This simple lighting model is using the Director Shockwave plugin. If you look at the geometry you can see there is a problem.

Got it?

Right- there are no cast shadows. Everything looks a little unreal, maybe the objects are floating in the air. They do not look stuck to the ground. At the moment this lack of cast shadows is one of the problems with the 3d Shockwave plugin.

If you are ever painting a picture with cast shadows, rather than thinking shadows are black, you can paint them the complimentary colour of the light. So if the light is yellow or orange you can paint them slightly blue, purple or violet. Then see if you think it looks real.