Hi Filip,
Just to get you going:
[Filip Vandueren] “- how to fake reflections of your surrounding comp in a shiny object.”
You could use your BG or a part of your surrounding as a reflection layer map.
[Filip Vandueren] “- dropping shadows on other layers ?”
It all depends on your animation here, but if you map the layer you want to cast shadows on to a plane in Invigorator (The plane must have the same aspect ratio then your layer) You will this way integrat your layer to the Invigorator world and be able to have it interact with the other objects.
If you have questions just let us know.
Salut.
Serge