From the blog "Josh's Dev Blog"

Shadows with a constant softness along their edges have always bugged me. Real shadows look like this. Notice the shadow becomes softer the further away it gets from the door frame. Here is a mockup of roughly what that shadow looks like with a constant softness around it. It looks so fake! How does this effect happen? There's not really any such thing as a light that all emits from a single point. The closest thing would be a very small bulb, but that still has volume. Bec