Thinking futher on how to select one side. Would it be possible to select a polygon (using vertex normal) and then have the program work through and find adjacent polygons with the a very similar normal (the other normal of a two sided poly side would be 180 degrees reversed). Let's say you accept that an adjacent poly, with a normal up to 44 degrees different from the current poly, can be considered as being on the same side. Some method of manual editing would definitely be required, as the above method would 'fail' at a 90 degree (or greater) angle betwwen two poly's on the same side. But angle > 90 can create artifacts in Poser renders anyway due to it's attempt to 'round' the model. Just a thought. Ian