Have you got this working?

A simple approach would be to assign the button object as a child of your model, or a GameObject encapsulating your model. Then execute your animation from the Trackable's event handler - either the Default Trackable Event Handler, or a custom event handler that you write.You could use an Animation component, or animate the button procedurally.

never mind, found something. working that out

ahaa i think i understand. i'll give it a go tomorrow.

sorry for not being more clear, i thought Unity was almost standard in combination with Vuforia, therefore forgot to mention.

(Your generic use of the word 'scene' in the iOS forum wasn't sufficient for me to guess you are using Unity...)

Look at the QCARManager script - the Update() method calls UpdateTrackers() which monitors the detected status.

You can use the same state, or create your own state property, then your UI script can use that state to decide what buttons need to be drawn.

But in that case you make them within Xcode and not in Unity ?

I had already set up some buttons within unity, so that way i can link the button actions to the model.
Or is that what i am suppose to do, except making them show/hide in Xcode ?

Mm a bit into coding with JS and C#, but not yet in Xcode. you'd you explain a bit more please?
Thank you very much in advance.

Hi BallastAR,

The recommended way is to have the buttons already created and hidden in the view hierarchy (put them as younger siblings of the EAGLView not as children). If you're using QCAR 1.5 then you could add another view between the AR view and the overlay view.

Then in renderFrameQCAR you'd implement some logic to trigger a 'detected' state, and call a method on the main thread that unhides the buttons.

To rehide the buttons maybe use a timeout, so that when the trackable hasn't been seen for a set period you can rehide the buttons.