what am I doing wrong? for weeks I’ve used “surface from edge curves” and always ended-up with a surface that closed with its neighbor. Art Smith 2p750 elliptical horn for Weber 32-36 Rev A.3dm (1.4 MB) [problem closing machining pocket]

Gijs- the construction/sequence I’m using is accurately depicted in the collage posted. I suspect where things are going a stay is my use of a single one rail sweep in a misguided hope that Rhino 8 will “handle” all of the resulting internal edges from the joined curve….. exploding the single …

[image] Gijs de Zwart: If I explode and rebuild the edges, then make new Sweep1 surfaces Why are you exploding and rebuilding edges? What does that have to do with the reported problem? The OP supplied the curves used for the sweep1. here is the basic problem without all the distractions i…

[image] jim: if I make the surfaces as five individual sweeps (one for each edge) then join the surfaces it works correctly I was about to post that. That makes it is clear where the issue is rooted. RH-90215 Sweep1 results in bad objects

I tried this in Rhino 7. No bad surfaces after joining them all.

[image] Rhino_Bulgaria: I tried this in Rhino 7. No bad surfaces after joining them all. thanks, I’ll add that information

Brian- outstanding, thanks!! Art Smith

[image] Brian Gillespie: RH-90215 is fixed in Rhino WIP Doesn’t look to me like anything was done to fix Sweep1. It still makes the same surfaces with bad edge curves. In RhinoWip when you join the sweep result to the EdgeSrf surface made from the sweep’s edges it no longer makes a BadObject…

thanks @jim for reporting. I’ve opened a new issue for this, since the other issue ended up being a Join issue. RH-90361 Sweep1 creates unjoinable polysurface

[image] Gijs de Zwart: I’ve opened a new issue for this, since the other issue ended up being a Join issue. The join issue was due to an attempt to join to a surface with bad edges. The real problem here is Rhino is not identifying the result of the sweep as an invalid construct. [image] …

[image] jim: Why focus on join? Since it fails at Join, that needs to be checked too, like you have seen in the previous issue, starting at the point of first failure. Mikko needs to check if there is still an issue left to solve in Join, and can then forward the rest of the issue to Dale.

Surface modeling problem

Rhino Rhino for Windows

brian (Brian Gillespie) November 4, 2025, 11:42pm 23

RH-90215 is fixed in Rhino WIP

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Surface modeling problem

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