Thanks, I'll give it a check, and try to work from that point. 

If i manage to accomplsh what i want i can publish the solution, for someone else who needs it.

im using an SDK that loads OBJ, FBX and MD2 files, and uses it in an augmented reality environment.

I would like to build my models to load it on this SDK.

Basic example: I would like to have an activity where the user specifies with form he would like to build (box, sphere, cylinder) and respective properties (size, radius, etc); and a second activity where i could use the SDK to simply read the object created by the user.