I’ve four 250k vert square meshes trying to model a topographical map of 100km^2 of London. I’ve tried to join them together fully so that I can accurately add Victorian maps on the surface as ‘decals’ (in the manner of: Map Input/Object/Empty) before rendering. Texture and ‘decal’ manipulation is not possible across the whole joined mesh but is separately handled on each of the four intial squares. In other words, the mesh is not a complete whole object. A check in the Outliner window indicates this and I’ve Unlinked the objects in an effort to clean it up.
I’ve positioned the four Objects within 0.001BU of each other to make one large square and used Ctrl-J to join them. I’ve also tried using Shift-Alt-RMB on the edges in Edit mode and F/Skin Faces to fill the gaps to make one continuous mesh. Alt-M/collapse on edges and verts doesn’t seem to work on simple test meshes either, it seems to delete too many verts.
What’s the answer please?