How to smoothly cap this object ?  1-20  21-36

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 From:  mkdm
7928.1 
Hi Michael and all,

i've been looking for a way to smoothly cap this bizarre chair, but i didn't find a decent solution.

I've tried blend-cap, sweep, network, and so on, without success.

May someone help me ?

Thanks and have a good day,

Marco.
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 From:  chippwalters
7928.2 In reply to 7928.1 
Draw a plane which intersects the open end and then trim it with the chair. Next, join the newly trimmed piece at the open end to create a flat end. Join all surfaces. Divide chair in half, delete one half and then mirror the newly capped piece.

The problem is the end is capped flat, which is not what your contours show. Once you have a solid chair with the flat caps, you can then start to boolean cutaway the end parts to sculpt the capped sides so they are not flat.

IMO, it's a difficult seat for a number of reasons. Once you cap, you can't fillet easily because you have too tight corners. You could also loft pieces in place using the existing end profile, and make sure your last loft piece is planar so you can make a flat surface to construct your solid.

If it were I, I'd try and rebuild the chair using lofts. Or else consider using SubD modeling.
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 From:  mkdm
7928.3 In reply to 7928.2 
Hi chippwalters,

First of all i wish to thank you for your suggestions and your considerations.

I tried to follow what you said, but unfortunately without achieve the wanted result...

I know that this, is nothing more then a design experiment and a way to better know Moi's tools, but i'm hard headed :
and i made the experiment that i attach to this reply.

The file that i'm posting here, certainly will never pass any surface continuity test,
but i tried to go in a direction that could be the right one.

First of all i resized the original chair to be 30x bigger, just to have a more realistic size.

In the .3dm file, the object named "Chair1" is the chair with the smooth caps,
while the object named "Chair2" is an attempt to make a some sort of "manual" filleting.

I made the, more or less, smooth cap of Chair1, with the help of Blend and Sweep tools.

I hope that you or Michael, or anyone :), will have the patience to find a better solution, if it exists.

Thanks a lot and have a nice day,

Marco.
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 From:  Frenchy Pilou (PILOU)
7928.4 
---
Pilou
Is beautiful that please without concept!
My Gallery
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 From:  mkdm
7928.5 In reply to 7928.4 
Hi Pilou,

Thank's a lot. It's a very interesting article!

I'm going to take a closer look at it, as soon as possible.

Ciao,

Marco.
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 From:  Michael Gibson
7928.6 In reply to 7928.1 
Hi Marco, I agree with what Chipp wrote above, for things that are kind of organic smooth and blobby all over, usually a sub-d polygon modeling program is better suited than a CAD program like MoI.

For trying it in MoI maybe try lofting it in the other direction though, I've attached an example where I drew in some lines from the side and projected them onto your shape to get some curves, and then did curve blends to make them closed, then used Loft with Loft Style = "loose" through those cross sections.

- Michael
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 From:  Michael Gibson
7928.7 In reply to 7928.5 
And it might be better to not try and loft the protruding section on the bottom back, and instead model that separately and trim an opening between the 2 pieces and use surface blend to connect them. Trying to incorporate that directly into the loft all at once kind of introduces some stress in that area because it changes too abruptly there.

- Michael
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 From:  Mauro (M-DYNAMICS)
7928.8 
Caro Marchetto:you are learning Moi right?so please avoid these sharp corners or weird surfaces that suddendly change direction like these













I tried this way:first i copy all side edges,rebuild to have less seams and mirror,then made a loft to get the chair
so i made few modifications to give a better smooth curvature deleting these surface and did Blend G2 using different bulge values





Now yellow and red edges used to sweep or network to get the cap




That's all i can do,forget to fillet or do Mike's method(sweeping circleson side edges+trim+blend) surface still too complicate

M
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 From:  OSTexo
7928.9 
Hello,

Is this going along the right track?

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 From:  mkdm
7928.10 
Hi everyone,

first of all i wish to thank each of you for the help and the explanations!

1) To Michael :
Thanks a lot for teaching me a different approach.
It's not exactly what i was looking for but it's a good way for me to learn another technique in order to create organic shapes.

2) To Mauro (M-DYNAMICS) :
I followed your method and the result comes very close to what i wanted to achieve.
As wrote by you, filleting remains hard to do and i want to give me a chance to try Mike's method.
Thanks a lot.

3) To OSTexo :
Your result looks very nice and seems very simple to reproduce.
I will try your way and i'm curious to know if this method can lead me to get a more lightweight final object, in terms of number of control points.
But i'm wondering if with your method, the two side caps still preserve a good surface continuity with the chair's body.
Could you please tell me more precisely how did you generate the curves used to create the caps ?

Anyway, thanks again to each of you !

Ciao,

Marco.
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 From:  Frenchy Pilou (PILOU)
7928.11 

EDITED: 21 Apr 2016 by PILOU

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 From:  OSTexo
7928.12 
Hello mkdm,

I used Blend with continuity being G2 with the chair body surfaces. I do think you are running into issues a bit because of your control point placement, you might want to bump it up a bit and readjust some of the points so the blended surfaces don't start folding over themselves.
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 From:  mkdm
7928.13 In reply to 7928.11 
Hi Pilou,

It's a very nice rendering !

Is it based on the suggestions given by OSTexo?

Anyway, it seems very close to what's my goal.

I hope to try to build a new version of the chair, made with more smoothed curves, and therefore, with better surface continuity, especially in the filleted areas.

Thank's for all and have a nice day,

Marco.
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 From:  mkdm
7928.14 In reply to 7928.12 
Hi OSTexo,

> I do think you are running into issues a bit because of your control point placement,
> you might want to bump it up a bit and readjust some of the points so the blended surfaces don't start folding over themselves.

Thanks for this suggestion and i hope to build a new version of the chair made by better relaxed and smoothed source curves.

Could you please post the .3dm file of your version of the chair ?
Just in order to have a good starting point...

Thanks for all and have nice day,

Marco.
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 From:  Frenchy Pilou (PILOU)
7928.15 In reply to 7928.13 
I have not modified any curves! Used all functions of Moi! :)

Maybe not perfect for building (your curves are too abrupt) but sufficient for rendering!

EDITED: 22 Apr 2016 by PILOU

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 From:  mkdm
7928.16 In reply to 7928.15 
Hi Pilou,

Thanks a lot for your detailed explanations!

Ciao,

Marco.
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 From:  Frenchy Pilou (PILOU)
7928.17 
Seems this can works! ;)

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 From:  BurrMan
7928.18 In reply to 7928.1 
Here's a method from your first file to keep an angular look and use fillets to smooth the edges. (I also fixed the lack of continuity in the blends first, like others)

EDITED: 22 Apr 2016 by BURRMAN


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 From:  mkdm
7928.19 
Hi everyone!

I sincerely wish to thank each of you for your help and your ingenuity!

A special thanks go to BurrMan for his video tutorial.

In order to become better skilled in Moi, i'm trying all of the different techniques and approaches, that you showed me.

I'm experiencing even that every minor change to the different procedures,
leads me to a very different final result, especially regarding to the surface continuity.

Merely born as an accidental modeling study, thanks to your suggestions,
this "chair" is becoming a good and unexpected workbench.

My actual goal is to become sufficiently accustomed to dealing with
solids made by a mix of sharp edges and g2 smoothed areas, with or without filleting.

Thanks again to all of you and have a nice night.

Marco.
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 From:  Frenchy Pilou (PILOU)
7928.20 
Another solution without modify curves! :)
LineWeb: http://moi3d.com/forum/index.php?webtag=MOI&msg=3666.1

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