Mathematical Line Drawings in Blender

Blender is a software package for 3D graphics. It also has the capacity to produce line drawings (via its "Freestyle" and "Grease Pencil" features). So, it is potentially useful for drawing figures in topology research papers. Here are some experiments along those lines. I have included both Blender's 3D rendering and its line drawing. In some cases, I cleaned up the line drawing Blender produced, using Adobe Illustrator.

Since some web browsers don't render .svg files reliably, I have included both .jpg and .svg version of the line drawings. Click on any of the images for a larger one (or, for the .svg files, to download just that file). I have not formatted this page to render well on cell phones -- try a computer or tablet.

Description	Rendered image	Line drawing (.jpg)	Line drawing (.svg)
A saddle cobordism, from a forthcoming expository paper with M. Khovanov.
Another cobordism, from a "Homotopy functoriality for Khovanov spectra"
A ribbon knot, used as a cover graphic for some talks I gave.
A bordered Heegaard diagram, from an NSF proposal.
A 2-periodic diagram of the trefoil, from a talk.
A (4,7) torus knot, from a movie illustrating a free period of it, from a talk.
A piece of a Heegaard diagram, from a talk.