I’d be interested to hear what you propose as useful alternatives, or why you say you almost never want the parallel curve… Others pointed out stroking, and in

I’d be interested to hear what you propose as useful alternatives, or why you say you almost never want the parallel curve… Others pointed out stroking, and in graphics stroking isn’t just common, it’s ubiquitous and you’re using it right now, because fonts are stroked as are lots of your browser features (I can see stroked rounded edge on my comment edit box, in addition to strokes on vector based SVG icons sprinkled on my screen). Most/all paint and drawing apps have stroked paths, etc., like Photoshop & Illustrator. All the online “whiteboards” use stroked paths. These are all offset curves or parallel curves according to the above definition. 3d graphics uses offset curves too for hair rendering, rigging & simulation, just as one example.