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Question Customize-able nested track like control track

Discussion in 'Timeline' started by x4637x, Aug 22, 2020.

  1. x4637x


    May 9, 2017
    I was digging information all day long about how to create a set of custom track/asset/behaviour that can use another type of custom track/asset/behaviour, as to how we could use Control track to control another timeline.

    My main objective is to make some subtitle for our animation, but need to sync audio & text colour rendering word by word. And there will be a lot of sentences as well.

    So I was thinking about making a custom track act as the sentence track, where it contains all the words as playable clips under its sub-track so we can do some detail adjustment to each word.

    My question is: can we use timeline like that?
  2. seant_unity


    Unity Technologies

    Aug 25, 2015
    You can - but it requires you to use two different playable directors.

    To create your own subtimeline track, your custom track clip can have a ClipEditor that implements GetSubTimelines to return the nested timeline/playableDirector.

    For control tracks, it nests by having the user explicitly assign the playable director with the sub timeline, but you could change the workflow and auto-create what you need.

    Code (CSharp):
    1.     [CustomTimelineEditor(typeof(ControlPlayableAsset))]
    2.     class ControlPlayableAssetEditor : ClipEditor
    3.     {
    5.         public override void GetSubTimelines(TimelineClip clip, PlayableDirector director, List<PlayableDirector> subTimelines)
    6.         {
    7.         ... // add the nested timeline to the subTimelines list
    8.         }
    9.     }