I'm seeing something curious in a few of my renders related to this topic. (Like other newbies I quickly found the need for an "actual" ground prop which I now use.) I'm using Richabri's "Light of Day" Set--highly recommended--but occasionally I get a render where the shadows don't meet the character, giving the impression that she's floating above the ground plane when, in fact, she's not. I usually have one of the infinite lights casting shadows with the settings between 0.7 and 0.9, and a map size of 1024. I've tried altering these settings, camera angle, which light casts the shadow, light intensity, etc., and even tried changing the shadow light to a spotlight, but I keep seeing the same result. Any suggestions?