RealityKit – How to edit or add a Lighting?

问题:

I'm trying to add lighting in my RealityKit AR Scene. And I can't find the Lighting option in Reality Composer. If there's a way to add Directional Light or edit it then please tell me. I've tried Apple Documentation but can't understand how to add them.

回答1:

At the moment you can't do it in Reality Composer. Just use a RealityKit. So, you need to create a custom class that inherits from Entity class and conforms to HasPointLight protocol. Run this code in macOS project to find out how a PointLight setup works:

import AppKit
import RealityKit

class Lighting: Entity, HasPointLight {

    required init() {
        super.init()

        self.light = PointLightComponent(color: .red,
                                     intensity: 100000,
                             attenuationRadius: 20)
    }
}

class GameViewController: NSViewController {

    @IBOutlet var arView: ARView!

    override func awakeFromNib() {

        arView.environment.background = .color(.black)

        let pointLight = Lighting().light
        let boxAnchor = try! Experience.loadBox()

        boxAnchor.components.set(pointLight)
        arView.scene.anchors.append(boxAnchor)

        boxAnchor.steelBox!.scale = [9,9,9]
        boxAnchor.steelBox!.position.z = -0.5
    }
}

The same way you can add a Directional Light to the scene. But remember: a position of Directional Light does not important, but an orientation does! By default it's oriented to north (-Z).

class Lighting: Entity, HasDirectionalLight {

    required init() {
        super.init()

        self.light = DirectionalLightComponent(color: .red,
                                           intensity: 100000,
                                    isRealWorldProxy: true)
    }
}