Generate curves for float properties in custom behaviour

Check this blog post for examples of how to create custom tracks for timeline to do this:

https://blogs.unity3d.com/2018/09/05/extending-timeline-a-practical-guide/

The 'Light Intensity' track demonstrates this.



There is a downloadable example project with the sample tracks linked from the blog post.

 

Here's an example that should help

Code (CSharp):

1. public class ExamplePlayableAsset : PlayableAsset
2. {
3.     [Serializable]
4.     public class ExamplePlayableBehaviour : PlayableBehaviour
5.     {
6.         public float animatedField;
7.     }
8.    
9.     public ExamplePlayableBehaviour template;
10.     ...
11. }
12.  
13. void AnimateField(TimelineClip clip)
14. {
15.     if (clip.curves == null)
16.         clip.CreateCurves("AnimatedFields"); // name of the animation clip in Project Window
17.  
18.     clip.curves.SetCurve(string.Empty,
19.         clip.asset.GetType(), // or typeof(ExamplePlayableAsset), i.e. the playable asset type
20.         "animatedField", // the field of the playable behaviour to animate
21.         AnimationCurve.Linear(0, 0, (float) clip.duration, 1) // the curve in local time of the timeline clip
22.     );
23. }