chris, notice how refractive shader in current poser version(s) causes contact shadows at bases of glasses.  then look at wine glass on table cloth in room with indirect light.  one won't see that shadow.  check bagginsbill's posts on how to correct this.  he even has wine glass freebie, but I can't use it, as it has wine shader incorporated into the goblet section, rather than wine prop, which would use refractive shader.  ISTR anthanasius has also posted thin glass shader several times here.