In Poser, you can easily import the 3ds model. For Bryce, I'd suggest importing it into Poser then exporting it into obj format for Bryce. (Bryce doesn't do as well with 3ds. I know you can smooth out 3ds in Bryce, but obj is better, IMHO.) To bring a 3ds object into Poser, just go to File: Import and tell it 3ds file. Just point to the file and in it goes. To export the object, just go File: Export. Hope this helps!