Method constructor

docs/app/js/sanddance-app.js:75598–75602

(x = 0, y = 0, z = 0, order = Euler.DefaultOrder)

        return 4;
    }
    constructor(x = 0, y = 0, z = 0, order = Euler.DefaultOrder){
        super(-0, -0, -0, -0);
        if (arguments.length > 0 && Array.isArray(arguments[0])) this.fromVector3(...arguments);
        else this.set(x, y, z, order);
    }
    fromQuaternion(quaternion) {
        const [x, y, z, w] = quaternion;
        const ysqr = y * y;