Bevy 0.19 — Animation (graphs, blending, events, 12 principles)

When to use this skill

• Loading a glTF clip and playing it on a character: AnimationPlayer + AnimationGraphHandle.
• Cross-fading between idle / walk / run via AnimationTransitions::play(player, node, Duration).
• Building an AnimationGraph in code: blend nodes, additive nodes, weights, AnimationMask.
• Triggering gameplay events from a clip timeline (footsteps, hitbox activation, VFX cues) with #[derive(AnimationEvent)] + clip.add_event_to_target(...) + On<MyEvent> observers.
• Procedural tweening without an AnimationClip — sampling a Curve per frame via EasingCurve + EaseFunction or CubicSegment::new_bezier_easing.
• Applying the 12 Basic Principles of Animation (Thomas & Johnston, 1981) to a Bevy character.
• Importing a Blender rig and finding bones aren't animated — usually the Name requirement for AnimationTargetId::from_name.

Canonical end-to-end pattern

Verified against bevy = "0.19" — cargo check clean in bevy-skills-tester/skill-snippets/examples/bevy_animation.rs.