Hi, sorry if this question has been posted before, but I couldn't find it. When the player clicks the pause button in my game, I use the typical method to stop all logic:

Time.timeScale = 0f;

Unfortunately this causes certain spine animations to throw errors either immediately or when the game resumes. Is this a supported way of pausing all Spines? I am using spine-unity-3.8-2021-07-12.unitypackage with Unity editor 2020.3.16f1.

Just to give a quick example, I'm getting an Index out of Bounds in this AnimationState.BinarySearch():

internal static int BinarySearch (float[] values, float target) {
   int low = 0;
   int high = values.Length - 2;
   if (high == 0) return 1;
   int current = (int)((uint)high >> 1);
   while (true) {
      if (values[current + 1] <= target)
         low = current + 1;
      else
         high = current;
      if (low == high) return (low + 1);
      current = (int)((uint)(low + high) >> 1);
   }
}

On this line:

if (values[current + 1] <= target)

If I modify Skeleton Animation.Update() to the following:

      void Update () {
         #if UNITY_EDITOR
         if (!Application.isPlaying) {
            Update(0f);
            return;
         }
#endif

// NEW GUARD
      if (Time.deltaTime <= 0.001f)
      {
        return;
      }

  Update(Time.deltaTime);
  }

It seems to generally work better, but sometimes I get that same exception immediately on pause, or an NaN exception in ApplyRotateTimeline() upon resume or pause. Any help would be appreciated, thank you!

Yes sure! Here's one of the NaN errors that appears sometimes when the game pauses and sometimes when it resumes. (This is without the little modification I mentioned above.)

ArithmeticException: Function does not accept floating point Not-a-Number values.
System.Math.Sign (System.Single value) (at <695d1cc93cca45069c528c15c9fdd749>:0)
Spine.AnimationState.ApplyRotateTimeline (Spine.RotateTimeline timeline, Spine.Skeleton skeleton, System.Single time, System.Single alpha, Spine.MixBlend blend, System.Single[] timelinesRotation, System.Int32 i, System.Boolean firstFrame) (at Assets/Spine/Runtime/spine-csharp/AnimationState.cs:561)
Spine.AnimationState.Apply (Spine.Skeleton skeleton) (at Assets/Spine/Runtime/spine-csharp/AnimationState.cs:271)
Spine.Unity.SkeletonAnimation.ApplyAnimation () (at Assets/Spine/Runtime/spine-unity/Components/SkeletonAnimation.cs:225)
Spine.Unity.SkeletonAnimation.Update (System.Single deltaTime) (at Assets/Spine/Runtime/spine-unity/Components/SkeletonAnimation.cs:211)
Spine.Unity.SkeletonAnimation.Update () (at Assets/Spine/Runtime/spine-unity/Components/SkeletonAnimation.cs:196)

Yes, emailed, thank you!

In case it helps, here's a stack trace from when it throws an IndexOutofRange:

IndexOutOfRangeException: Index was outside the bounds of the array.
Spine.Animation.BinarySearch (System.Single[] values, System.Single target) (at Assets/Spine/Runtime/spine-csharp/Animation.cs:115)
Spine.DeformTimeline.Apply (Spine.Skeleton skeleton, System.Single lastTime, System.Single time, Spine.ExposedList`1[T] firedEvents, System.Single alpha, Spine.MixBlend blend, Spine.MixDirection direction) (at Assets/Spine/Runtime/spine-csharp/Animation.cs:1174)
Spine.AnimationState.Apply (Spine.Skeleton skeleton) (at Assets/Spine/Runtime/spine-csharp/AnimationState.cs:257)
Spine.Unity.SkeletonAnimation.ApplyAnimation () (at Assets/Spine/Runtime/spine-unity/Components/SkeletonAnimation.cs:225)
Spine.Unity.SkeletonAnimation.Update (System.Single deltaTime) (at Assets/Spine/Runtime/spine-unity/Components/SkeletonAnimation.cs:211)
Spine.Unity.SkeletonAnimation.Update () (at Assets/Spine/Runtime/spine-unity/Components/SkeletonAnimation.cs:196)

In both cases, I have characters on the jog_backward and jog_forward animations, so it's likely related to those. It doesn't happen on the other animations.

I do have another totally different animation with the same issue, so let me know if you'd like to see that one.

Sent! Thank you so much for taking a look.

Ah! It was my fault. I use this function to sync the speed of a character's walk cycle to the speed of its motion, where stride is the units per full walk cycle:

public void SyncWalkToVel(Vector2 currXY, Vector2 oldXY, float stride, int trackID = 0)
{
  GetTrackEntry(trackID).TimeScale = ((Vector2.Distance(oldXY, currXY) / Time.deltaTime) / stride);
}

The problem is if Time.deltaTime is 0 (because Time.timeScale is 0), it won't crash but it will pass NaN to track.TimeScale, which will later cause an issue when it tries to update. So instead I have changed it to this:

public void SyncWalkToVel(Vector2 currXY, Vector2 oldXY, float stride, int trackID = 0)
{
  float modifiedTime = 0.0f;

  // this prevents a divide by 0 error
  if (Time.deltaTime >= 0.001f &&
      stride >= 0.001f)
  {
    modifiedTime = (Vector2.Distance(oldXY, currXY) / Time.deltaTime) / stride;
  }
  

  GetTrackEntry(trackID).TimeScale = modifiedTime;
}

Does this equation look correct to you guys based on what I'm trying to do? Meaning, will the player's walk animation speed properly compensate for deltaTime, which may fluctuate?

Okay great! Thank you both as always for your expertise and responsiveness.