Problems Mixing Timeline Playables

When trying to blend the weights between two timeline playables only the timeline in the first slot of the AnimationMixerPlayable will play.

If I fill the second slot of the animation mixer with an AnimationClipPlayable, the timeline and animation will correctly blend.

As soon as I switch the slots of the timeline and animation in the mixer, so that the timeline is in the second slot. The animation in the timeline no longer affects the character.

Essentially what I have seen is that anytime a timeline is connected to an animation mixer's second slot, it won't affect the character.

The code below illustrates the broken case. Swapping the index of the timeline Playable and the AnimationClipPlayable in the mixer allows them to crossfade correctly.

Code (CSharp):

1. using UnityEngine;
2. using UnityEngine.Playables;
3. using UnityEngine.Animations;
4. using UnityEngine.Timeline;
5.  
6. public class AnimationController_Test_Example : MonoBehaviour
7. {
8.     public float weight;
9.  
10.     // Animation clip to play
11.     public AnimationClip clip;
12.     // Timeline to play
13.     public TimelineAsset timeline;
14.  
15.     PlayableGraph m_PlayableGraph;
16.     AnimationMixerPlayable m_Mixer;
17.  
18.  
19.     void Start()
20.     {
21.         m_PlayableGraph = PlayableGraph.Create();
22.  
23.         // Create a playable asset frome the timeline.
24.         Playable timelinePlayable = timeline.CreatePlayable(m_PlayableGraph, gameObject);
25.  
26.         // Get the animation output that is generated from the timeline playable and set it's target to our animator.
27.         AnimationPlayableOutput playableOutput = (AnimationPlayableOutput)m_PlayableGraph.GetOutputByType<AnimationPlayableOutput>(0);
28.         playableOutput.SetTarget(GetComponent<Animator>());
29.  
30.  
31.         // Create an animation clip playable.
32.         AnimationClipPlayable animPlayable = AnimationClipPlayable.Create(m_PlayableGraph, clip);
33.  
34.         // Create an animation mixer with 2 inputs
35.         m_Mixer = AnimationMixerPlayable.Create(m_PlayableGraph, 2);
36.  
37.         // Connect the timeline playable and animation clip playable to the anim mixer
38.         // BUG ??? When assigning the timelinePlayable to the second slot (index 1) the timeline does not affect the player.
39.         // If the timelinePlayable is assigned to the first slot (index 0) then the 2 playbles mix as expected.
40.         m_Mixer.ConnectInput(0, animPlayable, 0);
41.         m_Mixer.ConnectInput(1, timelinePlayable, 0);
42.  
43.         // Set the mixer as the playable output's source.
44.         playableOutput.SetSourcePlayable(m_Mixer);
45.  
46.         // Play the graph.
47.         m_PlayableGraph.Play();
48.  
49. #if UNITY_EDITOR
50.         GraphVisualizerClient.Show(m_PlayableGraph, name + " (Anim Controller)");
51. #endif
52.     }
53.  
54.     void Update()
55.     {
56.         weight = Mathf.Clamp01(weight);
57.  
58.         m_Mixer.SetInputWeight(0, 1.0f - weight);
59.         m_Mixer.SetInputWeight(1, weight);
60.     }
61. }
62.  

The playable graph for each scenario shows the following.



Is this a bug or am I using the Playables/Timeline API incorrectly?

Thanks!

 

Bump: Updated the description and added an image of the playable graph visualizer.

 

@seant_unity thanks for the response! Any chance that there is a work around or fix planned in the near future?

 

Okay thanks!

 

@seant_unity Posted a bug report for what it's worth.

https://fogbugz.unity3d.com/default.asp?952966_0hmapiio9oiplo7l

 

@seant_unity When you refer to the animation outputs as being "stacked", does this mean that each animation output (for a single animator) is adding it's transformations to the previous one?

 

I've got the same issue, when I create a graph and try to blend between two timelines the timeline in the second index appears to be playing but doesn't actually output animation.

 

here's my code (based on the previous post, but mixing 2 timelines instead of a timeline and a clip)

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.Playables;
5. using UnityEngine.Timeline;
6. using UnityEngine.Animations;
7.  
8. public class AnimationControl : MonoBehaviour
9. {
10.     public TimelineAsset timeline1;
11.     public TimelineAsset timeline2;
12.  
13.     public float weight;
14.  
15.     PlayableGraph m_PlayableGraph;
16.     AnimationMixerPlayable m_Mixer;
17.  
18.     public Animator anim;
19.  
20.  
21.     void Start()
22.     {
23.         m_PlayableGraph = PlayableGraph.Create();
24.         Debug.Log(m_PlayableGraph.GetOutputCount());
25.  
26.         // Create a playable asset frome the timeline.
27.         Playable timelinePlayable1 = timeline1.CreatePlayable(m_PlayableGraph, gameObject);
28.         Playable timelinePlayable2 = timeline2.CreatePlayable(m_PlayableGraph, gameObject);
29.  
30.         // create an animation output on the graph
31.         AnimationPlayableOutput.Create(m_PlayableGraph, "Animation", anim);
32.  
33.         // Get the animation output that is generated from the timeline playable and set it's target to our animator
34.         AnimationPlayableOutput playableOutput = (AnimationPlayableOutput)m_PlayableGraph.GetOutputByType<AnimationPlayableOutput>(0);
35.         playableOutput.SetTarget(anim);
36.  
37.         // Create an animation mixer with 2 inputs
38.         m_Mixer = AnimationMixerPlayable.Create(m_PlayableGraph, 2);
39.  
40.         // Connect the timeline playable and animation clip playable to the anim mixer
41.         // BUG ??? When assigning the timelinePlayable to the second slot (index 1) the timeline does not affect the player.
42.         // If the timelinePlayable is assigned to the first slot (index 0) then the 2 playbles mix as expected.
43.         m_Mixer.ConnectInput(0, timelinePlayable1, 0);
44.         m_Mixer.ConnectInput(1, timelinePlayable2, 0);
45.  
46.         // Set the mixer as the playable output's source.
47.         playableOutput.SetSourcePlayable(m_Mixer);
48.  
49.         // Play the graph.
50.         m_PlayableGraph.Play();
51.  
52.         #if UNITY_EDITOR
53.         GraphVisualizerClient.Show(m_PlayableGraph, name + " (Anim Controller)");
54.         #endif
55.     }
56.  
57.     void Update()
58.     {
59.         weight = Mathf.Clamp01(weight);
60.  
61.         m_Mixer.SetInputWeight(0, 1.0f - weight);
62.         m_Mixer.SetInputWeight(1, weight);
63.     }
64. }
65.  

 

Was this bug ever resolved? It shows it's closed but I am using a two timeline solution as well and only one actually outputs.

 

I think this has been resolved in Unity 2018 (which is still in beta) because I know they did a lot of timeline fixes for 2018. But I haven't tested it yet so I don't know.

 

We are still getting this in 2018.1 though I see the bug was closed several months ago. Can we get confirmation on what version this fix is supposed to exist in?

 

Thanks. That will be a big help. Will that be a patch release for 2018.1 then? Just so we know what to look out for.

 

The animation blending issue is fixed for 2018.2, I've tested blending two timelines which work quite well.
However, there is an issue there for audio mixer playable. It doesn't work at all for blending several audios regardless of the weight value. Besides, it's very easy to crash when I change the audio playable graph at runtime.

 

@seant_unity Is this fix also in to 2017.4.6f1?