Read this on page 196 of Poser Pro Reference Manual.pdf

Smooth Polygons: Checking the Smooth Polygons checkbox causes Poser to smooth the body part’s polygons at render time to eliminate or reduce a “faceted” appearance caused by flat polygons. This option can cause sharp corners to appear round. If the affected body part has sharp edges that you wish to preserve while applying polygon smoothing to other angles, you should specify those sharp edges using smoothing groups or the crease angle threshold, as polygon smoothing will not override these settings. See “Smoothing Geometry” on page 422 for more information on specifying hard versus smooth edges.

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The Artist that will fight for decades to conquer their media.
Even if you never know their name ,your know their Art.
Dark Sphere Mage Vengeance