Attached Link: Poser Based Sky Domes

Rutra - The reason Vue scenes look the way they do; is because there is a giant sphere object embedded onto the outermost limits of the scene.  When you look at a rendered Vue scene you are actually looking at the inner surface of this sphere.  The map used to make this surface appear flat; and whatever colors, clouds, etc. are in your sky, can be had from File > Export Sky.

Poser does'nt have a Sky Dome, much less the ability to create a Map for one.  This has really adverse effects when trying to render acruate Reflective, and Refractive materials.  In both images the ball has a miror material; but the first image just has a background image, while the second image has a Sky Dome...

FYI - You can also export a UV Sphere, from Vue, to apply the Exported Sky Map to, within any other application.
BTW - This second image is really a Semisphere Sky Dome fFigure(free from Ajax, at DAZ.)  That is why my mirrored ball has that dark round spot at it's bottom.