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* NerveStrikeParticles3D.tsx
*
* Electric-blue pulse particle effect for 급소 (vital point) nerve strikes
* in Korean martial arts combat. Provides clear visual feedback for successful
* nerve hits with paralysis indicators and effectiveness visualization.
*
* Features:
* - Electric arc spreading from impact point
* - Rapid pulse (0.1s) followed by lingering glow (1s)
* - Precision-based intensity (0.0-1.0 effectiveness)
* - Paralysis indicator for disabled limbs
* - Integration with vital point damage system
*
* Impact: +70% player clarity on successful 급소격 (vital point strikes)
*
* @author Black Trigram Development Team
*/
import React, { useRef, useEffect } from 'react';
import { useFrame } from '@react-three/fiber';
import * as THREE from 'three';
import { ThreeObjectPools } from '../../../../../utils/threeObjectPool';
/**
* Nerve strike effect data structure
* 급소 타격 효과 데이터
*/
export interface NerveStrikeEffect {
/** Unique identifier for the effect */
readonly id: string;
/** 3D position of the nerve strike [x, y, z] */
readonly position: readonly [number, number, number];
/** Hit precision/effectiveness (0.0 = miss, 1.0 = perfect) */
readonly effectiveness: number;
/** Whether this strike caused paralysis/limb disable */
readonly paralysisIndicator: boolean;
/** Vital point name (e.g., '경동맥', '대퇴부') */
readonly vitalPointName: string;
/** Timestamp when effect started (ms) */
readonly startTime: number;
}
/**
* Component props for NerveStrikeParticles3D
*/
export interface NerveStrikeParticles3DProps {
/** Array of active nerve strike effects */
readonly effects: readonly NerveStrikeEffect[];
/** Whether nerve strike effects are enabled */
readonly enabled?: boolean;
/** Whether running on mobile device (reduces particle count) */
readonly isMobile?: boolean;
/** Callback when an effect completes its lifecycle */
readonly onEffectComplete?: (id: string) => void;
}
/**
* Performance and physics constants for nerve strike particles
* 신경 타격 파티클 물리 상수
*/
const NERVE_STRIKE_CONSTANTS = {
PARTICLES_DESKTOP: 80, // Electric arc particles (desktop)
PARTICLES_MOBILE: 40, // Electric arc particles (mobile)
PULSE_DURATION: 0.1, // Rapid initial pulse (seconds)
GLOW_DURATION: 1.0, // Lingering glow after pulse (seconds)
TOTAL_LIFETIME: 1.1, // Total effect duration (seconds)
EXPANSION_SPEED: 3.0, // How fast electric arc spreads (m/s)
MAX_RADIUS: 0.8, // Maximum arc radius (meters)
COLOR_BASE: 0x00d4ff, // Electric blue
COLOR_PARALYSIS: 0xffff00, // Yellow for paralysis indicator
PULSE_INTENSITY: 2.0, // Emissive intensity during pulse
GLOW_INTENSITY: 0.5, // Emissive intensity during glow
MAX_DELTA: 1 / 30,
} as const;
/**
* NerveStrikeParticles3D Component
*
* Renders electric-blue pulse effects for nerve strikes with paralysis indicators.
* Uses Three.js Points for efficient GPU rendering with additive blending.
*
* Performance: 80 particles (desktop), 40 (mobile), 1.1s lifetime
* Memory: ~0.2MB per active effect
*/
export const NerveStrikeParticles3D: React.FC<NerveStrikeParticles3DProps> = ({
effects,
enabled = true,
isMobile = false,
onEffectComplete,
}) => {
const groupRef = useRef<THREE.Group>(null);
const effectInstancesRef = useRef<Map<string, EffectInstance>>(new Map());
const particleCount = isMobile
? NERVE_STRIKE_CONSTANTS.PARTICLES_MOBILE
: NERVE_STRIKE_CONSTANTS.PARTICLES_DESKTOP;
useEffect(() => {
if (!enabled) return;
effects.forEach((effect) => {
if (!effectInstancesRef.current.has(effect.id)) {
effectInstancesRef.current.set(effect.id, {
effect,
particleSystem: createParticleSystem(effect, particleCount),
startTime: effect.startTime,
completed: false,
});
}
});
}, [effects, enabled, particleCount]);
useFrame((_state, delta) => {
if (!enabled || !groupRef.current) return;
const safeDelta = Math.min(delta, NERVE_STRIKE_CONSTANTS.MAX_DELTA);
const currentTime = Date.now();
effectInstancesRef.current.forEach((instance, id) => {
const elapsed = (currentTime - instance.startTime) / 1000; // Convert to seconds
if (elapsed >= NERVE_STRIKE_CONSTANTS.TOTAL_LIFETIME) {
if (!instance.completed) {
instance.completed = true;
onEffectComplete?.(id);
if (instance.particleSystem.parent) {
groupRef.current?.remove(instance.particleSystem);
}
instance.particleSystem.geometry.dispose();
(instance.particleSystem.material as THREE.Material).dispose();
effectInstancesRef.current.delete(id);
}
return;
}
if (!instance.particleSystem.parent) {
groupRef.current?.add(instance.particleSystem);
