If you are using PBR Materials, they depend on the IBL lighting to properly work, otherwise they appear as black (as it has nothing to reflect)
Try adding hdr lighting to the scene
Alternatively you can use something like following
material.metallic = 0;
material.roughness = 1;
…which should give you some better result without HDR lighting, but it’s not exactly the perfect usage of the PBR Material.
Basically the soul of PBRMaterials is HDR lighting and you should utilize it to get realistic results. Otherwise there is no point in using it, and you can switch to StandardMaterial instead.