game-development

Game Development Animation

Apply Disney's 12 animation principles to game engines, player feedback, and interactive entertainment.

Quick Reference

Principle	Game Implementation
Squash & Stretch	Character deformation, impact frames
Anticipation	Wind-up animations, charge indicators
Staging	Camera focus, environmental cues
Straight Ahead / Pose to Pose	Procedural vs keyframed animation
Follow Through / Overlapping	Capes, hair, weapon trails
Slow In / Slow Out	Animation curves, attack/recovery
Arc	Projectile paths, jump trajectories
Secondary Action	Particles, screen shake, audio sync
Timing	Frame data, hit-stop, response windows
Exaggeration	Stylized movement, hit reactions
Solid Drawing	Consistent silhouettes, read at distance
Appeal	Character personality, satisfying feedback

Principle Applications

Squash & Stretch: Deform characters on landing impact. Stretch during fast movement. Impact frames freeze and squash for power. Keep volume consistent in deformation.

Anticipation: Attack wind-ups telegraph to players. Jump squats before leaving ground. Charge attacks show buildup. Enemy tells warn of incoming damage.

Staging: Camera frames important action. Environmental lighting guides attention. Enemy placement creates readable combat scenarios. UI doesn't obscure critical gameplay.

Straight Ahead vs Pose to Pose: Procedural animation (ragdoll, physics) is straight ahead. Keyframed attack combos are pose to pose. Blend both—keyframed base with procedural secondary motion.

Follow Through & Overlapping: Secondary elements (hair, cloth, tails) continue after body stops. Weapon trails persist after swing. Landing recovery extends past initial impact.

Slow In / Slow Out: Use animation curves—never linear for character motion. Attack startup fast-out, recovery slow-in. Ease jumps at apex for floatiness control.

Arc: Jumping follows parabolic arc. Sword swings trace curved paths. Projectiles arc naturally unless hitscan. Dodge rolls curve rather than linear translate.

Secondary Action: Screen shake on impact. Particle bursts on hits. Controller rumble synced to action. Sound design reinforces visual timing.

Timing: Hit-stop (freeze frames) emphasizes impact—2-5 frames typical. Attack startup/active/recovery frame data matters for game feel. Response to input under 100ms.

Exaggeration: Game animation reads at distance and speed. Exaggerate poses 20-30% beyond realistic. Hit reactions more dramatic than physics would suggest. Stylization serves clarity.

Solid Drawing: Silhouettes must read at all zoom levels. Consistent character proportions across animations. Strong poses at keyframes. Avoid tangent lines that confuse form.

Appeal: Characters have personality in idle animations. Movement feels satisfying independent of mechanics. Players should enjoy watching their character move.

Engine Patterns

Unity

// Squash and stretch on landing
IEnumerator LandingSquash() {
    transform.localScale = new Vector3(1.2f, 0.8f, 1.2f);
    yield return new WaitForSeconds(0.05f);
    // Ease back to normal
    float t = 0;
    while (t < 1) {
        t += Time.deltaTime * 8f;
        transform.localScale = Vector3.Lerp(
            new Vector3(1.2f, 0.8f, 1.2f),
            Vector3.one,
            EaseOutElastic(t));
        yield return null;
    }
}

// Hit-stop for impact
IEnumerator HitStop(int frames) {
    Time.timeScale = 0f;
    for (int i = 0; i < frames; i++)
        yield return null;
    Time.timeScale = 1f;
}

Unreal

// Animation curve for easing
UPROPERTY(EditAnywhere)
UCurveFloat* JumpArcCurve;

// Apply curve to movement
float CurveValue = JumpArcCurve->GetFloatValue(NormalizedTime);

Timing Reference

Action Type	Startup	Active	Recovery
Light attack	3-6f	2-4f	8-12f
Heavy attack	12-20f	4-8f	16-24f
Jump	3-4f	--	4-6f
Dodge	2-4f	8-12f	6-10f

Frame data at 60fps. Adjust for target framerate.