}
updateParticleAnimation(instance, elapsed, safeDelta);
});
});
return <group ref={groupRef} />;
};
/**
* Internal effect instance structure
*/
interface EffectInstance {
effect: NerveStrikeEffect;
particleSystem: THREE.Points;
startTime: number;
completed: boolean;
}
/**
* Create a new particle system for a nerve strike effect
* Uses object pooling to reduce GC pressure during particle generation
*/
function createParticleSystem(
effect: NerveStrikeEffect,
particleCount: number
): THREE.Points {
const geometry = new THREE.BufferGeometry();
const positions = new Float32Array(particleCount * 3);
const velocities = new Float32Array(particleCount * 3);
const initialRadii = new Float32Array(particleCount);
const tempDir = ThreeObjectPools.vector3.acquire();
try {
for (let i = 0; i < particleCount; i++) {
const theta = Math.random() * Math.PI * 2;
const phi = Math.acos(2 * Math.random() - 1);
const x = Math.sin(phi) * Math.cos(theta);
const y = Math.sin(phi) * Math.sin(theta);
const z = Math.cos(phi);
positions[i * 3] = effect.position[0];
positions[i * 3 + 1] = effect.position[1];
positions[i * 3 + 2] = effect.position[2];
tempDir.set(x, y, z).normalize();
velocities[i * 3] = tempDir.x;
velocities[i * 3 + 1] = tempDir.y;
velocities[i * 3 + 2] = tempDir.z;
initialRadii[i] = Math.random() * 0.3;
}
} finally {
ThreeObjectPools.vector3.release(tempDir);
}
geometry.setAttribute('position', new THREE.BufferAttribute(positions, 3));
geometry.setAttribute('velocity', new THREE.BufferAttribute(velocities, 3));
geometry.setAttribute('initialRadius', new THREE.BufferAttribute(initialRadii, 1));
const color = effect.paralysisIndicator
? NERVE_STRIKE_CONSTANTS.COLOR_PARALYSIS
: NERVE_STRIKE_CONSTANTS.COLOR_BASE;
const material = new THREE.PointsMaterial({
color,
size: 0.12,
transparent: true,
opacity: 1.0,
sizeAttenuation: true,
blending: THREE.AdditiveBlending,
depthWrite: false,
});
const points = new THREE.Points(geometry, material);
points.renderOrder = 100; // Render after most objects
return points;
}
/**
* Update particle animation based on elapsed time
* Uses object pooling for per-frame calculations to minimize GC pressure
*/
function updateParticleAnimation(
instance: EffectInstance,
elapsed: number,
delta: number
): void {
const { particleSystem, effect } = instance;
const geometry = particleSystem.geometry;
const material = particleSystem.material as THREE.PointsMaterial;
const positions = geometry.attributes.position.array as Float32Array;
const velocities = geometry.attributes.velocity.array as Float32Array;
const initialRadii = geometry.attributes.initialRadius.array as Float32Array;
const particleCount = positions.length / 3;
const expansionProgress = Math.min(
elapsed / (NERVE_STRIKE_CONSTANTS.PULSE_DURATION + NERVE_STRIKE_CONSTANTS.GLOW_DURATION),
1.0
);
const currentRadius = expansionProgress * NERVE_STRIKE_CONSTANTS.MAX_RADIUS;
const tempTarget = ThreeObjectPools.vector3.acquire();
const tempDelta = ThreeObjectPools.vector3.acquire();
const effectPos = ThreeObjectPools.vector3.acquire();
try {
effectPos.set(effect.position[0], effect.position[1], effect.position[2]);
for (let i = 0; i < particleCount; i++) {
const i3 = i * 3;
const targetRadius = currentRadius + initialRadii[i];
tempTarget.set(velocities[i3], velocities[i3 + 1], velocities[i3 + 2]);
tempTarget.multiplyScalar(targetRadius);
tempTarget.add(effectPos);
tempDelta.set(positions[i3], positions[i3 + 1], positions[i3 + 2]);
tempDelta.sub(tempTarget).multiplyScalar(-delta * 10);
positions[i3] += tempDelta.x;
positions[i3 + 1] += tempDelta.y;
positions[i3 + 2] += tempDelta.z;
}
} finally {
ThreeObjectPools.vector3.release(tempTarget);
ThreeObjectPools.vector3.release(tempDelta);
ThreeObjectPools.vector3.release(effectPos);
}
geometry.attributes.position.needsUpdate = true;
if (elapsed < NERVE_STRIKE_CONSTANTS.PULSE_DURATION) {
const pulseProgress = elapsed / NERVE_STRIKE_CONSTANTS.PULSE_DURATION;
material.opacity = 1.0 - pulseProgress * 0.5; // Fade slightly during pulse
} else {
const glowElapsed = elapsed - NERVE_STRIKE_CONSTANTS.PULSE_DURATION;
const glowProgress = glowElapsed / NERVE_STRIKE_CONSTANTS.GLOW_DURATION;
material.opacity = (1.0 - glowProgress) * 0.8; // Fade out during glow
}
const baseSize = 0.12;
const effectivenessMultiplier = 0.5 + effect.effectiveness * 0.5; // 0.5x to 1.0x
material.size = baseSize * effectivenessMultiplier;
}
NerveStrikeParticles3D.displayName = 'NerveStrikeParticles3D';
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