Abstract: A module state engine for simulating a large structure is configured to receive an input defining a force applied to a module in the large structure and in response, to update a mode associated with none, one or more of the modules in the large structure. The mode associated with a module is selected from: an inactive mode, a full simulation mode and one or more proxy modes. In inactive mode, a rigid body representation of an entire module is not animated. In full simulation mode the tiles within the module are simulated individually. In the fracture proxy mode, the rigid body representation of the entire module is not animated but a tile within the module can fracture into chunks, and in the simulation proxy mode, the module is simulated as a single rigid body and tiles within the module cannot fracture into chunks.