RealityKitでusdzを読み込む

ARViewのSceneに追加するにはanchorが必要になるので適当なアンカーを付け足す。

public class USDZ: Entity, HasAnchoring {
  public var anchoring: AnchoringComponent {
    get {
      return anchorEntity.anchoring
    }
    set {
      anchorEntity.anchoring = newValue
    }
  }

  private var anchorEntity = AnchorEntity(world: .zero)
}

extension USDZ {
  public static func load(contentsOf url: URL) throws -> USDZ {
    let root = try Entity.load(contentsOf: url)
    let usdz = USDZ()
    root.setParent(usdz, preservingWorldTransform: true)
    return usdz
  }
}