Problem Union 4.3dm.zip (977.4 KB)
In the attached I have two closed polysrfs. The don’t show bad surfaces or non-manifold edges. If I intersect them I get two closed curves. Yet booleanunion fails.
Hello- there is a near- zero width surface here -
-Pascal
Actually 2 near zero width surfaces (shown in yellow here).
Text dots show the length of the edges at these locations.
-Kevin
They great mystery is why Rhino was creating those zero-width surfaces in a loft in the first place.
Please post the curves used for the loft and maybe we can solve the mystery.
You have an unusual tolerance setting:
Has the model or any of its parts been imported from another system? Have you changed the units from something else to inches?
Problem Curves.3dm.zip (32.3 KB)
Here are the curves. I just lofted them. For the example, I probably left off the last 2 curves at the end.
Everything was done in Rhino from the start in Inches.
The odd tolerance is “1/128”.
I haven’t been able to reproduce the micro-surfaces by lofting your curves. Did you use any of the seam adjustment options?
If not, what release of Rhino are you using? (I’m on 7.27.23009.13001, 2023-01-09)
I just did a loft in Rhino
Version 7 (7.26.23009.07002, 2023-01-09)
Problem Loft.3dm.zip (44.0 KB)
Here is the same loft frames as a before but with the vertical lines removed to create open curves.
For me these always create the “microsurfaces”.
When the loft was closed, I would get them sometimes. If I rebooted (not just restart Rhino), they could go away then come back again.
Thanks very much. I am surprised that does not generate some kind of bad object warning. No idea how those even got created