I am turning instances on a template into copies in a glTF file. When I import that glTF file into Blender again, the number of vertices has doubled.
The number of faces also shows as double, but interestingly, the number of tris matches.
I can't see what is causing this. There is an array modifier creating the stack of objects inside the tower, but it seems to be applied correctly. There are no other modifiers, or constraints, or parenting. But when the glTF is imported, and the object that is that stack of rings is edited, and all vertices are selected and then merged by distance with
Ctrl + M, almost 15,000 vertices are removed, reducing the total count by more than half.
What could be causing this?