Agent skill

Game Feel & Polish

Use this skill for "game feel", "juice", "polish", "screen shake", "hit pause", "hitstop", "particles", "impact", "feedback", "responsiveness", making gameplay feel satisfying. **Load references when:** - Advanced techniques → `references/advanced-techniques.md` All code MUST be deterministic for rollback netcode compatibility.

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npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/game-feel

SKILL.md

Game Feel & Polish for Nethercore ZX

Game feel ("juice") transforms functional mechanics into satisfying experiences. All code MUST be deterministic for rollback netcode.

Core Principles

Principle Implementation
Exaggeration Screen shake, scale bounces, speed lines
Anticipation Wind-up animations, audio cues before action
Follow-through Lingering effects after action ends
Immediate feedback Visual + audio response within 1-2 frames

Screen Shake

rust
struct ScreenShake {
    intensity: f32,
    duration: u32,
    remaining: u32,
}

impl ScreenShake {
    fn trigger(&mut self, intensity: f32, duration: u32) {
        self.intensity = intensity;
        self.duration = duration;
        self.remaining = duration;
    }

    fn update(&mut self) -> (f32, f32) {
        if self.remaining == 0 { return (0.0, 0.0); }

        let t = self.remaining as f32 / self.duration as f32;
        let current = self.intensity * t;
        let offset_x = (random() * 2.0 - 1.0) * current;
        let offset_y = (random() * 2.0 - 1.0) * current;

        self.remaining -= 1;
        (offset_x, offset_y)
    }
}

Shake Intensity Guide

Event Intensity Duration
Light hit 2-4 px 4-6 ticks
Heavy hit 6-10 px 8-12 ticks
Explosion 12-20 px 15-25 ticks
Boss attack 15-25 px 20-30 ticks

Hit Pause (Freeze Frames)

Momentary freeze on impact adds weight:

rust
struct HitPause { remaining: u32 }

impl HitPause {
    fn trigger(&mut self, frames: u32) {
        self.remaining = self.remaining.max(frames);
    }

    fn is_paused(&self) -> bool { self.remaining > 0 }

    fn update(&mut self) {
        if self.remaining > 0 { self.remaining -= 1; }
    }
}

fn update(game: &mut Game) {
    game.hit_pause.update();
    if game.hit_pause.is_paused() { return; }  // Skip gameplay
    // Normal update...
}

Hit Pause Guide

Event Duration
Light hit 2-3 frames
Heavy hit 4-6 frames
Critical 8-10 frames
Boss stagger 12-15 frames

Visual Feedback

Flash on Hit

rust
fn render_entity(e: &Entity) {
    if e.flash_timer > 0 {
        material_emissive(0xFFFFFFFF);  // White flash
    }
    draw_mesh(e.mesh);
    material_emissive(0x000000FF);  // Reset
}

Scale Bounce

rust
fn update_bounce(scale: &mut f32, target: f32, velocity: &mut f32) {
    let diff = target - *scale;
    *velocity += diff * 0.3;  // Spring force
    *velocity *= 0.8;  // Damping
    *scale += *velocity;
}

Audio Feedback

Event Sound Type Timing
Button press UI click Immediate
Jump Whoosh On input
Land Thud On contact
Hit Impact + voice On collision
rust
fn on_hit(damage: i32) {
    play_sound(SOUND_HIT);
    if damage > 20 {
        play_sound(SOUND_HEAVY_HIT);
    }
}

Particle Hints

For particle effects (dust, sparks, debris):

rust
// Spawn burst on landing
if just_landed {
    for _ in 0..5 {
        spawn_particle(Particle {
            pos: player_pos,
            vel: (random() * 2.0 - 1.0, random() * 0.5),
            life: 15,
            color: 0x888888FF,
        });
    }
}

Quick Checklist

  • Screen shake on impacts
  • Hit pause on heavy attacks
  • Visual flash on damage
  • Audio for all interactions
  • Particles for contacts
  • Anticipation before big moves
  • Follow-through after actions

References

  • references/advanced-techniques.md - Complex effects, camera tricks

Related Skills

  • zx-dev/rendering-techniques - Visual effects implementation
  • procedural-sounds - Sound effect generation

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