Quote - newbee question: how can i select the whole body and apply a shader effect.

You can address  multiple materials in one go with a material collection (files with .mc6 or mz6 extension). You can create these on your own by clicking + "Add to Library", then choose "Material Collection" and "ok" to save or "Select Materials" first to specify which materials you want to save and the "ok" to save.

Le cinéma substitue à notre regard un monde qui s'accorde à nos désirs. - André Bazin