It’s my pleasure to ask my 3rd question.
The problems are:
The shadow of any object is not realistic.
Not same feeling as blender.
I am working with Blender for modeling, mapping and exporting as gltf/glb.
But the view feeling of each model on Web browser, it’s not same as on the blender.
Of course, I didn’t exported light and camera. Just models with textures(diffuse, bump, emissive…).
Hopefully, would like to hear your advice.