Objects with more than one material do not render

[alexmotz]

Hi,

I'm trying to import the following model into ThreeJS using ObjectLoader:

    var loader = new THREE.ObjectLoader();
    loader.load("/model/starwars-millennium-falcon.json", (obj)=> {
      this.scene.add( obj );
    });

The geometry imports with no problem. As does any object with a single material. However, any object that has multiple materials seems to fail and render in a random color.

I see a handful of threads here mentioning the same issue, but I don't see a clear resolution.

Any ideas? Thanks in advance.