For the snow globe, it's probably best to let Lux do the subdivision. I've implemented Catmull-Clark in the exporter because Lux gets its meshes cut apart at texture seams, which leads to visible seams when Loop subdivision is used inside Lux. Since you have no texture on the glass, you don't need it UV-mapped, and with no UV-mapping, there will be no texture seams.

If you can find the 'Shape' instruction responsible for the snow globe in your output .lxo file, simply insert a line like the following right after it:

     "integer nsubdivlevels"
[3]<br></br>

Then you could try to crank that level up until the glass looks smooth enough.

You might also want this line, but I'm not exactly sure what it does (so maybe not):

     "bool dmnormalsmooth"
["true"]

An alternative would be to use a sphere shape or nurbs, but obviously that's not supported by the exporter, since Poser doesn't have those.

-- I'm not mad at you, just Westphalian.