Method distance

docs/app/js/sanddance-app.js:69168–69170

(mathArray)

        return this.lengthSquared();
    }
    distance(mathArray) {
        return Math.sqrt(this.distanceSquared(mathArray));
    }
    distanceSquared(mathArray) {
        let length = 0;
        for(let i = 0; i < this.ELEMENTS; ++i){