Hello. Sorry for the stupid question, but how to do arithmetic operations with vectors as in mono. Perhaps you can somehow expand the list of standard vector methods or something.

```
let vec1: BABYLON.Vector3 = new BABYLON.Vector3(1, 2, 3);
let vec2: BABYLON.Vector3 = new BABYLON.Vector3(3, 2, 1);
let vec3: BABYLON.Vector3 = new BABYLON.Vector3(2, 3, 1);
let result = vec1 * vec2 * vec3 + 1; //mono
let result = vec1.multiply(vec2).multiply(vec3).add(1 /*?*/); //babylon
```