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Google Cardboard Profiles

The simple method of adding Google Cardboard support to a Vuforia Unity project appears to hardcode the viewer parameters (IPD, distortion coefficients, etc...), which means the app will only work well with one type of viewer.

Why don't you read in /sdcard/Cardboard/current_device_params that the Google Cardboard app writes out?

More details here: https://vr.google.com/cardboard/viewerprofilegenerator/