I have a building shading a 2nd building and there is a third building (larger than the 2nd) behind the 2nd building. I want to show shadows on the 3rd building by the 1st building but not those blocked by the 2nd building. I do want shadows cast by the first building on the 2nd bldg. and the shadows caste by the 2nd on the 3rd. I keep getting shadows on the 3rd building from the 1st building which should be blocked by the 2nd building. I have made all faces of the 2nd building to 100% opaque, set the session style not to allow transparency. Just to check I turned off cast shadows by the 2nd building but the shadow of the 1st building stubbornly goes thru the 2nd building and hits the 3rd.