How to get proper lighting configuration for a custom GLTF viewer?

[Mugen87]

The recommendations in Enable Sketchfab-like lighting and shadows might help.

@betofc89

P.S. I can’t see the buttons in this forum editor, neither the buttons to like answers, and other buttons as well. This commentary is not a criticism, but only to help

That seemed to be a temporary hosting issue. Should be solved now.