Something’s not right when I try to do this rendering. I tried a few more ways today to improve my rendering result, including
transversely add envMap to the model materials
(hint from this link: Best practices to export and import GLB file to render metals and textures);
using different envMap which was built from a cube;
However, the mount part still looks aluminum-like rather than stainless-steel-like(pics bellow). What should I do now 
