Hi all -
Found a weird one. The surface below has 6,3 controls points, and 4,2 degrees.
If I collapse any two points at the end of the surface, everything works fine. I can select points, and the UI displays a disambiguation pop-up when 2 points overlap. However, if I move all three points to be coincidental, I lose the ability to disambiguate: it will only let me move all three points at once, and I can’t separate them anymore.
Cheers,
Tom
Yes, that is standard Rhino behavior when an edge is collapsed to one point. That makes a “singularity” like the pole of a sphere. If you select the single point and run the Smooth command, they should separate back out again by a very tiny distance.
And it continues to be an anoyance for me. I assume there was a “good reason” for adding this “feature” but it can result in a need to remodel a surface when the collapsed edge needs to be spread out.
Does not work for me in V9 WIP with the example I tried.
Surface collapsed edge.3dm (2.0 MB)
I think the “good reason” is when you have something like a sphere with possibly dozens of points collapsed at the pole, that the pole can be selected as a single point.
Looks like you need to uncheck “fix boundaries” for it to work. I think the last time I neded to do this years ago, the Smooth command didn’t even have that option.
