Send messages to the scene

Question

Created Jun ’24

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I saw onnoffitacation in the Behavior configuration of Reality Composer pro, which asked me to enter the Nofficatition name, that is to say, this requires swift in Xcode to send a message. There is a message name in the message, so I hope you can write an list for me how to use Swift in Xcode to send a message containing the message name.

Answered by Vision Pro Engineer in 791192022

Use the following snippet to post the notification.

NotificationCenter.default.post(
  name: NSNotification.Name("RealityKit.NotificationTrigger"),
  object: nil,
  userInfo: [
    "RealityKit.NotificationTrigger.Scene": scene,
    "RealityKit.NotificationTrigger.Identifier": "Name_You_Provided_On_Trigger_In_RCP"
  ]
)

In the above snippet, scene refers to the RealityKit scene.

@Environment(\.realityKitScene) var scene

Note: The interaction system won't be ready to receive Notifications right away, so wait at least half a second after loading your content before posting the notification.

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Answer 1

Vision Pro Engineer OP

Apple

Jun ’24

Accepted Answer

Recommended

Use the following snippet to post the notification.

NotificationCenter.default.post(
  name: NSNotification.Name("RealityKit.NotificationTrigger"),
  object: nil,
  userInfo: [
    "RealityKit.NotificationTrigger.Scene": scene,
    "RealityKit.NotificationTrigger.Identifier": "Name_You_Provided_On_Trigger_In_RCP"
  ]
)

In the above snippet, scene refers to the RealityKit scene.

@Environment(\.realityKitScene) var scene

Note: The interaction system won't be ready to receive Notifications right away, so wait at least half a second after loading your content before posting the notification.

3

Answer 2

milanowth OP

Sep ’24

Thanks for the reply and I believe my timeline is triggered by this notification. Because I append a notification action in this timeline and in my code I can receive the message from that action.

However, the TransformTo and Hide actions in the same timeline doesn't seem to be triggered. I have played that timeline in RCP, it went well. Note that TransformTo and Notification actions are targeted to the same Entity in the scene. And my Hide action targeting to a child entity of it. Any idea why this may happen? Thanks.

(I also tried using applyTapForBehaviors on the entity, but it;s still not working

0