How to get the real length of a 3D room

Hi, I want to built a 3d room. When I import a obj file, the vector3f length does not equal to the real length(much longer than the real one), I know there must be relation between them, but how I can get the relation?
for example:
T3Droom.setTranslation(new Vector3f(0.7f,1f,0.5f));
How many metres the 0.7f equals to?
thanks a lot

javax.mail.Address[] addrs= m.getFrom();
Address a = addrs[0];
if (a instanceof InternetAddress &&
((pers = ((InternetAddress)a).getPersonal()) != null)) {
String addr = ((InternetAddress)a).getPersonal();
} else
addr = a.toString();
this 'getPersonal()' is the thing you need.

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How to get the real length of a 3D room

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