Update - the armchair/ottoman difference seemed to be a difference in the unwrapping, instead the problem on the floor persist, but I discovered a couple of things:
I’ve tried to use a texture of 2048x2048pixels instead of 1024x1024 and doubled the tiling (14-8 instead of 7-4) to see if it was a problem related to the quality of the texture
the result is even worse, now it seems a sort of minecraft effect and there are two interesting consideration to do:
- if you look on the left of the floor there is a line were the texture quality start to drop considerably (I drew a line to sign the border I’m speaking about)
- if I move myself of just a couple of meters the texture has another (smaller) quality drop
these observation reminded me this old post on the answerhub
[iOS Bug: Material "normal" input will not wrap. - Rendering - Unreal Engine Forums][4]
but there the staff said that problem was corrected already with 4.9 preview1 version: could these problems be related?