• Unity

  • [Runtime 3.5] AddAnimation returns negative delay time

    anglais
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Hi,

Either I've found a bug or am not quite understanding of what's going on.
Issue is this, when I call this method on AnimationState:

public TrackEntry AddAnimation (int trackIndex, Animation animation, bool loop, float delay)

with the delay parameter set to 0, according to the comment and documentation it should calculate the proper delay time based on the previously queued animations.
However, this didn't seem to be working for me. After some investigation I found that this line:

delay += duration * (1 + (int) (last.trackTime / duration)) - data.GetMix(last.animation, animation);

can generate delay times that are negative (less than 0).

The result of that is that those animations that should be queued aren't played at all.
Since I'm not intimately familiar with the Spine codebase, my quick fix has been to add parenthesis to avoid ever generating negative numbers:

delay += duration * ((1 + (int) (last.trackTime / duration)) - data.GetMix(last.animation, animation));

I'd like to know if this is a bug and how to properly fix this.

Thanks.

An actual negative delay is normal when there's mixing, even if you didn't pass a negative delay.

Are your animations shorter than the mix duration?

In those cases, you may just have to set the mix duration to 0 or at much shorter than your animation's duration.
If you don't want to change the default mix, you can just set it for that specific queued animation.