Hello
Im relatively new to subd in rhino and I have adapted a workflow for a signet ring online to have a bezel for a stone up top. I offset inward instead of outwards and everything seems okay but my bridging is failing. I tried a simple offset inward with a sphere with faces removed (open not solid and it bridged fine. I flipped normals but it didnt seem to help. Im not sure how to interpret the result. Im hoping someone can see the problem
It is always better to upload a file, so that forum users can examine what could cause the problem, or what you did wrong.
Bridging takes place between faces. So you can do it like below. Instead of your yellow curve, create a SubD surface from it, then bridge for your chamfer, crease. Then just delete the superfluous faces. Or, as shown on the right, extrude the edge loop and crease.
I haven’t been keeping up with things but, Subd loft might work. Worth a try.—-Mark
Thanks for responding .The yellow curve wasnt used in the operation. I was trying to bridge the sides of the ring and the rim at the top to the inside table as per the red marks below
What worked in completing the operation in the end was unchecking join.
I then had to stitch the parts everything together as i had naked edges at the seams..There were strange mirroring issues at play also: the stich would not follow the mirroring but vertices being moved would for example. Perhaps that meant to be that way.
Im wondering what might be complocating the bridge operation (quad flow was good ) and I suppose I am curious as to why someone might not want to join in a bridge operation?
Dear @David_Parle
if you want more feedback on your questions it s impossible to help from a screenshot - so please upload a rhino / .3dm file.
you can drag and drop them in the text edit/writing frame while you type…
… also check your models in boxmode.
toggle boxmode/smoothmode with the → (tab) key.
i recommend to have the starpoint / extraordinary not at the edge:
minimal number of faces
a good rule of thumb is to have min 8 arround faces if you want to design a closed “roundish” but personally styled edge. The minimum version follows this rule. Starpoints at edges will limit later fine-tuning workflows (bevel or similar)
to be able to influence inner curvature: you will need 2x2 faces at least.
and with the attached file, I can repeat your bridge Issue.
_offsetSubD (solid = no)
trying to bridge the oben edges fails.
SignetRingSubD_tp_00.3dm (3.6 MB)
the issues look similar to what I reported nearly 2 years ago here:
kind regards - tom
Thank you for the notes on poly density . It reassuring to know there is a precedent for this bridge issue and its not just my workflow. I guess ill have to play with either breaking the mirror link prior to bridging or just constructing with history off for some steps.
Looks like Bridge with Join enabled isn’t able to work with the symmetries here. If you disable the “Join” option in the Bride dialog, the result are correct and you can then join the three SubDs. Join is also unable to preserve a double reflection symmetry so you will lose that in the Join, but the result is correct and symmetries can be reapplied later.
Or RemoveSymmetry, do the Bridge with Join, and reapply the symmetries.
I’ve added some work for myself on the pile:
RH-92171 Bridge: Remove symmetries when Join is enabled
RH-92170 Bridge: Deletes geometry on model with double reflection
