Using glTF extensions question

[freetoplay]

I want to load a file with the draco compression extension, I am doing something like this:

BABYLON.SceneLoader.Append("https://rawgit.com/KhronosGroup/glTF-Sample-Models/master/2.0/Duck/glTF-Draco/", "Duck.gltf", scene, function (scene) {
// do something
}

This works fine, but how do I know if the draco compression extension has been applied? The reason I am asking is the documentation for "append" accepts a parameter called pluginExtension, so I am not sure if I need to explicitly pass in the extension or it's done automatically.

[brianzinn]

The draco compression extension is used automatically, if you have a v2 model. The loader v1 or v2 is chosen based on the file version:
https://doc.babylonjs.com/how_to/gltf#full-version

You can read more about the decoder here:
https://doc.babylonjs.com/api/classes/babylon.dracocompression

Use BABYLON.DracoCompression.DecoderAvailable to determine if the decoder is available for the current session.

 

16 minutes ago, freetoplay said:

The reason I am asking is the documentation for "append" accepts a parameter called pluginExtension

I think that's only if you want to override, because an appropriate loader will be used based on the file extension. ie: you can force a gltf loader on a file missing an extension:

https://github.com/BabylonJS/Babylon.js/blob/master/src/Loading/babylon.sceneLoader.ts#L251

[Sebavan]

Thanks @brianzinn for the answer. Adding @bghgary to the thread if it requires more details.