Method multiplyLeft

docs/app/js/sanddance-app.js:74784–74787

(a)

        return this.check();
    }
    multiplyLeft(a) {
        _quat.multiply(this, a, this);
        return this.check();
    }
    normalize() {
        const length = this.len();
        const l = length > 0 ? 1 / length : 0;