What are polyfill/POEX/POIN apertures?
These types of modern Gerber data entities are actually not apertures at all. They simply give the plotter the instructions to either fill the area bounded by the closed outline of vector draws, or to make a void within it. In 274-X, the parameters that switch this on or off are the G36 and G37 codes. In F9000/Autoplot files, POEX tells the plotter to fill the area and POIN tells it to make a void. In DPF files, the Contour command generates a filled area, and the Reverse Contour generates a void.
