Unable to retrieve ARDirectionalLightEstimate

Question

Hi All,

I am unable to retrieve the "ARDirectionalLightEstimate" instance from the ARFrame in a face-tracking AR session.

The "lightEstimate" property of ARFrame gives me a "ARLightEstimate" object and not an "ARDirectionalLightEstimate". The below code return "false"

ARsession.currentFrame?.lightEstimate is ARDirectionalLightEstimate

It would be great if someone can please share as to how we can extract the "ARDirectionalLightEstimate" instance in a face tracking AR session.
Thanks for your help _/\_
Best Regards,

Sumit

ARKit

345

Posted by

Sumit_

Reply

Add a Comment

Answer 1

Thanks for the suggestion @gchiste _/\_. It helped to to arrive at correct solution using ARSCNViewDelegate

I use the below code snippet to retrieve the directional light estimate

extension MyViewController: ARSCNViewDelegate {
    func renderer(_ renderer: SCNSceneRenderer, updateAtTime time: TimeInterval) {
        DispatchQueue.global(qos: .default).async {
            guard let frame = self.specScnView.session.currentFrame else { return }
            if frame.lightEstimate is ARDirectionalLightEstimate
            {
                self.dirLightEst = frame.lightEstimate as? ARDirectionalLightEstimate
            }
        }
    }

Posted by

Sumit_

Add a Comment

Answer 2

Are you checking the ARFrame whenever it is updated in session(_:didUpdate:)? They will not be available at first, but once a face is detected, you should start receiving ARDirectionalLightEstimates.

Posted by

gchiste

Add a Comment

Answer 3

Thanks for the suggestion @gchiste _/\_. It helped to to arrive at correct solution using ARSCNViewDelegate

I use the below code snippet to retrieve the directional light estimate

extension MyViewController: ARSCNViewDelegate {
    func renderer(_ renderer: SCNSceneRenderer, updateAtTime time: TimeInterval) {
        DispatchQueue.global(qos: .default).async {
            guard let frame = self.specScnView.session.currentFrame else { return }
            if frame.lightEstimate is ARDirectionalLightEstimate
            {
                self.dirLightEst = frame.lightEstimate as? ARDirectionalLightEstimate
            }
        }
    }

Posted by

Sumit_

Add a Comment

Unable to retrieve ARDirectionalLightEstimate

Accepted Reply

Replies