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* Camera shake utilities for explosive impact feedback
*
* Provides camera shake effects for Jin (Thunder) trigram techniques
* with configurable intensity and duration.
*
* **Korean Martial Arts Context:**
* - 진괘 (Jin): Thunder trigram impact visualization
* - 카메라 진동 (Camera Shake): Visual impact feedback
* - 충격 효과 (Impact Effect): Explosive force sensation
*
* @module utils/cameraShake
* @korean 카메라진동
*/
import { useRef, useCallback } from "react";
import * as THREE from "three";
/**
* Camera shake configuration
*/
export interface CameraShakeConfig {
/** Shake intensity (0-1) */
readonly intensity: number;
/** Duration in milliseconds */
readonly duration: number;
/** Frequency of shake oscillation (Hz) */
readonly frequency?: number;
/** Decay rate (0-1, higher = faster decay) */
readonly decay?: number;
}
/**
* Camera shake state
*/
interface CameraShakeState {
active: boolean;
startTime: number;
duration: number;
intensity: number;
frequency: number;
decay: number;
originalPosition: THREE.Vector3;
offset: THREE.Vector3;
}
/**
* Camera shake manager for Three.js cameras
*/
export class CameraShakeManager {
private shakeState: CameraShakeState | null = null;
private camera: THREE.Camera | null = null;
private tempVector: THREE.Vector3 | null = null;
/**
* Attach the shake manager to a camera
*/
attachCamera(camera: THREE.Camera): void {
this.camera = camera;
}
/**
* Detach from current camera
*/
detachCamera(): void {
Iif (this.camera && this.shakeState) {
// Reset camera to original position
this.camera.position.copy(this.shakeState.originalPosition);
}
this.camera = null;
this.shakeState = null;
}
/**
* Trigger a camera shake effect
*/
shake(config: CameraShakeConfig): void {
if (!this.camera) {
console.warn("CameraShakeManager: No camera attached");
return;
}
// Capture current position only when starting a new shake (not already active)
// This prevents snapping to old position if camera moved between shakes
const originalPosition =
this.shakeState?.active === true
? this.shakeState.originalPosition
: this.camera.position.clone();
this.shakeState = {
active: true,
startTime: Date.now(),
duration: config.duration,
intensity: config.intensity,
frequency: config.frequency ?? 15,
decay: config.decay ?? 0.95,
originalPosition,
offset: new THREE.Vector3(),
};
}
/**
* Update camera shake (call in animation loop)
*/
update(): void {
if (!this.camera || !this.shakeState?.active) {
return;
}
const elapsed = Date.now() - this.shakeState.startTime;
const progress = elapsed / this.shakeState.duration;
if (progress >= 1) {
// Shake complete - reset camera
this.camera.position.copy(this.shakeState.originalPosition);
this.shakeState.active = false;
return;
}
// Calculate decay factor with configured decay rate
const configuredDecay = this.shakeState.decay;
const decayFactor =
Math.pow(1 - progress, 2) * Math.exp(-configuredDecay * progress);
// Calculate shake offset with oscillation
const time = elapsed / 1000; // Convert to seconds
const frequency = this.shakeState.frequency;
const amplitude = this.shakeState.intensity * decayFactor;
// Use different frequencies for each axis for more natural shake
this.shakeState.offset.x =
Math.sin(time * frequency * 2 * Math.PI) * amplitude * 0.1;
this.shakeState.offset.y =
Math.sin(time * frequency * 1.7 * Math.PI) * amplitude * 0.1;
this.shakeState.offset.z =
Math.sin(time * frequency * 2.3 * Math.PI) * amplitude * 0.05;
// Apply offset to camera - reuse temp vector to avoid GC pressure
this.tempVector ??= new THREE.Vector3();
this.tempVector.copy(this.shakeState.originalPosition).add(this.shakeState.offset);
this.camera.position.copy(this.tempVector);
}
/**
* Check if shake is currently active
*/
isShaking(): boolean {
return this.shakeState?.active ?? false;
}
/**
* Stop current shake immediately
*/
stop(): void {
Eif (this.camera && this.shakeState) {
this.camera.position.copy(this.shakeState.originalPosition);
this.shakeState.active = false;
}
}
}
/**
* Predefined shake profiles for Jin techniques
*/
export const JIN_SHAKE_PROFILES = {
/** Light shake for quick strikes */
light: {
intensity: 0.3,
duration: 200,
frequency: 20,
decay: 0.95,
},
/** Medium shake for standard impacts */
medium: {
intensity: 0.5,
duration: 300,
frequency: 15,
decay: 0.92,
},
/** Heavy shake for powerful techniques */
heavy: {
intensity: 0.7,
duration: 400,
frequency: 12,
decay: 0.9,
},
/** Explosive shake for maximum impact */
explosive: {
intensity: 1.0,
duration: 500,
frequency: 10,
decay: 0.88,
},
} as const;
/**
* React hook for camera shake in @react-three/fiber
*/
export const useCameraShake = () => {
const managerRef = useRef<CameraShakeManager>(new CameraShakeManager());
const manager = managerRef.current;
const shake = useCallback(
(config: CameraShakeConfig) => manager.shake(config),
[manager]
);
const shakeProfile = useCallback(
(profile: keyof typeof JIN_SHAKE_PROFILES) =>
manager.shake(JIN_SHAKE_PROFILES[profile]),
[manager]
);
const getManager = useCallback(() => manager, [manager]);
return {
/**
* Trigger camera shake with configuration
*/
shake,
/**
* Trigger camera shake using predefined profile
*/
shakeProfile,
/**
* Get the shake manager instance
*/
getManager,
};
};
/**
* Calculate shake intensity from Jin technique properties
*/
export const calculateJinShakeIntensity = (
techniqueIntensity: number,
explosivePower: number
): number => {
return Math.min(1.0, techniqueIntensity * explosivePower * 0.7);
};
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