I guess I see now how the "stacked vertices" type thing is possible using groups.
The "no stacked vertices allowed" thing seems to be within a single "entity container".
There is one entity container that just is part of the SketchUp document - this is where MoI currently writes all of its objects to, I think it's the same as if you had just drawn them all directly in SketchUp.
But it looks like when you make a group, the group has its own separate entity container and vertices that are created in there do not have to be fused to vertices in other containers.
I never really figured this out before from looking at the API, the API itself doesn't really have much documentation with it or descriptions of these kinds of issues, and that term "group" is not often used with other software to mean "the way to make non-fused vertices in the same x,y,z locations".
In MoI v3 I should be able to make an option that would write each MoI object into its own separate group so that they could remain more independent from each other.
- Michael
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