Quote - Can you post a pic of the effect you're describing?

One thing you probably need to do is to adjust the crease angle as well as turn off "Smooth Polygons" under the object menu.  Adjust the crease angle to something like 30 or so with Smooth Polygons turned off/unchecked.  The crease angle is used in several other calcs so it also usually needs to be adjusted.

the link to the test renders is http://www.lullys.com/!!!!temp/BLpoly.jpg one with and one without smooth polygon checked, 

Tools:- Win10, Dell XPS8900, ZBrush, Marvelous Designer 11, Hex 2, PSP8. PSP 2019 Ultimate, DAZ Studio, Affinity Photo, Affinity Designer, Filterforge 11, flowscape,  Classic UVMapper, and several headache tablets.