export from 3ds in autocad maintaining solid entities

[mir]

I have this container in 3d in 3ds and when I convert it into dwg I become a mesh that loses the solid properties ... you have some advice to give me why this object becomes a solid in cad?

Thank you.
♪

 

[lattu]

Unfortunately, solid properties are lost in conversion.
The only way to have it solid in cad is to recalculate it on mesh or do it by someone.

 

[PlannerRoad]

here if it was already spoken:
http://www.cad3d.it/forum1/showthread.php?t=12615