Thanks Mike for the suggestion. I will try eventought I'm not sure It will work in my case. In fact, since what i want is the planet Heart rotating in the space, illuminated by the sun, with NO ground, and with the camera goig around, I had already to do this: * delete the ground * create an infinite plane with a perfect reflecting material, orientating it down (so it is not paralled to the "ground" that does'nt exist) * set the sky with stars, working alot in fog, haze and skymap positions, to avoid a "break" between the real sky and the reflected sky on the plane "downstair" :) So, I don't know what will happen addin one more plane but I will try and I will let you know.