Smooth transition  1-20  21-40  41-60  61-68

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 From:  DannyT (DANTAS)
2140.1 
Hi All,

I managed to get the best possible smooth transition surface between these three surfaces with the current tool set, it's not perfect and I'm not sure if something similar came up in the past, so I was just wondering how the rest of you would tackle this and what other tools from other (NURBS) apps out there would do this easily?


Cheers
~Danny~

EDITED: 7 Nov 2008 by DANTAS


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 From:  Frenchy Pilou (PILOU)
2140.2 In reply to 2140.1 
seems easy ;)
Sorry! Gordon (in french) = Network !!!



EDITED: 7 Nov 2008 by PILOU


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 From:  DannyT (DANTAS)
2140.3 In reply to 2140.2 
Yeah I thought that too Pilou, but hide the edges and it's not so smooth :(
I'm also aiming for tangency to the 3 initial surfaces. I think in other apps, there is like a surface patch tool that does the job, but I'm not sure.
I used a different method, I just wanted to see if anyone else comes up with the same method or better.



Oh yeah, being with this forum you tend to learn some technical French terms, so don't worry I knew what Gordon was ;)

Cheers
~Danny~
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 From:  Anis
2140.4 In reply to 2140.3 
Hi Danny, interesting.... :)

Below fill surface inside swx :



Gordon = network

-Anis
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 From:  Lemo (LEMONNADO)
2140.5 In reply to 2140.4 
SWX ???? What prog is that? I tried to google and did not find anything.
Cheers
Lemo
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 From:  TwinSnakes
2140.6 
I'm at work so I cant test..

But, off the top of my head...that's looks like a two rail sweep to me.

-TS-
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 From:  Anis
2140.7 In reply to 2140.5 
Hi Lemo...

swx --> solidworks
and below is the surface mesh....



I dont know how to create those shape in moi

-anis
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 From:  PaQ
2140.8 
Looks like a patch will be the best tool to close this.
Here's an alternative, far to be perfect.

EDITED: 3 Dec 2015 by PAQ

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Message 2140.9 deleted 7 Nov 2008 by MER

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 From:  Anis
2140.10 In reply to 2140.8 
Hi PaQ....

Your tips not tangen but looks good enough....
Below is the zebra strips :

EDITED: 19 Jun 2010 by ANIS

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 From:  Frenchy Pilou (PILOU)
2140.11 
Just a question : why the object of the first post can't be "explode"? (separate)
I want just keep center curves lines an no need of the half cylinders surfaces for have only crossing structure
The only solution i had found is copy move lines needed!
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 From:  TwinSnakes
2140.12 
Any suggestions Michael?
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 From:  BurrMan
2140.13 In reply to 2140.11 
The 3dm file Danny originally posted has many duplicate items in it. try to delete all the extras first to have only one of each.
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 From:  PaQ
2140.14 
Thanks Anis for the zebra, yes I can imagine continuity trouble with the network surface.
Here's an other way



But I get some trouble with the g1-g2 blend, getting really strange result , I will post it a little bit later.

EDITED: 3 Dec 2015 by PAQ

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 From:  Michael Gibson
2140.15 In reply to 2140.1 
Hi Danny,

> and what other tools from other (NURBS) apps out there would do this easily?

Really the easiest way to get a very evenly smooth branching structure tends to be using subdivision surfaces. Tsplines is probably the best for that since it will allow you to generate NURBS output.

An example here:
http://www.tsplines.com/community/casestudies/jewelrydesign.html

However, by using that method you also will sacrifice a bit of accuracy because the straight "tube" parts will be part of the melted-down type surface and will not be an exact perfect cylinder shape like you've got in your actual model here.

But if you are focused more on the blended area than the straight parts, then that is probably the easiest way to get very natural "all directional" blending.



Other than that with traditional NURBS tools you probably need to use an "n-sided patch" type tool that will place a fitted surface that is tangent to the input edges (MoI does not have this tool yet).

