-source release of Google Cardboard includes source code, Android and iOS libraries, APIs, and a QR code library. Although usage for the product has significantly decreased since its introduction at Google I/O, and Google is no longer actively building the Google VR SDK, Google believes Google Cardboard provides a great deal of value to the budding VR industry as a low-cost entry point for developers to enter and experiment in the market.
Open source Google Cardboard allows developers to build immersive virtual reality experiences across platforms (iOS and Android). VR-based features include motion tracking, stereoscopic rendering, and user interaction via the viewer button. To get started, check out the Cardboard site.
Head tracking is captured through a series of APIs. Google will also continue to add features as new smartphone display configurations are made available. The various SDKs and NDKs for both Android and iOS are available at the Cardboard GitHub site.
Also available at the GitHub site are get started guides, reference documentation, release notes, contribution opportunities, and the open-source license. Although Google has open-sourced the project, usage remains subject to brand guidelines.