[Tutorial] Getting Started With ARKit in Unreal Engine 4.17

[anonymous_user_7153e85d]

@anonymous_user_b20ed723

Perhaps the stretching has something to do with this GitHub commit? https://github.com/EpicGames/UnrealEngine/commit/42ffe8c364b0bfd8b5834cc0bd5fda24ca111236

As far I can tell this has no effect to set r.MobileContentScaleFactor=1.5

I also tried now the ARKitDemo on an iPhone 6S and it works there perfectly. I feel it has something to do with the screen ratio or something similar, but I couldn’t figure out how to fix this.