Is it possible to apply a shadowvolume/some other thing to a prop which allows it to cast a shadow on itself? The reason I ask is because I've created a large indoor facility with one large base model, and it doesn't seem to be casting shadows on itself. My explanation sound really weird, I know, so if you don't get it I can post a picture of what I mean.
EDIT: Here's a pic. As you can see, the units shadow appears to be floating because the prop isn't generating its own shadow.