In the attached file, you can see the red line at the SubD reflect x-axis. However it is going from very thin in the aft ship to quite wide in the foreship. What does this indicate? AFAIK the topology of the SubD is correct. Thank you for enlightening me. SubDShipHull.3dm (578.7 KB) [2025-07-05…

I’ve logged this bug a while back. Symmetry line thickens with z height : RH-87298 See attached, the symmetry line gets thicker the farther it is away from the origin. image.png

I usually switch to box mode, go to point select then check along the reflect plane. There will be a pair of points that need to be merged. Cheers DK

Hi DK, Thank you for your reply. I checked my geometry and so far all seems fine. But maybe I miss something? Anyone else can take a look?

I didn’t look at your file. The symmetry display seems to be thicker when the definition is less dense. @theoutside or @BrianJ surely know more about this… [image]

Thank you Martin, for your feedback. Your answer might be it. And if that’s the case, the blurred thick red line in the foreship is not useful to me. I am curious about Kyle’s reply. @theoutside

I also think the edge should have constant thickness and the symmetry settings should have an option to choose the thickness [image] Thickness setting was requested 5 years ago already… [image] Bug - no symmetry axis of Reflect command in wireframe, technical, artistic, pen mode…

i think its a bug (feature) that got introduced recently, i cant remember having seen this ever before and it also shows up on geometry that is evenly dense either

Thank you Gijs, It is good to know that it is a bug and in relation to the distance to the origin.

[image] I need help with another tricky blend! the same as RH-87298 Symmetry [image] I need help with another tricky blend! do a more “sphere like” cap at the tip [image] @Gijs … no this one is more about zoom -level and size: i would appreciate if the the red shining “edge is reflec…

[image] This topic should not be marked as ‘Solved’ as the issue persists and no one has worked on it yet.

Worked On By is not the droid you are looking for. You look at Assignee, Release Target and State.

Red SubD reflect line is puzzling me

Rhino SubD

brian (Brian Gillespie) October 14, 2025, 11:00pm 16

RH-89840 is fixed in Rhino WIP

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Red SubD reflect line is puzzling me

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