ARKit – Light Estimation

Question

I am getting an error about init() not being available for ARLightEstimate.

Code:

class LightSensorManager {

    let lightEstimate = ARLightEstimate()  // <-- error is here
    var ambientLightIntensity: CGFloat

    init() {
        ambientLightIntensity = lightEstimate.ambientIntensity
    }
}

Error:

/*   'init()' is unavailable    */

API to ARLightEstimation - ARKit

I assume it is an abstract class? But I cannot find a concrete subclass of it. I only want to use the ambient Light sensor from this API to detect ambient Light.

Answer 1

Here's how you can use Light Estimation in ARKit – Full code version is HERE:

• Enable Light Estimation in viewWillAppear(_:) instance method:

   let configuration = ARWorldTrackingConfiguration()
   configuration.lightEstimationEnabled = true
  

• Update lighting in renderer(_:updateAtTime:) SceneKit's instance method:

   func renderer(_ renderer: SCNSceneRenderer, 
          updateAtTime time: TimeInterval) {
  
       guard let lightEstimate = sceneView.session.currentFrame?.lightEstimate 
       else { return } 
       spotLightNode.light?.intensity = lightEstimate.ambientIntensity
   }