error sweep in moi

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 From:  Anis
2090.1 
Hi guys....

Advice please....
I am trying to use sweep in moi to create these object, looks like there is an error in moi. Rhino can do this very well ( from what i know from "a tutorial" ). Below is the screen capture :

thanks
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 From:  max3d (DAVEDAVIDSON)
2090.2 In reply to 2090.1 
i dont knwo what the issue is with sweep i can see the change in the mesh though. it works better if u use network instead of sweep. if that helps
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 From:  Frenchy Pilou (PILOU)
2090.3 In reply to 2090.1 
Curious that works fine for me with your file with sweep & circles as 2 rail or lines as 2 rail ??? maintain Hight or not!
(beta 21 sept 2008)

EDITED: 17 Oct 2008 by PILOU

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 From:  Anis
2090.4 In reply to 2090.2 
Hi dave...

network - work, but the result is like image below, maybe we need to add more curves, but its not easy to maintain the tangency :



@pilou ,,,

yes, with sweep in v1 work also, but the result not smooth like image from rhino.
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 From:  max3d (DAVEDAVIDSON)
2090.5 In reply to 2090.4 
ahhh didnt notice that
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 From:  manz
2090.6 In reply to 2090.1 
>I am trying to use sweep in moi to create these object

You posted concerning this some time ago, but thought you had resolved the problem:- http://moi3d.com/forum/index.php?webtag=MOI&msg=1776.1
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 From:  Anis
2090.7 In reply to 2090.6 
Hi steve....

oh yeah...
I remember those thread, i just cant find the thread when use "search" in this forum.
Yes, I know I can add more curves, but the tangency is not natural. Because the curves added manually. I just want to know another way that can produce more natural tangency surface result like in rhino. Maybe this will for final release of v2 or v3....

thanks
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 From:  manz
2090.8 In reply to 2090.7 
I have quickly built that part of the bottle using network:-


EDITED: 3 Aug 2009 by MANZ

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 From:  manz
2090.9 In reply to 2090.7 
2 rail sweep with scaling rail:-

EDITED: 3 Aug 2009 by MANZ

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 From:  manz
2090.10 In reply to 2090.7 
A G1 blend:-

EDITED: 3 Aug 2009 by MANZ

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 From:  manz
2090.11 In reply to 2090.7 
Last one I have time for:-

A G2 blend:-

EDITED: 3 Aug 2009 by MANZ

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 From:  Michael Gibson
2090.12 In reply to 2090.1 
Hi Anis, this is due to one of the rails being made up of 3 segments.

Currently MoI handles sweeping differently than Rhino in the presence of multiple segments.

If you use Edit/Separate on those rail curves, you'll find this small segment here:



Which as you can see corresponds to the problem area of the resulting sweep.


If you fuse those segments together into a single segment by deleting the control points on the ends of that small segment in the joined-together curve, the sweep should behave better. Also another alternative is to use the Rebuild or FitCrv commands inside of Rhino to fit one single segment to that multi-segment curve.

Network in MoI will also work better for this particular case because it has a similar kind of refitting process done on all of its curves internally.

I have an overhaul of sweep planned for a bit later on in v2 that should address these issues with sweep.

- Michael
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 From:  Anis
2090.13 In reply to 2090.12 
@ Steve...

Are you using this technique ?



@Michael....
got it...
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 From:  manz
2090.14 In reply to 2090.13 
Hi Anis,

>Are you using this technique ?

For the construction lines yes.

For the G1/G2 blends (last 2 pics above), extrude the top circle to a surface and then blend with the the main body.

EDITED: 3 Aug 2009 by MANZ

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 From:  Anis
2090.15 In reply to 2090.14 
Hi Steve...

The problem is that the bottom surface is come from multiple curves ( check my original file on my first post ) :
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 From:  manz
2090.16 In reply to 2090.15 
Hi Anis,

>The problem is that the bottom surface is come from multiple curves ( check my original file on my first post ) :

Yes, but your original surfaces/curves are not good for later blending/constructions. Even in Rhino a 2 rail sweep using your curves will not give a clean/smooth surface.

Rhino:- 2 rail sweep:-



The problem is that the curves for the main body are not all connected to at least G1, so it will cause further problems, even possible problems with output for rendering. It is better for such a simple shape to use a circle or oval and then move the control points to create the correct shape as I did on the examples I posted.

EDITED: 3 Aug 2009 by MANZ

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 From:  Anis
2090.17 In reply to 2090.16 
Hi Steve...

I am never tried in rhino before, thanks for checked it.
When apply fillet i use "circular" ( see below ), I will try to use G1, G2 & G3 and see the result.

EDITED: 19 Jun 2010 by ANIS

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 From:  Anis
2090.18 In reply to 2090.17 
Below is the result use sweep 2 rails :

EDITED: 19 Jun 2010 by ANIS

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