Feedback What is the point of a TrackBindingType if you can't easily get it from a PlayableBehaviour?

This seems so ridiculous to me. Forgive me for being super blunt about this, but it's incredibly frustrating.

I've been looking through the docs for the past hour and haven't found a way to just easily and quickly get the bound object of a timeline track from a PlayableBehaviour. I'm not talking about using PlayableDirector.GetGenericBinding, that defeats the purpose.

If this isn't how track bindings are meant to work, then what's the point of them?

And if this is the point of them, then why is it so complicated to get the bound object?

Edit: I'm seeing now that it's passed as

object playerData

in

ProcessFrame

but it's impossible to get it in OnBehaviourPlay or elsewhere.

This is.. really unfortunate.

 

There is a way, but it's convoluted...

In the TrackAsset:

Code (CSharp):

1. public override Playable CreateTrackMixer(PlayableGraph graph, GameObject go, int inputCount)
2. {
3.       var binding = go.GetComponent<PlayableDirector>().GetGenericBinding(this) as ExampleController;
4.          
5.       foreach (var c in GetClips())
6.           ((ExampleControlAsset)(c.asset)).Binding = binding;
7.          
8.       return ScriptPlayable<ExampleControlBehaviour>.Create(graph, inputCount);
9. }

Of course you also have to pass the reference from the PlayableAsset to the PlayableBehaviour

Code (CSharp):

1. public override Playable CreatePlayable(PlayableGraph graph, GameObject owner)
2. {
3.     var playable = ScriptPlayable<ExampleControlBehaviour>.Create(graph, template);
4.  
5.     var behaviour = playable.GetBehaviour();
6.     behaviour.Binding = Binding;
7.          
8.     return playable;
9. }

I couldn't agree with more though. I will never understand why playerData isn't passed to OnBehaviourPlay/OnBehaviourPause. It makes no sense.

 

I'm trying this myself and the `Binding` field on the Asset appears to be getting set when I step through the code, but in the inspector the field says "Type mismatch" (although it is the right type) and the field on the Behaviour remains null.

 

Run into this problem, I found a solution
You can get the binding in ExampleMixerBehaviour's ProcessFrame method, then pass that data to your ExampleBehaviour.

Code (CSharp):

1.     public override void ProcessFrame(Playable playable, FrameData info, object playerData)
2.     {
3.         //all the class like ExampleBinding,ExampleBehaviour etc, you can replace "Example" with your class
4.         var trackBinding = playerData as ExampleBinding;
5.  
6.         if (trackBinding == null)
7.             return;
8.  
9.         int inputCount = playable.GetInputCount ();
10.  
11.         for (int i = 0; i < inputCount; i++)
12.         {
13.             ScriptPlayable<ExampleBehaviour> inputPlayable = (ScriptPlayable<ExampleBehaviour>)playable.GetInput(i);
14.             ExampleBehaviour input = inputPlayable.GetBehaviour();
15.             //now you can feed the playerData's binding to your ExampleBehaviour, to then run OnBehaviourPlay,Pause with binding.
16.             input.trackBinding = trackBinding;
17.         }
18.     }

 

in the class method overrides (like OnBehaviourPlay) you can find this information in FramData

info.output.GetUserData();

The information is out there, it's just that is not presented in a friendly way

 

Thank you! I wish that would be presented in the Default Playable (Unity provide wizard to make Timeline track in that) but I have to go to forum for this.

 

T

Wow this is so buried. Thanks.