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VA Animation Logic

The Animation Logic system provides a Blueprint-based framework for controlling vertex animation behavior. It allows you to create custom logic classes that define how animations play, transition, and respond to events.

Overview

Animation Logic classes work with VA Animation Lists to control animation playback. Each Animation Logic class defines:

  • How animations start and stop
  • When and how animations transition
  • How animations respond to events
  • Custom behavior for specific use cases

Creating Custom Logic

  1. In the Content Browser, right-click and select Blueprint Class
  2. Select "VAAnimationListLogic" as the parent class
  3. Name your Blueprint (e.g., "BP_IdleWalkLogic")
  4. Open the Blueprint and implement the desired behavior using the provided events

Creating Logic

Blueprint Events

Begin Instances

Called when instances are first registered with the animation system. 

Event Begin Instances
└── Play Animation
    ├── Instance ID
    ├── Animation Index
    └── Looping = true

End Instances

Called when instances are removed from the animation system. 

Event End Instances
└── Stop Animation
    └── Instance ID

Update Instances

Called every frame for active instances, allowing for continuous logic. 

Event Update Instances
└── [Your update logic]

Animation Completed

Called when an animation finishes playing. 

Event Animation Completed
└── [Handle completion]

Custom Events

Custom events can be defined and triggered for specific animation needs. 

Event On Custom Animation Event
└── [Handle event]

Common Logic Patterns

State-Based Logic

Control animations based on character state (idle, walking, running, etc.).

Idle Walk Logic

Begin Instances
└── Play Idle

Update Instances
├── Get Speed
└── Branch
    ├── Speed > 0
    │   └── Play Walk
    └── Play Idle

Sequential Logic

Play animations in sequence, useful for multi-part animations. 

Begin Instances
└── Play First Animation

Animation Completed
└── Play Next Animation in Sequence

Random Playback

Randomly select animations from a pool for variety. 

Begin Instances
└── Play Random Animation

Animation Completed
├── Random Delay
└── Play Next Random Animation

Environmental Logic

Control animations based on environmental factors. 

Update Instances
├── Get Wind Speed
└── Set Animation Play Rate

Tips & Best Practices

  • Keep logic modular and reusable
  • Use variables to store state information
  • Leverage the instance ID to manage multiple characters
  • Consider performance when implementing Update Instances logic
  • Use custom events for specialized behavior

See Also