Hi all, Thanks compiler. I think some would liken me more to Inspector Clouseau , except nowhere near as funny. Grey cat. I don't think it matters how big your cube started off. The important thing is it's dimensions in Autocad, just before you exported it. these were 1", 1 1/4", and 1/16" I believe 1 inch is Autocad's world unit, so when you export your cube it sides have lengths of 1.00, 1.25, and 0.0625. Each of these is the percentage of one inch that the fractional sides work out at. When you import this into Poser, it gets converted into Poser world units, whatever they may be ;-). So now you can spin the dials in Poser, and your boxes will move correspondingly. For your example it works out fine to assume that the world unit is 1 inch in Poser, because there is not other reference. It only starts to matter when you bring Poser figures into the scene (which are all less that 1 world unit tall) and you want to think of them as people of typical human height. As an aside, if you were creating a scene where the figures were supposed to represent wargaming model soldiers, then you could keep your 1 PU equals 1 inch world unit. And all your figures would be about 3/4" tall. I think this is an unusual case, but it shows you can assume 1 Poser unit is any size, if it fits your particular needs. Most of this thread is aimed at recreating 'real world' images,and interchanging models of specific dimensioned between users, hence the wish for a constant, coupled with ease of use. If I have misinterpteted your post, please let me know. Ian