There's something I want to achieve that I just can't seem to using Shadow Catcher.
What I want to achieve is:
Where everything that is orange in the image I want to be Alpha. The spheres bob up and down with the plane hiding the underneath of the objects but i want the shadows that appear on the plane too.
When I apply Shadow Catcher the the alpha channel of the plane material I can see through the plane but i don't want to see through it, just see what was visible on top of it, with the shadows: