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Spine animation occasionally pauses for a few frames

kaanyy

We're experiencing an issue with our Spine animation (see screenshots below for context). The animation plays smoothly in the Spine editor at 60fps and initially works correctly in Unity. However, when we restart the animation, it sometimes freezes for 2-3 frames on a random pose.

We're setting and starting the animation like this:

    // This does not help: skeletonAnimation.AnimationState.ClearTracks();
    var entry = skeletonAnimation.AnimationState.SetAnimation(0, animation, isLoop);

Can you help us to investigate? Why it happens? (Note I couldn't updated the videos to show pause) [

{Export-1}

{Expor-2}

{Unity-Setting}

Spinebot

I understand you're experiencing intermittent freezing for 2-3 frames when restarting Spine animations in Unity. This is a tricky issue to diagnose without more information, but here are several potential causes and solutions:

Potential Causes and Solutions:

1. Timing of SetAnimation Calls
The most common issue is calling SetAnimation() at the wrong time in Unity's update cycle. Make sure you're:

Not calling SetAnimation() every frame (which you seem to be avoiding already)
Calling it at the appropriate time in your update cycle
Not modifying the skeleton immediately before or after the call

2. Animation Clean Up Export Setting
I notice from your export settings screenshot that Animation clean up appears to be enabled. This setting removes keys that are identical to the setup pose, which can cause issues when layering animations or restarting animations. Try:

Disabling Animation clean up in your Spine export settings
Re-exporting your skeleton
Reimporting in Unity

3. First Frame Issues
If the animation is freezing on a specific pose, it could be related to how the first frame is being handled. You might want to try:

var entry = skeletonAnimation.AnimationState.SetAnimation(0, animation, isLoop);
entry.TrackTime = 0; // Explicitly set to first frame

Or enable holdPrevious if you're transitioning from another animation:

entry.holdPrevious = true;

More info: TrackEntry.holdPrevious

4. Profiling the Issue
To better understand what's happening, I'd recommend:

Using Unity's Profiler to see if there are performance spikes
Checking the Rendering Statistics window
Reviewing the Spine Metrics view in your project

5. Send Us a Minimal Project
If none of these suggestions help, we'd be happy to investigate further. Could you send us a minimal Unity project that still demonstrates this issue? You can send it as a zip file to contact@esotericsoftware.com, briefly mentioning this issue so we have context.

Please include:

Your exact spine-unity runtime version (found in Assets/Spine/version.txt)
The problematic skeleton files (the three exported files: .json/.skel.bytes, .atlas.txt, and .png)
A simple script that reproduces the freezing behavior

This will allow us to reproduce and fix the issue directly.

Harald

@kaanyy The provided context is unfortunately not enough to provide useful help.

Which exact version of the spine-unity runtime (name of the unitypackage, also listed in Assets/Spine/version.txt, or version in the Unity Package Manager window) are you using?
What are your Edit - Preferences settings showing under Spine, what are your settings under Threading Defaults? Have you enabled threading for animation or mesh generation? If so, does it still happen when disabling the settings?
Are you seeing any warnings or messages in the Console window?
Have you upgraded your Unity project from an older version of the spine-unity before the main components were split? If so, did you follow the 4.3 upgrade guide here?

In general we would require a minimal Unity project which still shows this issue, as Spinebot mentioned under "5. Send Us a Minimal Project" to be able to help diagnose the issue properly.

kaanyy

Hi Harald,
Thank you for getting back to me.
I've set up a reproduction case in this repository: https://github.com/playabit-hub/temp-spine-bug
In the root folder, you'll find a video demonstrating the issue (named Pauses.mov). As you can see, the Spine animation fails to update on certain frames. I've documented some of the problematic frames in the README.md (though not all of them).
There are no console warnings, and I'm using the latest Spine 4.3 (beta) runtime with an animation that was created and exported from scratch.