var Sculpture = new function(){
	
	var base = this;

	base.list = {}
	
	base.mouse = new mouse ({ use_offset: false, mousedownUsesCapture: true })
	
	base.init = function(){
	  app.on("move", base.updateBillboards)
	  base.resize.init()
	}
	
	base.updateBillboards = function(){
	  base.forEach(function(sculpture){
	    if (sculpture.billboard) {
	      sculpture.mx.rotationY = cam.rotationY
	    }
	  })
	  if (Sculpture.resize.obj && Sculpture.resize.obj.billboard) {
	    Sculpture.resize.move_dots()
	  }
	}

	base.add = function(opt){
		var sculpture
		switch (opt.media.type) {
			case 'image':
				sculpture = new Sculpture.types.image (opt)
				break
		}
		base.list[sculpture.id] = sculpture
		return sculpture
	}
	
	base.addNext = function(opt){
	  opt.newMedia = true
		opt.media = Scenery.nextMedia
		var sculpture = base.add(opt)
		
		// test if sculpture was placed here
		if (! sculpture) {
		  return null
		}
		else {
			Scenery.nextMedia = null
			return sculpture
		}
	}

	base.find = function(id){
		return base.list[id] || null
	}
	
	base.remove = function(id){
		var scene_media = base.list[id]
		delete base.list[id]
		scene_media && scene_media.destroy()
	}
	
	base.removeAll = function(){
		base.forEach(function(scene_media){
			base.remove(scene_media.id)
		})
	}

	base.uid = new UidGenerator(base.list)
	
	base.forEach = function(f){
		return base.values().forEach(f)
	}
	
	base.map = function(f){
		return base.values().map(f)
	}
	
	base.values = function(){
		return _.values(base.list)
	}
	
	base.serialize = function(){
		var sculptures = base.map(function(sculpture){
			return sculpture.serialize()
		})
		return sculptures
	}

	base.deserialize = function(sculpture_data){
	  var added = []
		sculpture_data.forEach(function(data){
			var scene_media = base.add({
				id: data.id,
			  data: data,
				media: data.media,
			})
			added.push(scene_media)
		})
		return added
	}

	return base
}

Sculpture.types = {}