Function lerp

docs/app/js/sanddance-app.js:69465–69468

(a, b, t)

    return map(value1, (value)=>Math.max(min, Math.min(max, value)));
}
function lerp(a, b, t) {
    if (isArray(a)) return a.map((ai, i)=>lerp(ai, b[i], t));
    return t * b + (1 - t) * a;
}
function equals(a, b, epsilon) {
    const oldEpsilon = config.EPSILON;
    if (epsilon) config.EPSILON = epsilon;