OK, this is a great tut but it doesn't really solve my problem. It seems the only ways to mark edges for cutting is to select 1 vert at a time or box select straight lines. Neither of those is very practical for hidden areas on complicated organic models (insides of ears or whatever) so I've come up with a workround. It's not ideal so if there are other selection methods (by material?) I'd love to hear about it! What I'm doing is this Cut up your model into seperate objects, face, back of head, ear etc., this is easily done if you've assigned mats/groups as you build. Now map each object seperately. No selection invoved makes this almost a one click operation in Blender! Now open all your parts in one file, make sure you don't move them! Now weld them back together. This might vary from one app to another but Cinema preserves the mapping through this process. It's not nearly as complex as it sounds and it works! :o) Well, it might help someone! :o) - Baz