RealityKit works with a polygonal mesh generated using Scene Reconstruction feature. Framework automatically generates and uses mipmaps, which are a series of progressively low-rez variants of objects' texture that improve render times when applied to distant objects. All scene models must be tethered with anchors (AnchorEntity class). Supports transform and asset animation, rigid body dynamics, PBR materials, HDR Image Based Lighting, raycasting and spatial audio. Let model = ModelEntity(mesh: box, materials: )
Let box = MeshResource.generateBox(size: 0.5) Sample code in Swift: weak var arView: ARView! Note that keeping the main CPU thread below 16.6 ms does not guarantee 60 fps performance. Many contemporary render features in RealityKit are On by default: camera's depth of field, face/person occlusion, grounding shadows, motion blur, camera grain, etc. Maybe your solution in some cases could be fake shadows. depth map) shadows, but on devices with A12.A16 chipsets we can render raytraced shadows. Pay particular attention to shadows on iOS – devices with A9.A11 chipsets produce projective (a.k.a. RealityKit has six materials: UnlitMaterial, SimpleMaterial, PhysicallyBasedMaterial (with 18 AOVs for controlling surface look), OcclusionMaterial, VideoMaterial and, of course, CustomMaterial. But RK is also heavily relies on the Metal and GPU hardware to perform multithreaded rendering. The framework runs an Entity Component System (ECS) on the CPU to manage tasks like physics, animations, audio processing, and network synchronization. In RealityKit, the main content is entities ( ModelEntity, AnchorEntity, TriggerVolume, BodyTrackedEntity, PointLight, SpotLight, DirectionalLight and PerspectiveCamera) that have components and can be created from resources like ModelEntity. The main advantage of RealityKit – it can complement / change / customize scenes coming from Reality Composer app, and it can be a powerful extension for ARKit – although it's quite possible that in the near future RealityKit will work completely standalone (without ARKit). There's no Objective-C legacy, RealityKit supports only Swift, and rather declarative syntax (like in SwiftUI).
RealityKit is made for AR / VR projects, has simplified settings for multi-user experience and can be used on iOS / macOS. This high-level framework was released in 2019. RealityKit (and RealityFoundation) is the youngest SDK in Apple family of rendering technologies.
This post is not only about RealityKit, SceneKit & Metal, but also about related APIs and USD files.
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