So basically, I am importing meshes from a babylon file; they are tiles for a maze. I clone them to create several rotation-wise clones of these tiles and obtain the full set of tiles. Then based on the results of a maze generator I clone the tiles of my full set of tiles in the right positions to make my maze. Here the results before merge (sorry for the ugly materials and textures, I was testing stuffs): And here is the hierarchy:   So now, I am going