I've been looking for an answer to whether ARKit, specifically ARSCNView, shows the same screen/view/scene size on all devices. I only have an iPhone XS so I am unable to test my ARKit app on other devices.
Currently I am overlaying it with an SKScene from SpriteKit, and in SpriteKit there are 2 different sizes all devices run on.
Through print statements I've been able to find that with the front-facing camera, thus presenting my face on-screen, and overlaying it with an SKScene, that the size of the screen/view/scene/etcetc is 375x812.
Does anyone happen to know if all devices present the same size with ARKit + SpriteKit overlay?
Of course different iPhone models present different resolutions. There's a big difference between iPhone's screen size and viewport size. Look at this table. In some cases viewport size is 1/9 of screen size, sometimes – 1/4. Though, some models have identical screen size and viewport size.
| Device | Screen Size | Viewport Size |
|---|---|---|
| iPhone 12 Pro Max | 1284 x 2778 | 428 x 926 |
| iPhone X | 1125 x 2436 | 375 x 812 |
| iPhone SE 2 | 750 x 1334 | 375 x 667 |
| iPhone 8 Plus | 1080 x 1920 | 414 x 736 |
| iPhone 6s | 750 x 1334 | 375 x 667 |
For more details, you can read this SO post.
This guide gives you a visual representation.