/* Fake a Flog.* namespace */
  if(typeof(Flog) == 'undefined') var Flog = {};
  if(typeof(Flog.RayTracer) == 'undefined') Flog.RayTracer = {};
  
  Flog.RayTracer.Light = Class.create();
  
  Flog.RayTracer.Light.prototype = {
      position: null,
      color: null,
      intensity: 10.0,
  
      initialize : function(pos, color, intensity) {
          this.position = pos;
          this.color = color;
          this.intensity = (intensity ? intensity : 10.0);
      },
      
      getIntensity: function(distance){
          if(distance >= intensity) return 0;
          
          return Math.pow((intensity - distance) / strength, 0.2);
      },
      
      toString : function () {
          return 'Light [' + this.position.x + ',' + this.position.y + ',' + this.position.z + ']';   
      }
  }