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Animation Replays on GameObject Re-enable

Under Audit

animationmemory management

Unity 2021.3.x - Unity 2023.3.x

Published 13 days ago

When a GameObject with an Animation component is disabled and re-enabled, its animation sequence may replay from the beginning. This behavior is typically observed with UI elements and is distinct from issues related to automatic playback or looping settings.

Issue

 When a GameObject that has an animation component is disabled and then re-enabled, its animation sequence may replay from the beginning. This behavior is observed particularly in UI menus, where returning from a sub-menu (e.g., an Options menu) causes the main menu's opening animation to trigger again. The initial animation scales the UI element to a 0x0 size. This issue is distinct from problems related to Animation components playing automatically without triggers or continuously looping. The desired outcome is to prevent the animation from replaying upon GameObject re-activation.

Experimental Fixes
  • Manually control the Animation playback state within a script, checking if the GameObject was previously enabled.
  • Set the Animation component’s “Play On Awake” property to false and trigger animations explicitly using code.
  • Utilize Animator controllers and their state machine capabilities to manage transitions and prevent unwanted re-entry into initial states upon GameObject re-activation.

Editor's Note:

The above fixes have not been verified by our audit team yet. They are provided exclusively for your own technical research. We recommend creating a backup of your project before proceeding with any attempts. Utilize at your own discretion!

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Content inspired by a Unity discussion post.