@Gijs @menno The effect of the “Flat” parameter on the results of the current version of GlobalEdgeContinuity (9.0.26055.12305, 2026-02-24) are unpredictable. Two simple surface with G0 and G1 continuity but not G2 continuity across the coincident edge. GEC_CurvatureBug_DC01.3dm (204.6 KB) [ima…

From what I can see it works exactly as designed/expected. But the Flat value can be a bit confusing or counter intuitive. If you set your flat radius to something low as 13 for this example, then all curvatures of these two surfaces (measured perpenducular to the edges) are larger than that, and w…

Btw @davidcockey this was a recent change, we’re still in WIP and I’m not very happy yet about this (confusing) part. There must be some indication in the viewport about this. But I have to think about a good way to do this. Sometimes only part of a surface will be treated as flat. In case of a se…

@Gijs Thanks for the reply. I’m starting to understand the revised curvature continuity analysis. I assumed “Flat” was a curvature value, not a radius value, based on the post you linked which I was already familar with. That post describes the parameter used to decide if a surface is flat as a cur…

GlobalEdgeContinuity - Flat parameter effect unpredictable

Serengeti (Rhino WIP)

brian (Brian Gillespie) March 11, 2026, 12:23am 5

RH-93498 is fixed in Rhino WIP

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GlobalEdgeContinuity - Flat parameter effect unpredictable

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