Has anyone come accross a method and/or software that allows hidden line display of hidden features in 3d models.?? Eg. a slot on a object would appear has a hidden line when object is viewed from reverse side of same slot. If such software exists, does it have an adjustable depth plane of hidden line display. This is not so much a question than a wish list for such a feature in 3d. Because in all the BIM apps I've seen thus far, this feature seems missing.