The metal map didn't show up , when I exported GLB from Unity and previewed it on the gltf-viewer

Questions
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1

The metal map didn’t show up , when I exported GLB from Unity and previewed it on the gltf-viewer

I use the plugin export glb from unity , GitHub - BabylonJS/UnityExporter: Home of the community maintained Unity exporter for Babylon.js .
The GLB export function is not available until version 2020 or later in this plugin .
This is the plugin usage doc Unity2020里GLTF插件的安装和使用 | PxSite

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This is the unity project file :

This is the glb :

This is the gltf preview website :
https://gltf-viewer.donmccurdy.com/

2

Not sure if it can be set in the Babylonjs exporter, but instead of exporting the PBR maps as separate B&W channels, try exporting them as a single texture (MeshStandardMaterial splits the channels for you.)

How it is currently in your .glb file:

babylonjs
babylonjs694×219 35.8 KB

How it should be to work with three:

three
three700×241 34.6 KB

3

you said makes sense,
I brought this phenomenon to the bbl plugin side .
wait for the result of the reply there .