Lab 104 – Portal Orb

struct Lab104: View {

    var body: some View {
        RealityView { content in

            // 1. The root for our scene *outside* of the portal
            guard let rootEntity = try? await Entity(named: "PortalSwapRed", in: realityKitContentBundle) else { return }
            content.add(rootEntity)

            // 2. The root for the content that will appear *inside* the portal
            // We need a WorldComponent here
            let portalContentRoot = Entity()
            portalContentRoot.components.set(WorldComponent())
            rootEntity.addChild(portalContentRoot)

            guard let portalGlass = try? await Entity(named: "PortalGlass", in: realityKitContentBundle) else { return }
            portalGlass.components.set(ManipulationComponent())
            portalGlass.position = [-0.7, 1.4, -1.5]
            rootEntity.addChild(portalGlass)

            // 3. We need something to render the portal on
            if let lens = portalGlass.findEntity(named: "Lens") {

                // Replace the material with PortalMaterial
                lens.components[ModelComponent.self]?.materials[0] = PortalMaterial()

                // We also need to add a PortalComponent that targets the portalContentRoot
                lens.components.set(PortalComponent(target: portalContentRoot))

            }

            // 4. We'll load some content to add to the portalContentRoot
            guard let scene = try? await Entity(named: "PortalSwapBlue", in: realityKitContentBundle) else { return }
            portalContentRoot.addChild(scene)

        }
    }
}