Tutorial location? Floor shadows of green screened actors
I seem to remember a tutorial for something I need/want to accomplish.... but can't seem to find it by searching the terms that I'd think of to use.
I have a green screened actor inserted into a scene. I want to use that "actor" as a 3-d plane to cast a "real" shadow onto a floor in the scene (video clip background). I remember that I need to create another 3-d plane that is oriented / lined-up like the floor image layer in the background shot and then that plane gets the actual shadow from a 3-d light I place in the location that duplicates the rest of the lighting in the background shot. Or something like that.
I cannot find that tutorial. Anyone have any ideas for me? Thanks.