Animation Control Problem For Blend One In State Machine (Flutter)

[BlockRen]

Description:

I've encountered an issue with the control of animations in my Flutter project that the animation is blend in state machine animation.

Animation Implementation Details:

• The .riv files utilize a state machine to manage the animation flow.
• Number inputs are employed to control the transitions within the animation flow.
• Some states within the state machine are blends, which are mixtures of two regular Timeline animations.

Steps to Reproduce the Issue:

• Retrieve the state machine animation's input using SMINumber.
• Change the value by calling 'ctrl.value'.
• While regular timeline animations play as expected, the blend animations do not respond and show no signs of playback.

Reproduction Environment:

Development Environment:

• MacOS Sonoma 14.5
• Android Studio Koala Feature Drop | 2024.1.2
• Device:
  Pixel 4a 5G
  Android Version 14
• Flutter Environment:
  Flutter 3.22.2 • channel stable
  Framework • revision 761747bfc5 (3 months ago) • 2024-06-05 22:15:13 +0200
  Engine • revision edd8546116
  Tools • Dart 3.4.3 • DevTools 2.34.3

Expected Behavior:

The blend animations should play smoothly alongside the regular timeline animations when the .value is changed.

Actual Behavior:

The blend animations do not play at all, and there is no visual or console output indicating an error.

I would appreciate any guidance or assistance in resolving this issue. Thank you for your time and support.

[BlockRen]

I've identified the core issue: it seems that while timeline animations work fine immediately after initializing the Rive object, blend animations fail to execute unless called after a delay, eg: 1 second. This suggests that blend animations might still be asynchronously initializing after the Rive object is ready, requiring a delayed invocation.

[HayesGordon]

Hi @BlockRen , it'll be helpful if you can share a .rev/.riv file alongside sample code you're using so that we can investigate this more easily.