If the wall doesn't move, why not consider using static lights, as dark samurai already said.
[EDIT] he talked about realtime shadowmapping, my mistake!
Static lights are baked witth the map compiler and cast shadows.
Because you need no shaders fot this, They are also a lot faster than dynamic shadows!
For this you need to build your level with blocks in wed.
Last edited by Roel; 12/10/11 20:40.