Ribbon smooth
From PyMolWiki
Overview
This PyMOL setting determines smoothly how PyMOL draws ribbons. Turning on the setting smooths out the ribbons and make the image look cleaner. The setting is by default off, and yet, when turned on shows absolutely no decreased performance.
Usage
#show ribbons, first hide; show ribbon # turn on smoothing set ribbon_smooth, 1 # turn off smoothing set ribbon_smooth, 0

