What is the best way to simulate differents ground (one per piece), the water in the pool, the glasses on the windows or simply the land ? A solid or just a surface ?
For the glasses and the water, is the height of the material has an importance for transparent materials ?
In the case I want different materials on each wall, what is the best way ?
simulate in regards of realistic rendering? if you want physically correct refraction from the water it would have to be a solid. for a flat texture without real refraction a surface will suffice, that means any non refractive material can be done with a simple surface either. but that all depends what you actually mean by simulate.
i am not aware of any layering option in rhino for textures, i believe you should prepare your texture before. implementing simple text on a surface for instance can be implemented with an extra surface and some alpha channel or a transparent png which you stack on top of the other texture.