Vector3 function in reactive style for Spark AR.

Vector3.js

function Vector3(x, y, z) {
    this.x = x;
    this.y = y;
    this.z = z;

    this.mul = function (multiplier) {
        return new Vector3(this.x.mul(multiplier), this.y.mul(multiplier), this.z.mul(multiplier));
    };
    this.scale = function (anotherVector3) {
        return new Vector3(this.x.mul(anotherVector3.x), this.y.mul(anotherVector3.y), this.z.mul(anotherVector3.z));
    }
    this.add = function (anotherVector3) {
        return new Vector3(this.x.add(anotherVector3.x), this.y.add(anotherVector3.y), this.z.add(anotherVector3.z));
    }
    this.dot = function (anotherVector3) {
        return this.x.mul(anotherVector3.x).add(this.y.mul(anotherVector3.y)).add(this.z.mul(anotherVector3.z));
    }
    this.sub = function (anotherVector3) {
        return new Vector3(this.x.sub(anotherVector3.x), this.y.sub(anotherVector3.y), this.z.sub(anotherVector3.z));
    }
    return this;
}