re:
> When i go to Export and save *.obj (for polygonal renderer) my file name field is always empty.
> Is there a way how you could already have it named same as loaded file name is ?
It should be behaving that way already. But the loaded file name will only be set if you load a .3dm file, not if you open something like a .step file for example.
The next v4 release will have an option for changing that though, as discussed here:
