@fluritheme/fluri/dist/physics/packing.js

Interactive snowfall for websites: DOM-aware snow accumulation, mouse interactions, snow physics, Canvas 2D rendering, and Christmas effects.

import { seededRandom } from './math.js';
/** Stable local packing depth: wind-exposed crests and denser hollows have different capacity. */
export function createPackingProfile(length, binSize, seed) {
    const random = seededRandom(seed);
    const salts = [random() * 10000, random() * 10000, random() * 10000];
    const noise = (x, salt) => {
        const i = Math.floor(x), t = x - i, s = t * t * (3 - 2 * t);
        const value = (n) => {
            const q = Math.sin((n + salt) * 127.1) * 43758.5453123;
            return q - Math.floor(q);
        };
        return value(i) * (1 - s) + value(i + 1) * s;
    };
    return Float32Array.from({ length }, (_, index) => {
        const x = (index + 0.5) * binSize;
        return (0.32 +
            0.48 * noise(x / 76, salts[0] ?? 0) +
            0.13 * noise(x / 24, salts[1] ?? 0) +
            0.07 * noise(x / 8, salts[2] ?? 0));
    });
}
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