Since the obj file is a facet-based file. So basically, its going to be crap inside most CAD systems.
You might be able to work on the data in SW2018. But I'm not sure how robust the SW implementation of convergent modeling is.
Convergent modeling is the blending of facet-based geometry and brep geometry and part of the Siemens PL Parasolid modeling kernel that is used by SW and about 15 other CAx applications.
Poly modelers are great at making stuff look real in rendering and animation and is quite a common for people without any engineering or industrial/product design background to use them to develop something that needs to be manufactured.
It's hard to tell clients that have a great looking design in poly model that they have to pay again to have it remodeled in cad. People see this stuff all the time and its just natural to expect that 3d models are universal.
I wish that VFX education could somehow include some basic training to explain the difference between poly modelers and cad modelers, although I don't have any specific ideas about how that could be worked in.
Thank you very much Ryan and Chris for your help.
Chris your advice worked really great.
I can now use smart dimension even if it requires to be more precise
to have the perfect dimension because the body is like in pieces. (see pictures)
but at least I can now use "smart dimension'' I'm gonna try to find a way to merge every piece on the body but not sure to succeed.
Once I'm done with smart dimension and go to ''make drawing from parts''
do you know how to make appear the dimension on the sheet? just asking because mine are not showing on the sheet.
Anyway thank you very much guys.