Hi all, I am trying to close the naked edges (about 300-500+ when I exploded) of the KCS Hull that is rudderless, does anyone know what I should do when there are that many naked edges? I have uploaded both versions of the hull in rhino 7 and 8. All guidance is appreciated!
KCS_geometry_rudderless_fixed.3dm (1.4 MB)
KCS_geometry_rudderless_fixed_8.3dm (1.4 MB)
Where did this model come from? Did you make it? Your file tolerance is 0.001mm, while I don’t think a single edge on it is close to that.
Hi Jim, I took over the work from a colleague, as I am quite new to rhino, I believe that my settings are not ideal
hi @Mia6
the answer to how you can get rid of your naked edges is very simple, the entire geometry is just such a mess that i can not believe anybody with more than 3 weeks of Rhino experience has had his hands on it.
this one almost seems like an easy fix, the entire surface seems to have been moved (accidentally) while that can be fixed fast, it still does not close up because it was simply modelled with zero knowledge
what a wonky surface, its almost funny to look at it… but yeah i get it its not funny but wow is that a mess…
also forget the settings, 0.001 mm is very tight but whatever that will not help you in getting this model back together since the entire thing just has to be made once more, properly, at least start where the surfaces are good and try to rebuild those which are completely out of whack, there is nothing more i can say/help at this moment. if you run into specific issues feel free to ask once more.
edit: also those surfaces here are horrifying, i dont even know how you could encounter that, was that modelled in Rhino? i have had some weird geometry coming from other apps like solidworks, which are to some degree unfixable because the software just cheats its way through life like nothing else making Rhino look bad because it just reveals the everything behind the blindfolded crap other apps produced making it look like Rhino does not work properly.
this surface looks super odd, it appears to have been trimmed inwards, if you untrim it the surface looks normal but i have never seen anything like it… i assume it has folded into itself but i am unwilling to find out more here.
In other words: Nice from far, but far from nice.
I agree there is little you can do to fix it. To me it looks as if the file tolerance was high to start with and changed later to a lower value. Or the edges were forcefully joined with JoinEdge.
file tolerance for a boat that big, being 0.000039" is probably a bit too strict.
although seeing some weird anomalies
these geometries will need to be reengineered.
I’d guess some sweep2 operation with a singularity refreshed by history afterwards having changed the sweep rails. (or even worse: excessive use of -_joinedge)
Also I don’t understand why the person bothered to draw both sides instead of mirroring.
It’s simply a process that takes time. There’s many ways to do it. Being the actual designer helps with the process relative to intent.
If it is the KCS Hull. You can probably find a better version of the hull. When I worked at a towing tank we had a good geometry of that hull.
/Astrid
Generally, the going is easier the less constrained to your inner parent curves your surfaces are. I should think that fair and hydrodynamic would not overly constrained.
Counting from the right in the previous image, I see what looks like a hard seam at the 5th vertical station, about middle. It might be un-matched?
If you have created curves and intersected and trimmed them to form a shape comprised of several surfaces, it might be better to see how much can be done without trimming the surfaces. In other words, see how you can accomplish with only only your parent curves. Sometimes it can be tricky to get Rhino to make something or half of something without excess splits or surfaces (nudge-nudge.)
That said, the bow and prop protrusions will likely need add-ons.
[As a lark, it might be interesting to mock one of these up in SubD, and then convert it to NURBS, and then see how the converter, which often has good ideas–does it.]
Hi @encephalon, we obtained this model (kcs hull_x_t) from starccm+ tutorial files haha, we had to remove the rudder as we treat its resistance as negligible during our simulation. I guess in the process of removing the rudder, and patching up the empty space might have messed up the geometry as well…Im not too entirely sure if it was originally that messy.
Hi @Gijs , I am quite a novice at rhino, so JoinEdge was definitely one of the tools that I tried but failed haha, as for the file tolerance, I do hope to understand better on how tolerance affects my view of the edges
Hi @benedict, I did attempt with sweep2, but sometimes the error of how some curves can’t be joined pops up and I went back to square one…
Hi @Astrid_Kjærbølling , yes it is the KCS hull, we obtained it from the starccm+ tutorial but we edited the model to remove the rudder and possible screwed up the geometry from there on due to the lack of technical expertise…
Hi @Brenda , thank you for the advice, I am experimenting with the features but have yet to achieve a desirable result
Hi @lander , wow that is just amazing…thank you! May I know what you did? Typically the most common errors I encounter were that my curves cannot be joined, with surface creation features, or that there are “no bad surfaces” etc.
Hi Mia
Try google the geometry and you should be able to find a good hull. ( I unfortunately cant share the one i got)
Another ting to notice is that in the new star CCM version, siemens adapter is the only importer. It is a lot more sensitive to nakede edges , double curved surface etc. Before the new version I always used HOOPS importer since it could also ready planar surfaces and was good with the way i could name surfaces in star. We have made siemens aware of the issues but how long it take for them to fix I dont know.
I hope you succed in fixing the geometry.
/Astrid
here’s an example
and that’s about 33.33% of what I did.
it sounds like you just dropped it in without thinking about it twice, checking out the responses to the thinking you seem to have neglected so joyfully. neat method to spend everybody else’s time…
but i guess you found your own answer then 
