Yeah, I saw that… good catch and link. I almost pasted a link to this thread… over in that/those threads… a little while ago.
Sorry to hear you are having problems… but don’t be down on yourself about it. Such a task is not an easy thing to do… and I sure didn’t give you much help/info. (sorry)
I sort of like what @sebavan said over there… maybe insinuating that we need a “special” mesh-merger tool… that “processes” imported models… attempting to get them merged-up and ready for mergedMesh.createInstance() calls.
I’m not experienced enough to see the far-impacts/problems in building such a tool… but others nearby, are. Let’s hope they are planning and plotting some fresh ideas.