For various reasons, I wanted to find a particular irregular path in a photograph. With the result to be an openscad array of the XY datapoints tracing along the line's path. It was acceptable to require manually tracing the path in Photoshop, brushing out a mono-color line along the desired path, using a paintbrush. I just posted my .scad for this: https://www.instructables.com/id/Openscad-Tracing-a-Custom-Line-in-a-Photo-Image/ It was at least an interesting exercise in functions! FYI, Rich -- Sent from: http://forum.openscad.org/