While browsing the new help topics for Rhino 8, I figured out that certain tools lack a complete description and cautions. For example, the EdgeSrf tool is presented with scarce information, which could mislead the new Rhino users that this is just some basic tool that don’t need much attention. In …

Still no mention about the very important rule to pick first the middle curve or surface edge from the 3 input curves or surface edges in a П-shaped configuration, in order to to build a 4-sided surface…

@Rhino_Bulgaria Thanks for the reminder. I updated the video clip to cover 2-, 3-, and 4-curve cases. I’m going to add some descriptions, but I’d like to keep them as simple as possible.

I’m not sure if we should include this special case, since it isn’t the way most users typically use the command. Perhaps the best solution is to fix the command so it always creates a four-sided surface, regardless of the picking order. [2025-09-08_20-40-33] And picking the middle curve first may…

[image] KelvinC: I’m not sure if we should include this special case, since it isn’t the way most users typically use the command. I don’t know if its really true that most users do not use the command to make a 4-sided surface from 3 curves, but if it is true maybe that’s because the Help is…

You’re not showing the rather typical case - three surface edges/curves, all coming to a point in pairs. A three sided EdgeSrf then gives you a zero-length fourth edge with a proper singularity.

It is covered in this video clip. I’ll add a description about this. [edgesrf]

It’s very often used by me and many other Rhino users to build a 3-sided or 4-sided surface from 3 curves or surface edges. I consider this tool as the best way to build a clean starting surface for subsequent control point massaging, which is important for everyone who aim to achieve good surface q…

The middle example in your GIF image shows another bug which makes it impossible to build a 4-sided surface accurately.

I just learned about this undocumented feature because of this thread. Thanks for posting.

@Rhino_Bulgaria The topic is now updated with more information. [image] EdgeSrf | Rhino 3-D modeling The EdgeSrf command creates a surface from two, three, or four selected curves. [image] Rhino_Bulgaria: Along with that, this tool could precisely match…

Incomplete information in Help topics

Rhino Rhino for Windows

brian (Brian Gillespie) September 16, 2025, 11:06pm 21

RH-89363 is fixed in Rhino WIP

Topic		Replies	Views
Issue creating surface with the _EdgeSrf command Rhino windows , help , rhino7	1	93	July 12, 2024
EdgeSrf Help Rhino windows , edgesrf	1	90	May 22, 2025
Possible Bug: Edgesrf Rhino for Mac	5	1182	October 14, 2015
I cannot avoid naked edges with EdgeSrf command Rhino for Windows windows	4	439	April 11, 2021
Create surface from edge Rhino for Windows	2	628	March 30, 2015

Incomplete information in Help topics

Related topics