# Building a tube from array when returning to former point won't render the tube
**URL:** https://forum.babylonjs.com/t/building-a-tube-from-array-when-returning-to-former-point-wont-render-the-tube/1152
**Category:** Questions
**Created:** [February 3, 2019, 4:21am UTC](https://forum.babylonjs.com/t/building-a-tube-from-array-when-returning-to-former-point-wont-render-the-tube/1152 "2019-02-03T04:21:15Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@rgalindox](https://forum.babylonjs.com/u/rgalindox)
#### Post date: [February 3, 2019, 4:21am UTC](https://forum.babylonjs.com/t/building-a-tube-from-array-when-returning-to-former-point-wont-render-the-tube/1152/1 "2019-02-03T04:21:15Z")
HI,
I’m creating a tube dynamically based on points from an array that is calculated on the fly finding a route, in some cases the point is repeated and the tube will return to a prior point as it finds a blocker, when this happens, the tube is not rendered after that point.
This is an example of an array that causes the behaviour, position 0 and 3 are repeated:
```
var myPathTmp = [];
myPathTmp[0] = new BABYLON.Vector3(2.273655652999878, 0.5, 1.9416018724441528);
myPathTmp[1] = new BABYLON.Vector3(2.680851459503174, 0.5, 2.4170844554901123);
myPathTmp[2] = new BABYLON.Vector3(2.273655652999878, 0.5, 1.9416018724441528);
myPathTmp[3] = new BABYLON.Vector3(2.1215269565582275, 0.5, 2.6639657020568848);
```
tube = BABYLON.MeshBuilder.CreateTube(“tube”, {path: myPathTmp, radius: 0.02, sideOrientation: BABYLON.Mesh.DOUBLESIDE, updatable: true}, scene);
tube.material = myMaterial;
This code won’t render the tube from array position 2 to 3.
If I remove the point myPathTmp[2]:
var myPathTmp = [];
myPathTmp[0] = new BABYLON.Vector3(2.273655652999878, 0.5, 1.9416018724441528);
myPathTmp[1] = new BABYLON.Vector3(2.680851459503174, 0.5, 2.4170844554901123);
myPathTmp[2] = new BABYLON.Vector3(2.1215269565582275, 0.5, 2.6639657020568848);
It renders the tube correctly. In this case Vector3 on position 1 is not repeated.
In my case the array is dynamically generated as it is finding a route.
Do you think this is a bug or a setting on the CreateTube that I need to set?
Thanks for your valuable help.
---
### Author:  [@jerome](https://forum.babylonjs.com/u/jerome)
#### Post date: [February 3, 2019, 7:44am UTC](https://forum.babylonjs.com/t/building-a-tube-from-array-when-returning-to-former-point-wont-render-the-tube/1152/2 "2019-02-03T07:44:54Z")
The tube geometry is built upon the mathemical object Path3D : [Path3D - Babylon.js Documentation](https://doc.babylonjs.com/api/classes/babylon.path3d)
example : [Use Path3D - Babylon.js Documentation](https://doc.babylonjs.com/how_to/how_to_use_path3d)
[Display Path3D Curve - Babylon.js Documentation](https://doc.babylonjs.com/snippets/path3d)
It’s probably not surprising that getting back on your path will generate some weird things in your tube…
---
### Author:  [@rgalindox](https://forum.babylonjs.com/u/rgalindox)
#### Post date: [February 4, 2019, 4:20pm UTC](https://forum.babylonjs.com/t/building-a-tube-from-array-when-returning-to-former-point-wont-render-the-tube/1152/3 "2019-02-04T16:20:21Z")
Thanks for the reply. If I use the line it renders it correctly. But line doesn’t have width parameter ☹