Ahhhh you sneaky person :)

Thought it would be somewhere - I looked in the line style options too, must be getting old n tired

Thanks Michael

MSF

** EDIT **

And of course the Mac preview viewer don't have a layers option .... bookmarks, table of contents etc but no layers

On the Mac side of things you could use iDraw to display pdfs layers and edit the output from moi3d, add dimension lines etc.
http://www.indeeo.com/idraw/mac.html

Colin

Nice pointer Colin, appreciated. I shall have to add that to my shopping list at that price :)

Martin Spencer-Ford