function World() 
{ 
	
	this.newRun = function()
	{
 		// Code for initial graphics drawing of objects.  
		// Canvas setup:
		//		threeworld.init ( arguments ); 	
				
		// To draw on canvas:
		//		var ctx = threeworld.getContext ( type );		// type = "2d" or "webgl"
	};


	this.nextStep = function()		 
	{
		// Code for graphics re-drawing of objects.  
		// To draw on canvas, see threeworld.getContext as above.
	};


	this.endRun = function()
	{
	};

}