And try as you might, in many cases you are just going to have to use a ridiculously wide lens -- and suffer the fisheye distortion -- or just move a wall. (Hey - they do it in Hollywood!) If they are not built or mapped that way already, and you are not a modeler (as I am not) you can usually take it into UVMapper, find the offending wall, and assign to a new material so that it can be made transparent. I suspect this may, perhaps, be even easier with the Grouping Tool in Poser, but I can't help you there. (never tried it)