CODEWITHSUNDEEP
augmented-realityarkitrealitykitreality-composer
ZbadhabitZ
ZbadhabitZ

Reputation: 2913

Adding ground shadows to a USDZ model in RealityKit?

For some time now, I have been trying to add a realistic ground shadow to an object in RealityKit. For my use case, I will not be using Reality Composer, nor (per this question) will I be using an anchor entity from a horizontal plane (my user will tap to place an object and that tap could align with either a horizontal plane or an ARMeshAnchor, as we support LiDAR in our app).

When I test my USDZ model via QuickLook on iOS, I see that iOS adds a shadow beneath my model, and while not wholly realistic, it appears a bit more "placed" on a surface, as compared to no shadow.

In trying to add my model, I am taking the following steps;

self.model = Entity.load(named: "model.usdz")

When a user taps on the screen, I perform a raycast and add the model to the built anchor;

func session(_ session: ARSession, didAdd anchors: [ARAnchor]) {
   for anchor in anchors {
      if anchor.name == "tapped" {
         let anchorEntity = AnchorEntity(anchor: anchor)
         anchorEntity.addChild(self.model!)
         arView.scene.addAnchor(anchorEntity)
      }
   }
}

When the model is added to the tapped point, there are no ground shadows. As a test, I had gone down the path of trying to add a Directional Light, believing that its placement may cast a light on the object and, therefore, create shadows. I create the light like so;

class Lighting: Entity, HasDirectionalLight {
    required init() {
        super.init()
        self.light = DirectionalLightComponent(color: .white, intensity: 5000, isRealWorldProxy: true)
    }
}

I've added a global var lightEntity = AnchorEntity(). Then, in my viewDidLoad method, I am attempting to set up the light like so;

let spotLight = Lighting().light
let shadow = Lighting().shadow
lightAnchor.components.set(shadow!)
lightAnchor.components.set(spotLight)
arView.scene.anchors.append(lightAnchor)
self.model = Entity.load(named: "model.usdz")

While I can see that there is a light shining on the object, it does not seem to cause any shadows to be cast.

Upvotes: 1

Views: 849

Answers (1)

闪电狮
闪电狮

Reputation: 556

if your app supports LiDAR , you can use

arView.environment.sceneUnderstanding.options.insert(.receivesLighting)

Upvotes: 1

Related Questions