Tube won't update

Questions
1

I’m trying to create a path to a given location using a set of points using an updateable tube. I’m creating the tube skeleton in the createScene function like this:

        const myPath = [
            new BABYLON.Vector3(5.0, 0, 0.0),
            new BABYLON.Vector3(0, 1, 0.1),
            new BABYLON.Vector3(-4.0, 6, 0.2)
        ];

        tube = BABYLON.MeshBuilder.CreateTube("tube", {
            path: myPath,
            radius: 0.5,
            sideOrientation: BABYLON.Mesh.DOUBLESIDE,
            updatable: true,
            cap: 3,
        }, scene);

and then trying to update in a jquery event call late on like this:

            tube = BABYLON.MeshBuilder.CreateTube("tube", {
                path: testPoints,
                instance: tube,
            });

But it is now giving me an error saying that babylon.js:16 Uncaught TypeError: Cannot set property ‘x’ of undefined.

I’m sure I’m doing something stupid but I can’t seem to figure it out. Any help would be greatly appreciated.

2

It does work here, so you will need to provide your own PG for us to be able to help.

One guess: tube you pass to the property instance is undefined. Try console.log(tube); before the call.

2 Likes
3

https://playground.babylonjs.com/#CIQ9IX#1

Try this one. I tried just changing position.x of tube in place of the rebuild earlier and that worked fine so I can’t see how tube could be undefined. I also tried using both testPoints and routeCurve.getPoints(). Both gave the same error.

4

You can’t change the number of elements of the path array, only the values.

See doc:

All the parametric shapes, except for the CreateLathe, CreatePolygon and ExtrudePolygon have an *instance* property in the options. This is used to update the shape after creation provided its *updatable* options property was set to *true* . You can only change values in the shape defining data arrays not the size of the arrays.

3 Likes
5

Ah! I missed that in the docs. Thanks.

Would it better then to create and destroy a tube everytime I need change it or rather just to create all the tubes I’d need at the start?

6

If you have a fixed number of tubes then creating them from start will yield the best results.

7

Awesome. Thanks so much for the help!

8

I made an example of how I “update” the tube path. basically it’s removing the current pipe and creating another one with the updated path.

  • Does anyone have a better way to achieve the same result?
  • Why tube can’t have something like tube.path(newPath) ?

#questions #snake