Yes, the edges of the walls, but also the inner edges of the arch. The edges will look a lot sharper and smoother in Poser if they have a very small bevel on them. You could make the bevel size adjustable too. In the picture you've posted above, I'd put a bevel on five edges - the outer edge of the wall, the inner edge of the arch and the three edges stepping out from that inner one. You could split the vertices there instead, but bevelling tends to look better.

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