Learn ShapeJS

function main(args) {
	
	var w =30*MM; // scene size
        var a = 5*MM; // period of wrap 
  	var r = 1*MM;

	var s1 = new Cylinder(new Vector3d(a/2, -a/2, 0), new Vector3d(a/2, 3*a/2, 0), r);
	var s2 = new Cylinder(new Vector3d(-a/2, a/2, 0), new Vector3d(3*a/2, a/2, 0), r);
        var pw = new PeriodicWrap(new Vector3d(a,0,0),new Vector3d(0,a,0));  
	var grid = new Union(s1, s2);
        grid.setTransform(pw);
        var croppedGrid = new Intersection(grid, new Sphere(0,0,0,w-r));
        var shape = new Union(croppedGrid, new Torus(w-r, r));
    
	return new Scene(shape,new Bounds(-w,w,-w,w,-w,w));
}