Are you talking about modular designed environments for a game with an isometric view? Cause that's what the Sim's is. I'm wondering if by "tiles" you're talking about modular environment/level design.
reckon that depends on your game engine or how it's all built. If you were using unreal, you could do these all as individual static meshes and just copy/paste them all around. If you were assembling the scene in max/maya (or whatever), it might be better to weld all your verts when you're done. Again, this is really up to…
this is interesting, could someone maybe put up an example up? i think i know what you guys are talking about but im not sure, and this interests me greatly so lets say if you make a coridor(simple inverted box, same material all around), you make one poly and Uv to a certain (tilable)texture. Then you would paste that…