jscad speaker

antiresonant_speaker.js

const len = 100; // length of longest resonator
const count = 8;
const irr = (Math.sqrt(5) + 1) / 2; // a very irrational number
const s = 1 / irr; // length ratio between largest and smallest resonator

function main() {
    return Array(count).fill(0)
        .map((_, i) => resonator(Math.pow(s, i / (count - 1))))
        .reduce(combine);
}

function resonator(length) {
    return cube({
        center: [1, 1, 0]
    }).scale([length, 0.06, 0.005])
      .scale(len)
}

function combine(a, b) {
    return union(
        a.rotateZ(180 / count)
         .translate([0, 0, 0.01 * len]),
        cylinder({
            r: 0.06 * len / 2,
            start: [0, 0, 0.01 * len],
            end: [0, 0, 0.005 * len]
        }),
        b
    )
}