Hi all. I’m working with 2 other people with SubD over the last 2 years. Almost daily. What is the progress? Will we have curvature graph for SubD on V8? (this really should have been a 7.0 feature) (I can use history to see the curvature graphs of the edges of the SubD, but history doesn’t work…

[image] Pierre Cuvilliers: I mean, the mathematical definition of “concave” is “not convex” and that’s precise enough (for open surfaces, we can just use the direction of the normal as what is up and down). But that does not mean what you describe later, because that definition of concave includ…

[image] Pierre Cuvilliers: I’m writing up a request for a double-concave/double-convex/0-gaussian curvature analysis display with all your good ideas, thanks. @pierrec May I suggest there is time allowed for a bit more discussion with input from more than one user before submitting your reque…

I would prefer: [image] Pierre Cuvilliers: Or 5 colors for positive Gaussian curvature with both curvatures pointing to the back of the surface (locally convex) positive Gaussian curvature with both curvatures pointing to the front of the surface (locally non-convex in all directions), negati…

Hi Pierre, Riccardo, Thanks for looking into this. Yes we want something that shows local concavity vs. convexity, or where there is an inflexión of curvature direction. Also where the model reached planarity (within tolerance). Dots, zebras, leopards, anything will be a good start to see where w…

This is the result of the script I’m using (I found an old version…) [2023-05-24 20_52_02-Window] darker areas = double concave whiter areas = double convex sort of, this version wasn’t really good… In my workflow I care to avoid too-curved shapes and double concave shapes so here I’m just eva…

[image] Pierre Cuvilliers: Like Zebra but with dots? Hi Pierre, I think a _Leopard command would be useful since it seems to help identify non-G2 edges much more clearly than Zebra does. Maybe some will disagree but I think it would be a good addition to Rhino’s surface analysis toolset. Her…

Here’s what I took out from the extensive discussion in this thread and the many others that were linked from it. It is a request for a curvature analysis display mode that focuses on visually finding the areas that form concave dips, convex bumps, or are planar for some tolerance, in a surface. Ac…

[image] David Cockey: Are “double-concave/double-convex” terms which were made up in this thread, or are they generally used. They were invented for this thread and do not need to be used again. I just felt like it was the easiest way to make sure we all had the same non-standard definition o…

[image] Gustavo Fontana: Dots, zebras, leopards, anything will be a good start to see where we have areas with single curvature. @gustojunk I still do not understand why or how you would use Zebras (or dots) to find areas with single curvature. Gaussian curvature is the usual tool for this.

[image] Pierre Cuvilliers: [image] davidcockey: Are “double-concave/double-convex” terms which were made up in this thread, or are they generally used. They were invented for this thread and do not need to be used again. … I think those terms are really on point, specific, useful. Imho…

Tried WIP since months

Serengeti (Rhino WIP)

brian (Brian Gillespie) October 30, 2025, 7:28pm 55

RH-76806 is fixed in Rhino WIP

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Tried WIP since months

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