def __init__(self, dt=0.001, dx=10):
        Simulation.__init__(self, dt, dx)

        self.callbacks = []

        self.ssODE = ssODE()
        self.ssODE.addVariable('space', self.space[0])
        self.ssODE.addVariable('world', self.world)
 def execute(self, caller, event):
     Simulation.execute(self, caller, event)
     self.executeSQL()