Method negate

docs/app/js/sanddance-app.js:69299–69302

()

        return true;
    }
    negate() {
        for(let i = 0; i < this.ELEMENTS; ++i)this[i] = -this[i];
        return this.check();
    }
    lerp(a, b, t) {
        if (t === undefined) return this.lerp(this, a, b);
        for(let i = 0; i < this.ELEMENTS; ++i){