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Signal Emitter does not emit reaction when Playable Director's Update Method is set to Manual



How to reproduce:
1. Open user's attached project ('')
2. Open scene 'New' and click on the Director object
3. Inspect the Signal Emitter in the DirectorTimeline, make sure that it has a reaction that sets GameObject.SetActive to False
4. Enter Play mode

Expected results: The cube in the scene disappears at the time mark where the Signal Emitter is
Actual results: The cube does not disappear (Signal Emitter reaction has not been called)

Reproducible with: 2019.1.1f1, 2019.2.0a14, 2019.3.0a1
Timeline Signals were introduced in 2019.1.

Note: To see what it should look like, change Playable Director's Update Method to Game Time.

  1. Resolution Note (2019.3.X):

    The Evaluate method only samples the director (PlayableGraph) at a given time; evaluating a director is not the same as playing a director. Signals will be emitted and audio will be played only when the director is played. Calling PlayableDirector.Evaluate is like scrubbing in the Timeline window. 

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