Thanks Kitty, glad you like it
cwichura, I think you asked a similar thing on another one of my products (my memory is weak though), so probably you know already that I unfortunately know naught about Lux.
With that out of the way, I don`t see why Lux shouldn`t be able to render a skybox. The materials in DS/Poser are simple, there is nothing special about them. Basicly it`s just ambience.
The skybox textures are LDR, to be honest I am not even sure if DS and Poser can handle true HDR image formats (HDR lighting/rendering is a different thing afaik).
As for environment maps, when I did the quick UberEnvironment2 test (a few pages back), I simply used the skybox top texture. Certainly not perfect or useable for reflections, but good enough for basic lighting.
Anyway, if you wanted to render the complete scenes (terrain & skybox) with Lux, i guess you`d be in for quite some lighting tweaking.
Sorry if none of the above makes much sense, like I said, I don`t know Lux...just trying to give some general info that may or may not help.