So as i was doing a late night install of Vectorworks I forgot to turn down my computers screen brightness and as usual insomnia caused me to make observations of the shadows created.  I noticed that although the source of the light (the computer) and the fans were parallel in areas where the surface that the shadow was created on, in this case the roof, was not parallel the shadows edges were softened. As you can see in the pictures the las picture is of a different fan that is parallel and closer to the roof.