But it is best to narrow down the area that will be patched to a small region instead of a large region. I would do that using the method that PaQ showed above by doing some blends between the pieces where possible to reduce the area to be patched, like this:



It tends to be harder for that kind of "N-sided patch" tool to do its job if the edges are bending around a lot, often times that tool works by starting with a best-fit plane and then deforming it along the plane normal to fit the shape. The more than you can reduce the area to be fit to be semi-roughly planar will help with that.

Currently in MoI I think that PaQ's method is the best. And actually the zebra results show a pretty good tangent result there.

- Michael

EDITED: 7 Nov 2008 by MICHAEL GIBSON

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 From:  Michael Gibson
2140.16 In reply to 2140.10 
Hi Anis,

> Your tips not tangen but looks good enough....
> Below is the zebra strips :


Actually it looks pretty much tangent to me from those zebra stripes that you showed there.

You may be confusing tangent continuous with curvature continuous.

When the zebra stripes are aligned with one another but have a kink where they meet, that is tangency. You can see the same thing happen on rolling-ball fillets as well. It is when the zebra strips do not even line up with one another that you don't have tangency.

If you want to have stripes not only aligned but also at a smooth transition - that is curvature continuous which is another level of smoothness beyond tangency.

The main thing with that method is that the filled-in patch is actually a planar surface with no curvature to it, so that part is only going to be tangent to the surrounding blends, not curvature continuous.


Can you please post the model of the result you got in SolidWorks? Since it is one surface it is certainly curvature continuous on the interior of itself, but often those tools only produce tangency where they meet with the adjacent surfaces.

- Michael
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 From:  Michael Gibson
2140.17 In reply to 2140.11 
Hi Pilou,

> Just a question : why the object of the first post can't
> be "explode"? (separate)

You can explode/separate objects that are made up of multiple pieces.

The surfaces in that original post are all just single-surface objects, they don't have multiple surfaces in them to explode out.

Same thing with the curves - those curves are made up of a single segment. Separate can be used to explode a multi-segment curve into individual segments, but when used on a single segment curve it will not have any effect.

I noticed that the original model does have several duplicate pieces stacked up on top of each other, 2 copies duplicated in one spot and 3 copies in some other spots. Is that possibly causing some confusion?

- Michael
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 From:  DannyT (DANTAS)
2140.18 In reply to 2140.15 
Hi Michael, PaQ

>Currently in MoI I think that PaQ's method is the best.
>And actually the zebra results show a pretty good tangent result there.

Yes I agree, that was the final method I came up with as well, PaQ you can use 'Planar' surface also to patch that last bit it is actually flat.

>Other than that with traditional NURBS tools you probably need to use an
>"n-sided patch" type tool that will place a fitted surface that is tangent
>to the input edges (MoI does not have this tool yet).

I Like the way you ended that sentence with 'yet' what other 'yet' tools are you thinking Michael ? :)

Hi Burr,
>The 3dm file Danny originally posted has many duplicate items in it.

Doh! thanks for the pickup Burr, It looks like I left the circular array item count at the default of 8......Corrected!

Thanks to all
Cheers
~Danny~
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 From:  Michael Gibson
2140.19 In reply to 2140.12 
> Any suggestions Michael?

The way PaQ posted here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=2140.8

is what I would suggest...

It does end up with a planar piece in the top part which does not seem to be an unreasonable result.

If you don't want to have a flat piece at the top there, then it will be a lot more difficult, you'll probably need to use a different program that has an N-sided patch tool in it for that case.

If you really want to emphasize very evenly smooth junctures above all else, then possibly t-splines would be best.

- Michael
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 From:  Frenchy Pilou (PILOU)
2140.20 In reply to 2140.17 
>I noticed that the original model does have several duplicate pieces stacked up on top of each other, 2 copies duplicated in one spot and 3 copies in some other spots. Is that possibly causing some confusion?

I have seen that and kill some of them ;)
But that was "the one surface" of half cylinder who pertub me :) (false reflex of the polys of sktechup :)
As Copy / Move lines selected is permitted no problem to use the lines :)
---
Pilou
Is beautiful that please without concept!
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