How to make good smoothing?

Hello, I have such geometry:
2017-11-16_203029
1.3dm (168.7 KB)

How smoothly to close a hole? I tried the most different options, but nothing is impossible… :sleepy:

Hello - I don’t say I love this so far, but I think the general surface arrangement is an OK starting point. (file attached)
1_PG.3dm (160.0 KB)

-Pascal

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Hi Pascal and why Patch doesn’t work with an accuracy of 0.0001? More precisely the geometry created through Patch doesn’t want to unite with surrounding geometry.

Hej Modeler3D,

your curves and surfaces are far too complex to achieve good results. You can do it all with degree 5 curves with a single span except the “squashed nose curve” at the tip, where your model is open. If one would have some more of the surrounding geometry, one could understand better, why the surfaces in your file are so overly complicated.

Could you attach the file? That it was clearer…

to get an estimate result, patch could be still useful at least to get some curves from it to rebuild it further. when you play with the stiffness something around 10 and using a high amount of surface spans you actually get something which is almost there. using a stiffness lower than 10 the surface bulges up, higher the overall shape gets better but the corners match up even less. so its a compromise between 2 not working directions to get the best preliminary result.

here i used an extracted isocurve seen as red and one on the bottom to make a blend curve (yellow) which i used additionally for the patch. if you have a new computer you can fiddle a bit more on my 8 year old computer that took a lot of time. i guess it will not be possible to get a joinable edge with patch only.

i suggest a configuration out of 4 x 4 sided surfaces which i drew by hand quickly. maybe this might work out. for this to work properly to match the surface you may also have to rebuild a part of the surface to the right which consists out of 3 surfaces to get a matchable edge.

i include you a file maybe you can use it

1.3dm (2.3 MB)

That is true. Though it’s difficult to get a good surface without naked edges on first try, I suppose extracting isocurves for other way to build curves is a good help.
I’ll try it next time.
Thanks for a new workaround. at least for me.

Zebra of your geometry - it is bad :expressionless:
2017-11-17_165026

please read what i wrote before you test zebras on a result which is not meant to be a proposal at all but a preliminary shape to extract curves for further development from. or do i have to write in russian for you :smiley: if you need it stiffer you can increase it to 20 if it helps but dont use that surface as a end result thats what the message was about.

But how to use the taken curves? How to create a beautiful surface?

I will be glad! :smiley:

there are many options i guess you would have to try for yourself a few approaches. most important is to extract some curves clean them up and to get them attached to the surrounding surfaces. then use any means like edge srf or whatever to get the surfaces as suggested. you would have to use match surface to get them properly aligned anyway. in best case you can use sweep 2 or network surface to get surfaces witch are partially matched already. once you have acceptable curves set up the rest should not be too difficult anymore. you can also change the layout as suggested, i only tried to avoid singularity surfaces and offered a layout with 4 sides surfaces. i am sure there are other ideas which could work.

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It is clear, but however I tried to play with curves, created on them surfaces - nothing good still was impossible to me…

Somebody can lay out a qualitative surface (at whom something has turned out).

@Toshiaki_Takano

Here I experimented…
2017-11-18_145518
2017-11-18_145544
Set of manipulations, the tool was often used Sweep2. And there is in general some useful information on this subject?

Your own last example shows much simpler boundary conditions, compared to the one you posted originally.

It would have helped if you had posted more of your original model so we could have seen, why the curves and surfaces were so odd to begin with. Like others have pointed out, it’s all about beginning with a good patch layout concept before starting to model.

Hi, I poorly understand - as it is possible to use Patch for receiving some curves for further modeling :roll_eyes:

the curves you get from the patch you work further till they are good enough. anyway look here in the XNurbs Topic, he took your model and tried it out in case you did not follow that one. i am not very happy with the result but i am sure you can adjust it still with constraints.

It is clear, but me there was no wish to use any external plug-ins.
All this is very difficult, there is some video on the Internet where it visually is considered? :face_with_raised_eyebrow: Process of creation of similar difficult surfaces…

its sure not easy and will take quite some time, i tried a few times but did not succeed yet and i am sitting several hours on it already. i really have to cease it now i cant waist any more hours on it. you geometry is not smooth to provide a good starting point. anything which this circumstances will be a lot of trying out. and manual smoothing around.

i had a good start with 2 network surfaces with a singularity ending with multiple matching and an average matching and merging the 2 surfaces with deleting some knots and applying smooth locally, but i cant split the surfaces anymore it appears deleting knots produces a hole of some sort that the algorithms cant grab it anymore. cant even cut it with its own isocurve… also does not intersect… with its on isocurve so somthing got fishy and i would need some more matching. its not easy and this is as far as i can help you sorry.

this time i will not give you my tryings because you will use zebra again and complain how bad it is :wink:

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After a while I have achieved such result: :slightly_smiling_face:
2017-11-18_205007
2017-11-18_205113
1.3dm (1.2 MB)

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I rebuilt your curves and surfaces and this way one gets a near G2 result fairly quickly. But as others have said, the original geometry is fairly messy to begin with. Don’t have more time for this, so good luck!

Messy curves and surfaces.3dm (1.0 MB)

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