RealityKit – How to edit or add a Lighting?

Question

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.

Can you add your image in stackoverflow rather than using an external service. If your image gets removed, the question will not make sense for future people having a similar issue. — Constantin Chirila, Jan 15 '20 at 08:04
since I don't have enough points. It says 10 points to add image in post — Saad Tahir, Jan 15 '20 at 08:32

Andy Jazz · Accepted Answer · 2020-07-24T18:02:39.737

At the moment you can't do it in Reality Composer, you need to 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)
    }
}

Also can read my STORY about lights on Medium.

Thanks man. The lighting works. But the shadows are still too dark. Actually I want the shadows to be dimmed. Is there a way for that? — Saad Tahir, Jan 17 '20 at 07:00
Saad, please, publish another question (and give me a link here). I'll try to answer it. — Andy Jazz, Jan 17 '20 at 07:13
I asked the question here: https://stackoverflow.com/questions/59782819/how-can-i-reduce-the-intensity-of-the-shadows-of-these-models-in-reality-kit — Saad Tahir, Jan 17 '20 at 07:23

RealityKit – How to edit or add a Lighting?

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