/* Fake a Flog.* namespace */
  if(typeof(Flog) == 'undefined') var Flog = {};
  if(typeof(Flog.RayTracer) == 'undefined') Flog.RayTracer = {};
  
  Flog.RayTracer.Scene = Class.create();
  
  Flog.RayTracer.Scene.prototype = {
      camera : null,
      shapes : [],
      lights : [],
      background : null,
      
      initialize : function() {
          this.camera = new Flog.RayTracer.Camera(
              new Flog.RayTracer.Vector(0,0,-5), 
              new Flog.RayTracer.Vector(0,0,1), 
              new Flog.RayTracer.Vector(0,1,0)
          );
          this.shapes = new Array();
          this.lights = new Array();
          this.background = new Flog.RayTracer.Background(new Flog.RayTracer.Color(0,0,0.5), 0.2);
      }
  }