Hi Psygorn,

re:
> I've got a quick question for you. Could we trust and assume a sealed joined surface object
> as a Solid one (A joined surface object without any open holes)?

There are actually 2 conditions that MoI checks for to give an object the designation of "solid" - that it has all joined edges and also that it has at least 2 volumetric regions in it.


> And I noticed something! ( I had an object; Moi3D said it is a joined surface I saved the .3dm file
> as it was and opened it again now Moi3D says it is Solid) which of course is what I needed but
> it was kind of a surprise for me.

There is probably some kind of anomalous geometry in the object like a degenerate face that is squished flat like a line or areas of the model that self intersect. Such things can cause inconsistencies in volumetric analysis for determining regions.

- Michael