After killing its ambitious Daydream VR project last month, Google is making the Cardboard VR project open source. The company said the code repository includes features such as APIs for head tracking, lens distortion rendering, and input handling, for developers to build Android and iOS apps designed for Cardboard VR experiences. Google Cardboard was released five years ago at the company’s developer conference, Google IO. The search giant claims 15 million units of Cardboard VR –made using its Cardboard Manufacturer Kit – were used worldwide. Google said use of Cardboard VR declined over time and it’s no longer actively developing its Software Development Kit…

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