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I'm working on a small project in Blender3D. It's supposed to be viewed in the Google Cardboard VR glasses.

Using the 'Views' and the 'Stereoscopy' functions I was able to achieve the result you see here in the pic. I can't figure out the barrel (lens) distortion though. Mainly, how much barrel distortion am I supposed to go for? How should I apply the distortion?

Also, since I've already rendered out the whole video without the distortion, I'm thinking of adding it in post in AfterEffects. Again, any idea about how much lens distortion would work optimally?