dunno, maybe i'm just misunderstanding you, but from how i understand you are talking about a fog which has more density for example on the right side? if thats what you are talking about than you would need to calculate that fog for every object.

if you just replace y by x in the shader you will not have the nice transition between the sky and the rest of the world

www.earthcontrol.de
quoted: We want to maintain a clean, decent, American family suited forum look... which means you may post zombies or chainsaw massacres, but no erotic.