How to detect the closed body?

[voljanko]

I would like to detect if a body is closed,so all the faces are connected.For example,if I check the cube with additional unconnected line or face,I should detect the cube.So how to loop faces and edges to find that the body has no holes?
Thanks.

[pilou]

Solid Inspector by Thomthom ?

[voljanko]

Thank Pilou.
I have fount this interesting in the Solid Inspector plugin:# Any edge without two faces means an error in the surface of the solid.

But this is not enough to detect a potential solid, because not all edges with two faces means the solid.
There is still a definition missing,what combination of edges and faces makes a solid.
Any tips?
The award will be a useful and free plugin

[Jim]

@voljanko said:

But this is not enough to detect a potential solid, because not all edges with two faces means the solid.

I thought this was enough? If there is an Edge with only 1 Face, then there is a hole in the solid. If there is an Edge that has 3 or more Faces, then there is an internal Face.

[TIG]

I have difficulty conceiving some 3d geometry where all edges do have two faces but it isn't a solid ?? As Jim says a tetrahedron is the simplest form buy if you add any internal partitions or have 'flaps' then there will always be some edges which have <>2 faces!
Doesn't group.manifold? also return false if the group is NOT 'solid' ? [there's a similar test with component_instance.manifold?] Then you don't need to worry about testing edges/faces ?

[voljanko]

Ok,I like this definition:If all the edges in the geometry have 2 faces ,it is a solid.
Maybe I have complicated a little