86 lines
2.3 KiB
JavaScript
86 lines
2.3 KiB
JavaScript
import * as THREE from 'three';
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let rainParticles;
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let rainPositions;
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let rainVelocities;
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const RAIN_COUNT = 2000;
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export function initEffects(scene) {
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initMatrixRain(scene);
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initStarfield(scene);
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}
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function initMatrixRain(scene) {
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const geo = new THREE.BufferGeometry();
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const positions = new Float32Array(RAIN_COUNT * 3);
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const velocities = new Float32Array(RAIN_COUNT);
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const colors = new Float32Array(RAIN_COUNT * 3);
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for (let i = 0; i < RAIN_COUNT; i++) {
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positions[i * 3] = (Math.random() - 0.5) * 100;
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positions[i * 3 + 1] = Math.random() * 50 + 5;
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positions[i * 3 + 2] = (Math.random() - 0.5) * 100;
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velocities[i] = 0.05 + Math.random() * 0.15;
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const brightness = 0.3 + Math.random() * 0.7;
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colors[i * 3] = 0;
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colors[i * 3 + 1] = brightness;
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colors[i * 3 + 2] = 0;
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}
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geo.setAttribute('position', new THREE.BufferAttribute(positions, 3));
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geo.setAttribute('color', new THREE.BufferAttribute(colors, 3));
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rainPositions = positions;
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rainVelocities = velocities;
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const mat = new THREE.PointsMaterial({
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size: 0.12,
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vertexColors: true,
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transparent: true,
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opacity: 0.7,
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sizeAttenuation: true,
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});
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rainParticles = new THREE.Points(geo, mat);
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scene.add(rainParticles);
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}
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function initStarfield(scene) {
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const count = 500;
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const geo = new THREE.BufferGeometry();
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const positions = new Float32Array(count * 3);
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for (let i = 0; i < count; i++) {
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positions[i * 3] = (Math.random() - 0.5) * 300;
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positions[i * 3 + 1] = Math.random() * 80 + 10;
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positions[i * 3 + 2] = (Math.random() - 0.5) * 300;
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}
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geo.setAttribute('position', new THREE.BufferAttribute(positions, 3));
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const mat = new THREE.PointsMaterial({
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color: 0x003300,
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size: 0.08,
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transparent: true,
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opacity: 0.5,
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});
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const stars = new THREE.Points(geo, mat);
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scene.add(stars);
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}
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export function updateEffects(_time) {
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if (!rainParticles) return;
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for (let i = 0; i < RAIN_COUNT; i++) {
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rainPositions[i * 3 + 1] -= rainVelocities[i];
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if (rainPositions[i * 3 + 1] < -1) {
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rainPositions[i * 3 + 1] = 40 + Math.random() * 20;
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rainPositions[i * 3] = (Math.random() - 0.5) * 100;
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rainPositions[i * 3 + 2] = (Math.random() - 0.5) * 100;
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}
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}
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rainParticles.geometry.attributes.position.needsUpdate = true;
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}
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