Long before Google introduced Daydream and subsequently left it dead in the water, the company created the Cardboard platform. You can use the carton headsets as an ultra-low-budget entry to VR to this day, and they're compatible with almost any regularly shaped phone on the market. Google has now open-sourced the underlying VR SDK which will allow interested developers to create their own VR experiences on Cardboard viewers and improve and enhance the project as they see fit.
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