EdgeFlow fixes the loop that lands flat. Insert an edge loop on a curved surface and the new vertices sit on the straight chord between the neighbouring loops rather than on the curve, which reads as a crease once you subdivide. Set Flow reads the edges crossing that loop and moves each vertex onto the curvature they imply. The manual alternative is nudging every vertex along its own perpendicular by eye — which is why the same operator exists in 3ds Max and Maya.
What It Does
- Set Flow curves a loop to match the surface implied by the edges crossing it, with tension, iterations, a mix factor against the original position, and a minimum angle cutoff
- Blend controls taper the effect toward either end of a loop, by vertex count or fraction
- Set Linear straightens a loop between its start and end vertices, optionally spacing the vertices evenly
- Set Curve curves along the loop’s own direction instead of across it, with a rail mode that steers interpolation from the first and last edges
- Set Vertex Curve works on loose vertex selections in picking order: two vertices give a half circle, three a circle segment, four or more a spline
- Holding Alt on any of the curve operators reuses the last settings
Good To Know
- Free and open source under GPL-3.0-or-later, by Benjamin Sauder, source and issue tracker on GitHub
- Version 1.1.2, Blender 4.2 LTS and newer, 34 KB, no permissions required
- 194,000+ downloads, rated 5.0 from 82 reviews. Lives in the Mesh > Edge and Mesh > Vertex menus, and the right-click menu
- It reads only the surrounding topology, never an original surface. There is no target to shrinkwrap against, so if the neighbouring loops do not imply the curvature you want, it confidently produces the wrong shape
- Loop traversal stops at poles. On pole-heavy or n-gon-heavy topology you get partial coverage rather than a clean run
- Set Vertex Curve is only available in vertex select mode, and its result changes with the order you click the vertices
- Set Linear does not handle closed loops, and there is an open report that it fails on flat surfaces
- Tension defaults differ per operator — 180 on Set Flow, 100 on Set Curve, 0 on Set Vertex Curve
- Documentation is a README and some GIFs. Expect to learn the parameters by pushing them
Where It Fits
Install it if you do subdivision or hard-surface work and regularly add support loops to curved geometry — it turns a per-vertex chore into one menu click. Skip it if the problem is retopology accuracy against a high-poly source, where shrinkwrap remains the correct tool. Modellers coming from Max or Maya will recognise it on sight.