modeling a belt?

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 From:  suman
5276.1 
hi guys

how can i modeling this belt?

many thanks for your help


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 From:  bemfarmer
5276.2 In reply to 5276.1 
You could take picture from the front, and from the top, and use view image, to create some guide points.

Measure some angles...

Take a helix, and do some moving and twisting?

The figures can be made separately and added on.

It is a knot, so check out knot modeling...

EDITED: 23 Jul 2012 by BEMFARMER

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 From:  Frenchy Pilou (PILOU)
5276.3 
Draw a straight blue curve on the ground with some points
Extrude it
Show Points
Now you have just to move the points of the blue curve as you want!

At the end you shell it, add some d├ętails

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 From:  bemfarmer
5276.4 In reply to 5276.2 
Here is a trimmed trefoil knot, made with the ToroidalKnots script.
Did a sweep with a rectangle.
Did a trim with two rectangles...got some unwanted extra "projection" cuts also.





EDITED: 2 Apr 2015 by BEMFARMER

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 From:  Mauro (M-DYNAMICS)
5276.5 In reply to 5276.1 
Hi suman

quick example:

1)model your belt flat then add decorations and melt together via boolean union
2)draw a straight line on the belt (blue)
3) draw a curve that match your curved belt (red)
4) use the command FLOW:select flat belt,then blue line,then red line like target and will appear your belt bended




see my 3dm example attached below..hope this helps


M

EDITED: 29 Jan 2015 by M-DYNAMICS

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 From:  Michael Gibson
5276.6 In reply to 5276.1 
Hi suman, I hope the above gives you some ideas on how to approach it!

What you are showing there is a pretty advanced and difficult project though, because of it's "all swooping around" type shape - you'll need to be editing control points in multiple views to form the 3D curve paths - you won't be able to construct it only with 2D curves alone and that's what greatly increases the difficulty level here.

Like Mauro shows, Flow can be a good method for mapping some initially flat decorations onto the curved result, if you want those pieces to follow the curved contour of the target shape. There are some other links of examples and descriptions of using Flow (which is a new command for MoI v3) here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=4856.2

- Michael
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 From:  suman
5276.7 
many many thanks for the good help.
we love you guys.

@ M-dynamics:

I can not find command flow
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 From:  Frenchy Pilou (PILOU)
5276.8 In reply to 5276.7 
Flow
It's only on Beta V3 for PC or V2.5 , Beta V3 for Mac
Menu Transform / Deform/ Flow
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 From:  suman
5276.9 In reply to 5276.8 
aaaaaah ok..........thanks ;-)
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 From:  suman
5276.10 

hi all

i am again with my belt :-)

when I apply flow, afterwards I can
the belt still turn in the cross section?

you know what I mean?

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 From:  Michael Gibson
5276.11 In reply to 5276.10 
Hi suman,

> when I apply flow, afterwards I can
> the belt still turn in the cross section?
>
> you know what I mean?

I'm sorry but I don't understand at all... Can you please try to describe this a bit further?

- Michael
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 From:  suman
5276.12 In reply to 5276.11 
hi michael
the belt is flat. I mean if I can turn it so that it has the position as shown in the picture.






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 From:  Michael Gibson
5276.13 In reply to 5276.12 
Hi suman, how did you model the curled up belt that you are showing there with the rotation arrow around it, was it done using sweep or something like that?

Or are you using curve-to-curve flow for the result that you show there?

If you are using curve-to-curve flow and the twisting of the result is not what you want, you may want to instead construct a sort of ribbon surface using something like Sweep - to do that you would draw in a line along your path and use Construct > Sweep to generate your target surface, then draw a base plane underneath your starting shape and use surface to surface Flow for deforming the belt (that's where you select a base surface and a target surface rather than curves), and you can rotate the line before doing the sweep to control the twisting.

It could be easier to help you if you would post a 3DM model file with your current results in it, that would make it easier to understand what you're currently doing.

- Michael
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 From:  Colin
5276.14 In reply to 5276.12 
Hi suman,

You can create the "belt" by doing Sweep by having a Profile at each end.
See 3DM file.

HTH, Colin
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 From:  Michael Gibson
5276.15 In reply to 5276.12 
Hi suman, here's an example of the kind of thing you'll need to draw on the left here - here I've drawn a path curve starting in the Top view, and then turning on its control points and adjusting them (particularly in the z direction to adjust their height), to get a sort of looped path curve. Because of the edits to the points in the Z direction the path curve also goes up and down, it's not just a 2D flat curve.

Then in order to control the sweep you will probably want to place several line segments along the path and these line segments will be used as the profile curves for a sweep. Make the line segments all copies from a single one so they're all the same length and adjust the rotation of any one of them by selecting it and running the Transform > Rotate > Rotate Axis command. The "Rotate axis" command asks you for a line for the pivot to rotate around, make sure both "Straight snap" and "Object snap" are on so that you can make that rotation axis line snap on to the path curve tangent so you can rotate the lines around the curve tangent at their base points.

This is all some pretty advanced 3D editing techniques and so it may take you some practice to get used to building 3D curves and editing the rotation of lines along a 3D path like I've described here. Also it can help to use History - to do that do the sweep and then edit the path and/or lines after the sweep is in place, then the sweep will update.

The way I did it, is I started with just one single line at the start of the path and did the sweep, then compared the banking to your desired screenshot and added in some more key lines in areas where the default banking was not very close to the kind of banking that you wanted.

Now with this surface in place you can use "surface to surface" flow to apply deformed shapes on to it.



- Michael

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 From:  Michael Gibson
5276.16 In reply to 5276.12 
Then in order to do the Flow, you need to set up a base plane off to the side, with objects to deform resting on that base plane. You'll select the objects to deform, run the Flow command, then select the base plane at the first prompt, and the curled sweep surface at the second prompt where it says to pick the target surface. The locations where you pick on each surface is significant, click in a similar spot near the end of one edge on both surfaces when you pick them. So the setup for the flow would look something like this with the base plane under your objects to deform:



Then the result is like this:




It can be helpful to use the "UnwrapCurve" plug-in to get a good length for the base plane so that it will match the actual length of the twisted surface and not do extra stretching or compression: http://moi3d.com/forum/index.php?webtag=MOI&msg=5136.1

The prep work for making the curled surface is probably the hardest part, since that involves making adjustments to both the path curve and all the profile line curves on it using 3D manipulation tools rather than only doing 2D work. But once you produce a base surface that is curled how you want it then you can use Flow and that will let you apply all kinds of flat shapes onto it so for the individual shapes you get to do those as flat 2D shapes. So this approach at least helps to condense the 3D type work to the sweep construction.

Hope this helps illustrate what you would need to do!

- Michael

EDITED: 25 Jun 2013 by MICHAEL GIBSON


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