I added texture to my model in blender and it renders perfectly there, As soon as I put it in my babylon scene the texture doesn’t have any roughness or normal map. I have uploaded the comparision images from blender and from my scene.
the below image image is from blender
the below image is from babylon scene
It is the gltf exporter of blender that don’t support exporting these textures(If you are using blender 2.93). You can try to write a blender addon to export these textures(I remeber there is one in the blender gltf exporter PR), or load the textures in BJS, and maybe using BJS blender addon to export a babylon file(I’m not really sure but it should support metallic and normal texture).