Hi @chris,
I’ve input a circular surface into the HB Face component and it’s giving no output without showing any error message. I thought it might be due to holes, so I’ve tried inputting another circle with no holes. Both of these produce the same result - feels like I must be doing something wrong but I can’t think what… please could you take a look?
hb face not generated - no error.gh (12.1 KB)
Thanks in advance,
Charlie
Hi @charlie.brooker, I cant replicate your issue:
Thanks for testing @TrevorFedyna!
Very odd I’m getting this issue… I’ll try a restarts/reinstalls
I’m using this for a Radiance study so ignoring the energy modelling protocols!
Many thanks,
Charlie
Good to know - I’m on Rhino 8. I’ll ask a colleague with both versions installed to test
Hi @AbrahamYezioro, @TrevorFedyna,
This does seem to be a Rhino 8 issue. I’ve got it open in Rhino 7 and all working as expected.
I’m guessing something has changed with how curves are defined in Rhino 8…? Planarize brep removes the curves - hence working after passing through.
Rhino 8
Rhino 7
hb face not generated - no error.gh (23.8 KB)
I think this is well worth interest of the LBT dev team, inputting curved surfaces and getting no output without warning is a risk for many workflows, e.g. these curved surfaces could be a few critical surfaces in a long list of inputs, with the error then being undetected.
Best,
Charlie
Thanks, @charlie.brooker ,
I won’t have the opportunity to look at your file for a while but I can clarify that plugging in curved breps into the HB Face component is supposed to be fully-supported. When this happens, the geometry is supposed to get planarized using the same methods that run under the hood of the HB Planarize Brep component.
I might receive moment just double-checking what model tolerance you are using in Rhino 7 vs. 8 and make sure that they are the same so that we can rule out tolerance as the cause.
Also, if you can confirm which service release of Rhino 8 you are using, that would be helpful.
Thanks @chris,
I’m using:
Version 8 SR21
(8.21.25188.17001, 2025-07-07)
I’ve just opened a new Rhino file using Large Objects - Meters template. Here’s a screenshot of Document Properties - Units
Opening GH and the file linked above, I get the same as before - no output from the HB Face component for a curved surface input.
Cheers,
Charlie
Thanks for bringing this up, @charlie.brooker .
I got the chance to open your file and you are right that there’s a significant issue here, though it was more than just a difference between Rhino 7 and 8. I was able to get some of the geometries to not translate in Rhino 7 if I used a coarser tolerance of 1 cm.
In any event, the fundamental cause of the issue is some code that I added 6 months ago to improve the translation of planar geometries with curved edges. I was just finding a lot of cases where Rhino was representing things with NURBS curves that were essentially linear and so I added a step to perform curvature analysis on the curves before I decide to translate them as either a single line or a subdivided line. The issue was that I didn’t realize how 2-degree arc-like curves would behave with this check since they have the same curvature everywhere and I can’t simply evaluate a max curvature like I can with all of the higher-degree NURBS curves.
I added a better way of handling the 2-degree arc-like curves here:
… and I verified that all 4 of the geometries in your sample translate in both Rhino 7 and Rhino 8.
You can get the fix on your end now via the LB Versioner and I will make sure that it is included in the next Pollination installer.
