Using AnimationPlayer::seek_to – is this a bug, or am I using it wrong?

[ian-h-chamberlain]

Hello, I was trying to debug an animation issue on a project of mine, initially thought it might be fixed by the 0.12.1 animation changes, but now I'm not sure.

I tried a minimal reproduction using the animated_transform example with two cases, and I was surprised to see similar behavior to my project. Essentially, I am trying to seek_to the end of the clip, and I expected the result to look the same as the end of playing the animation, but it looks different!

First case (play animation to end)

diff --git a/examples/animation/animated_transform.rs b/examples/animation/animated_transform.rs
index 0a3aa0239..4246c659a 100644
--- a/examples/animation/animated_transform.rs
+++ b/examples/animation/animated_transform.rs
@@ -109,11 +109,11 @@ fn setup(
         },
     );
 
     // Create the animation player, and set it to repeat
     let mut player = AnimationPlayer::default();
-    player.play(animations.add(animation)).repeat();
+    player.play(animations.add(animation));
 
     // Create the scene that will be animated
     // First entity is the planet
     commands
         .spawn((

Screenshot after the animation has played:

Second case (seek to end of clip)

Second case:

diff --git a/examples/animation/animated_transform.rs b/examples/animation/animated_transform.rs
index 0a3aa0239..f6e8b456e 100644
--- a/examples/animation/animated_transform.rs
+++ b/examples/animation/animated_transform.rs
@@ -109,11 +109,12 @@ fn setup(
         },
     );
 
     // Create the animation player, and set it to repeat
     let mut player = AnimationPlayer::default();
-    player.play(animations.add(animation)).repeat();
+    let duration = animation.duration();
+    player.play(animations.add(animation)).seek_to(duration);
 
     // Create the scene that will be animated
     // First entity is the planet
     commands
         .spawn((

Screenshot:

Am I missing something about how this API is supposed to work, or is this something that could be considered a bug? If so, is there some way I can work around it so that the objects are spawned as if they had played their animations to completion? Thanks!

[A-Walrus]

I think this might be related to #10832

[ian-h-chamberlain]

Ahh, thank you! I was able to use the changes from #10842 to fix the issue I was seeing, both in the animated_transform example and my project! Hopefully that change makes it in for 0.13 but in the meantime I can use your fork, so thanks for the pointer.