/// <summary>
        /// Initializes a new instance of the <see cref="IWorld"/> class.
        /// </summary>
        /// <param name="PhysicWorld">The physic world.</param>
        /// <param name="particleManager">The particle manager.</param>
        /// <param name="culler">The culler.</param>
        public I2DWorld(I2DPhysicWorld PhysicWorld, IParticleManager particleManager = null, I2DCuller culler = null)
        {
            if (PhysicWorld == null)
            {
                ActiveLogger.LogMessage("Physic World cannot be null", LogLevel.FatalError);
                Debug.Assert(PhysicWorld != null);
                throw new Exception("Physic World cannot be null");
            }

            if (culler == null)
            {
                this.culler = new Simple2DCuller();                
            }
            else
            {
                this.culler = culler;
            }
            this.culler.world = this;
            
            this.particleManager = particleManager;            
            this.PhysicWorld = PhysicWorld;                        
            Dummies = new List<IDummy>();            
            Objects = new List<I2DObject>();
            SoundEmiters2D = new List<ISoundEmitter2D>();
            CleanUpObjectsOnDispose = true;


#if !WINDOWS_PHONE && !REACH
            Lights2D = new List<PloobsEngine.Light2D.Light2D>();
#endif

        }
        /// <summary>
        /// Cleans up.
        /// </summary>
        public virtual void CleanUp()
        {
            Camera2D.CleanUp();

            foreach (var item in Objects.ToArray())
            {
                this.RemoveObject(item);
            }
            
            if (CleanUpObjectsOnDispose)
            {
                foreach (var item in Objects)
                {
                    item.CleanUp(graphicsFactory);
                }
            }

            

            foreach (var item in SoundEmiters2D.ToArray())
            {
                this.RemoveSoundEmitter(item);
            }
            

            foreach (var item in SoundEmiters2D)
            {
                item.CleanUp(graphicsFactory);
            }

            Objects.Clear();
            Camera2D = null;
            Dummies.Clear();
            SoundEmiters2D.Clear();
            particleManager = null;
            PhysicWorld = null;
            this.culler = null;
        }