In this tutorial I show a technique to simulate a so called Area Shadow.
These shadows are quite time consuming to render in 3D applications.
Here we have them in real time. But they only work on the ground (this time).
Also, with the same technique, I fake Global Illumination - also just on grounds.
If you once understood the working way, you can then put those shadow also on walls.
Below is a link to the whole After Effect scenes, that you can see in the movie.