A method of dynamic generation by computer simulation of spatial elements, in particular, buildings and roads, constituting a three-dimensional city environment, the method comprising providing a supervisor subroutine responsible for overall control of the simulation; providing a spatial reorganization subroutine subordinate to the supervisor subroutine and responsible for generating the city environment on a local scale; placing a spatial element in the simulation; generating an inquiry from the supervisory subroutine which is sent to the spatial reorganization subroutine and providing spatial materialization of the inquiry by the spatial reorganization subroutine, which involves agents wherein at least some of the agents are able to negotiate with one another.