RealityKit

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RealityKit is a framework from Apple for creating 3D augmented reality apps running on iOS devices.

It is based on an entity hierarchy. RealityKit runs within an ARKit context.

RealityKit and SceneKit can run at the same time within an app, if it is programmed that way.

RealityKit supports loading ModelEntity objects, which can be created from USDZ files.

Physics can be toggled by the programmer, including gravity.

RealityKit is supported on iOS 13.