This happens from time to time and I’ve never known how to fix it.
After a round of editing the object in the image below, it displays as in the image below that. Display settings are the same for both. None of the unwelcome lines are edges.
You don’t say how you are “editing” the object, but I suspect that you are using various sub-object methods - moving faces, edges, etc. which just do not work on the type of curved forms you show. Most likely the lines you are seeing are crazy isocurves from badly broken surfaces…
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Thanks Helvetosaur. Yes, it’s easy to wreck a curvy object with sub-object editing. Many times however I’ve found that small edits don’t result in corrupted results. In this case I moved control points, but only along the longitudinal axis. Even so some of them broke the object and where that happened I undid those edits and used other methods, reassured by an outcome that is what I need geometrically and which “What” tells me is a valid polysurface. Isocurves are unchecked in the display, so I’d expect them not to show.
But obviously something’s corrupted anyway, but I think only in the display. In my experience a valid object like this, with display difficiencies like this, can still be CNC fabricated properly.
Curiously on reopening the project this morning the object displays much better (image below), though several edges are still displayed where they don’t exist (at least not any more than they did in the original object.)
Without a .3dm file, one cannot say much.
Yes thanks Lagom. I’m stretching my NDA to post the image, but I’ll send it to Rhino tech support if it’d help.