Setting a public variable on TrackAsset to be accessed in behaviour mixer

I'm trying to find a way to access a variable (currently set on the Track Asset) while processing the clips in the behaviour mixer, its a scriptable object that configures some texture offsets to switch between on the timeline clips.

Is there any way to access this or do I have to add the scriptable object reference on every clip?
(which seems a messy way to handle the data as its a "track" level setting) - but I can't understand from any examples or docs a way in which I can reference this variable.




Here's an example of the TrackAsset

Code (CSharp):

1. public class LipSwitcherTrack : TrackAsset
2. {
3.  
4.     public LipSwitcherPhonemsDefinition definitions;
5.     public override Playable CreateTrackMixer(PlayableGraph graph, GameObject go, int inputCount)
6.     {
7.         return ScriptPlayable<LipSwitcherMixerBehaviour>.Create (graph, inputCount);
8.     }
9. }

and the Mixer Behaviour PlayableBehaviour

Code (CSharp):

1. public override void ProcessFrame(Playable playable, FrameData info, object playerData)
2.     {
3.         m_TrackBinding = playerData as Material;
4.  
5.         if (!m_TrackBinding)
6.             return;
7.  
8.         int inputCount = playable.GetInputCount ();
9.  
10.         float greatestWeight = 0.3f; //using a float higher than 0 to avaoid any precicion issues - we only want playables at weight = 1 or at minum higher then .5 really
11.  
12.  
13.         //every frame it processes EVERY clip on the timeline....
14.         for (int i = 0; i < inputCount; i++)
15.         {
16.             float inputWeight = playable.GetInputWeight(i); //get the weight for this "blend"
17.  
18.  
19.             if ( inputWeight > greatestWeight){
20.                
21.                 greatestWeight = inputWeight;
22.                
23.                 ScriptPlayable<LipSwitcherBehaviour> inputPlayable = (ScriptPlayable<LipSwitcherBehaviour>)playable.GetInput(i);
24.                 LipSwitcherBehaviour input = inputPlayable.GetBehaviour ();
25.                
26. //
27.                 // This is were I need to be able to access the scriptable object set on the TrackAsset
28. //              
29.                 m_offset = input.offset;
30.  
31.                 if( m_lastOffset != m_offset){
32.  
33.                     m_TrackBinding.mainTextureOffset = m_offset;
34.                     m_lastOffset = m_offset;
35.                 }
36.  
37.  
38.             }
39.  
40.         }
41.     }

 

@seant_unity
thank you so much, I was having a complete mental block on this one.
You're first solution is exactly what I was looking for, its made the implementation so much more flexible, cheers!

 

Thi is not always a desirable solution though: having a variable fetched from the TrackAsset makes it "global" for all the clips on that Track, that's what should be possible.

If the variable is set on the clips at creation, it means that if you change the variable on the TrackAsset, then you need to change on the clips as well, not ideal.
Also, what happens if you drag a clip to another Track of the same type? really not ideal cause you might end up with a reference on another track. :S

 

Absolutely - it depends on your use case, always best to do what makes sense for your timeline and project.
For my usage this is the desired behaviour as the track is used for lip syncing and needs to hold the reference to the material and the clips contain the phoneme, which define how some texture offsets get processed on the material.

Again for my project this is the desired behaviour. When dragging between tracks I want the clips to reference a completely different material setup at the track level, but still hold their phoneme data.

 

It's the desirable behaviour for your project, and that's ok.
But it's not an answer to the question you asked in your first post and that should be clear to whoever comes across this thread; I just wanted to point out to @seant_unity that the answer provided works for you, but doesn't address the general issue you pointed out with your initial question ^^"