function World() 
{ 
	
	this.newRun = function()
	{
		// Code for Three.js initial drawing of objects.
		// Should include one of:
	 	// ABWorld.init2d ( arguments ); 	
	 	// ABWorld.init3d ( arguments ); 	
	};


	this.nextStep = function()		 
	{
		// Code for Three.js re-drawing of objects.  		
	};


	this.endRun = function()
	{
	};

}