. I was making the wrong question. Sometimes I want to have a texture for example of tiles which is not quadratic, which is covering instead the entire wall, without seeing the borders of the tiles, I don't want if I am clear. Anyway, I tried using the scaling factor of the tile in order to do that. Here is what I realized:
Do you notice the defects located for example near the mixer faucet? I don't know how to solve them, any suggestion?
Later I will try to use the light panel as you suggested and also the glossy shader, thanks.
The result you posted with the shininessShader set to glossy is wonderful!!!