I've been trying to get this style of plotter image to work since before 2012: representing brightness with isolines of a function with higher gradients where the image should be darker so the lines are closer
After getting something close but not very good a couple of months ago in the last two days I saw a post on Reddit with a new technique to try (fast marching method) and yesterday I got a process working in Python. Over 13 years and it finally took a day