Well I don’t think there is a scaling option in the obj export dialogue in maya…
But I’ve found a not-so-satisfactory solution :
Let me explain…It’s a multi-subtooled character and I want to retopologize one of the subtool (a coat) in maya and bring it back in zb.
As you know when I import the retopologized coat in ZB it becomes smaller than the “source coat”. I select the source coat, hit deform>unify. Doing this the retopologized coat and the source coat have the same size but are smaller than the rest of the subtools…Afer that I have to scale it manualy to give the same size than the rest…and well…it’s not a very clean workflow…
Hope you’ve understood my messy explanations…