I know that with polypaint each “Active point” in the mesh translates to one pixel on the final image map…
But what about normal maps and displacement maps. Are those generated on a per POLY basis, or a per VERT basis.
Extra points for speed in response.
Everything you do in ZBrush affects the vertices. The polygons just come along for the ride. 
I’m referring to the map the a created when you produce a normal or displacement map.
When these maps get created, do the derive there information(grayscale for Displacements and RGB for normal) from the polygons or the vertices.