Using ImportMesh with a String

[Cole Watson]

Hi Everyone! I am new to Babylon and had a question about the ImportMesh function of the SceneLoader.

For my use case I am downloading obj files from and endpoint using our custom headers before making the ImportMesh call. When we download the OBJ files we get a string containing everything in that OBJ file. I am aware that in the sceneFilename parameter we are able to pass in the "stringified" version of the obj file. But I cant seem to get it to work. I get the error: 

core.umd.js:1487 ERROR Error: Uncaught (in promise): TypeError: First argument to DataView constructor must be an ArrayBuffer
TypeError: First argument to DataView constructor must be an ArrayBuffer
    at new DataView (<anonymous>)
    at r.isBinary (babylonjs.loaders.min.js:1)
    at r.importMesh (babylonjs.loaders.min.js:1)
    at babylon.js:35
    at m (babylon.js:35)
    at Function.i._loadData (babylon.js:35)
    at Function.i.ImportMesh (babylon.js:35)

Here is an example of the call being made:

BABYLON.SceneLoader.ImportMesh(
   'Some_Name',
   '',
   'Data: string version of obj file...',
   scene,
   this.onSuccess,
   this.onProgress,
   this.onError,
   '.stl'
);

If anyone has any idea of what I am doing wrong here that would be hugely helpful! 

[Guest]

Hello and welcome

I'm seeing .stl in the extension. Is that expected?

[Cole Watson]

I have tried .obj and .stl to no avail... 

[Guest]

Can you repro the issue in the PG then?

Your code looks good but I would like to test it 

[Dad72]

try this :

BABYLON.SceneLoader.ImportMesh(
   '',
   '',
   'Data: string version of obj file...',
   scene,
   this.onSuccess,
   this.onProgress,
   this.onError,
   '.stl'
);

When we add a name it creates problems every time.

I do not find this parameter very useful.

[Cole Watson]

I am able to get the obj loaded when using the .Append function but not using the Import Mesh function

 

https://playground.babylonjs.com/#5336A5#3

[Cole Watson]

@Dad72 removing the name worked for me! Thanks! Not sure why that is but it got it all working well.

 

https://playground.babylonjs.com/#5336A5#5

[Guest]

name is the name of the mesh to import from the datasource. Not providing it means that you will import all meshes

[Dad72]

ImportMesh () is good for importing a single mesh. If there are more you have to use Append () how can ImportMesh import several meshes?

I noticed that for the name in ImportMesh if we do not give the correct name existing in the file, it creates a bug.

I still do not understand the utility of the name in ImportMesh that is made to import a mesh. Append () is to import more than one.

The name ImportMesh very regularly misleads users who enter a different name from the one existing in the file.

[Guest]

The preoperty name is meshNames which literally means you can only import a single mesh (or many of them but not all) from a scene file.

If you want to import all of the scene, just use AppendScene

[Dad72]

Ok, i see.

[RaananW]

Hi @Cole Watson, I just pushed a fix for STLs too. it will probably take a bit of time until it will be available in the pplayground.

[Guest]

Should be available by tonight (PST)