by Lazur URH - uploaded on December 5, 2016, 8:45 pm
Three shifted hatching overlaying eachother can produce a halftone effect, commonly used in printing.
Testing out the idea by three individual hatch filters and blending them together.
Could be rigged into one and use three image filter primitives in such a filter.
Matter of time, needs just copy-pasting from one filter to another.