Controlling object natural behaviors in a 3D declarative modeler

We present an extension of DEM²ONS declarative modeler. DEM²ONS provides the designer with the possibility to easily describe a scene in a high level of abstraction, using various types of constraints. It also integrates knowledge about normal use of objects in order to offer the closest solution to what the designer wants. Constraints are maintained by a new incremental constraints solver called ORANOS, that dynamically satisfies the system when a designer´s intervention occurs. It integrates constraint hierarchies to deal with over-constrained problems