FPS drop when adding child to a scene ARKit/SceneKit

Question

I\'m working on an ARKit project for 4 months now. I noticed that when adding a child to my scene rootNode, there is a FPS drop. The device freezes for less than a second. I di

Answer 1

With the release of ARKit 3.0 and its satellite – RealityKit (framework with optimised rendering engine and changed scene's hierarchy, that was written in Swift hence it has no Objective-C binding), a drop-frame, when adding a child, is reduced to an imperceptible value.

And such a predictable behaviour of ARKit3/RealityKit ligament is especially true for devices with processors A12 Bionic and A13 Bionic manufactured on 7 nm process (and, of course, due to the fact they have last-gen neural engines and powerful GPUs).

For devices with a less powerful processors (A9, A10, A11), it is advisable to use 3D models with a total number of polygons of no more than 10K per model, and with usual shaders like .blinn or .phong (not PBR).

I believe it's quite a common practice for games and apps that use game engines, to firstly load (or cache) all the necessary game assets (like 3D models, textures, sound files, etc) into RAM before using them. For further details please read this article and this article.

However, it’s worth saying that AR games, unlike VR games, consume considerably more processing power, therefore they need to be carefully optimised. So, you're absolutely right, rendering nodes before using them and it's a normal behaviour in game programming.