text: 
  import { Point } from "./Point.model";
  import { Direction } from "./Direction.model";
  
  export const Setup = function(
      centre = new Point(0, 0, 0),
      direction = new Direction(),
      aperture = 30
  ){
      this.centre = centre;
      this.direction = direction;
      this.aperture = aperture;
  }
  