public Factory(int num) {
	    Resource res = Utils.myres(this.getClass());
	    this.neg = res.layer(Resource.negc);
	    this.num = num;
	    ArrayList<Tex> strands = new ArrayList<Tex>();
	    for(Resource.Image img : res.layers(Resource.imgc)) {
		if(img.id != -1)
		    strands.add(img.tex());
	    }
	    this.strands = strands.toArray(typebarda);
	}