I’m trying to render a cup trophy: it’s a plastic semisphere on a metal stalk.
I have read the studio light setup tutorial and hdri also but the effect is always matte/flat
I have tryed with official vismat material and changed the color of background but is always flat
With metals, poor results are almost never attributed to the material itself, but more an issue with what is being reflected. Right now, all your reflecting is your groundplane/backdrop. This is partially because that’s the shape of your object and also because you’re looking slightly down on it. I would suggest trying out some studio hdris and possibly having a smaller ground plane (ie just enough to fill up the view) so that you can see the hdris