jabulani ball

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 From:  hamid (HAMIDO)
3798.1 
Hi all I'm new to MOI3D and I'm trying to model world cup ball I dont know how to do it any help please.


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 From:  Frenchy Pilou (PILOU)
3798.2 
http://moi3d.com/forum/index.php?webtag=MOI&msg=2140.46 ;)

and type football in the search engine, maybe there are anoter thing
but with this one you have the concept :)
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 From:  falcon76
3798.3 In reply to 3798.2 
Unfortunatly Jabulani is very different. Here is a 3DS Max Tutorial with texture.

http://forum.german-mentalray-wiki.info/viewtopic.php?f=41&t=2311424

You could learn something but the process it's very different in Moi.

Luca
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 From:  Michael Gibson
3798.4 In reply to 3798.1 
Hi Hamid, that's a pretty difficult model to try and start with - it's not really an ideal candidate model for the NURBS modeling techniques that MoI uses.

I'd recommend learning MoI by making something that is more well defined by 2D plan curves. NURBS modeling tends to work the easiest with models that can use 2D curves to define them and use as profile to cut holes, etc.... The ball model you want to create does not really fit in that category.

You could still try to model it in MoI, but it will use a variety of much more advanced tools (like doing a lot of projection of curves on to a sphere) and won't really be using the easier and faster areas of MoI's modeling tools.

Or do you possibly have any kind of 2D plan drawing available of some of the elements of the Jabulani ball, like some of the patterns arranged in a 2D drawing instead of only the 3D image of it? Those could possibly help.

- Michael
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 From:  Frenchy Pilou (PILOU)
3798.5 
:)
I had not my glasses so effectively that is not exactly the same geometry !
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 From:  hamid (HAMIDO)
3798.6 In reply to 3798.4 
Hi all for your help ,I have got the ball in my hand and there is four similar pattern . I still c'ant figure it out
is my son how bought this ball and his telling me to model it for him because ...... , I will knock his head when he come back.
thank you.

EDITED: 4 Oct 2010 by HAMIDO

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 From:  Michael Gibson
3798.7 In reply to 3798.1 
Hi Hamid, so again I must caution you that this is a complex model and not at all a very good first model to attempt to learn how MoI works. You have to use quite a lot of more advanced techniques to build this kind of model.

But I have included here a version that I created, the model is in the attached JabulaniBall_3DM_model.zip file, and I've tried to show some of the stages in how the model was constructed, although there are quite a bunch of little details that will be difficult to describe well in a short time.

Here is some idea of the steps.

To start with I drew the 2D flat pattern of the panels, but I arranged them a little differently, so they were set up like this:



Then I used the Transform > Rotate > Rotate Axis command to pivot the outer pieces upwards along the edge they share with the center piece, kind of like swinging them on a hinge. This is the same technique used in the previous post for making a dodecahedron that Pilou posted above, see that for an animation and description of the technique: http://moi3d.com/forum/index.php?webtag=MOI&msg=2140.46

But basically the key thing is to create 2 vertical circles that will then give you an intersection point so you have a place to snap on to during the Rotate Axis command to give you the specific rotation angle that's needed for the pieces to exactly touch one another.

That's actually done just on one of each kind of piece, then others can be created by Transform > Array > Circular, since there is a symmetry to the pieces.

That then gives a kind of wireframe outline of the panels, which looks like this:



Then I found the center point of that by turning some of those polygon curves into planar faces by using Construct > Planar, and then drawing in lines from the center of the face along its face normal and finding where they intersected.

Then I drew a sphere from that center point, and projected the polygons on to it. This is one of the tricky parts, because to get the best results later on you want to just pick a couple of good pieces that don't have the seam edge of the sphere running through them, and then carefully replicate those 2 good pieces to the other spots, that's done again using Transform > Array > Circular for a few of them, and then using Transform > Orient to place the top and bottom ones.

That then gives an object made up of panels where each panel is a piece of a sphere like this:



Then I selected all those sphere fragments and thickened them into solids using Construct > Offset > Shell.

Then I rounded the edges of each of those thick pieces using Construct > Fillet, to get the final result:




But I would really encourage you to work on some more simple models initially to learn how MoI works instead of this one, this one forces you to use quite a variety of tools and also some of the more advanced tools right from the start.

Instead, to learn MoI try going over the video tutorials here:
http://moi3d.com/2.0/docs/tutorials.htm

Those show how to construct some more simple models so you can get more of a feel for how to use MoI for building models that are more like mechanical parts instead of things that involve more 3D wrapped patterns like the ball.

- Michael

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 From:  falcon76
3798.8 In reply to 3798.6 
As far as I remember (and as showned in your picture) there are only two different tiles.

It's cheating, but if you want I can give you the model I've already done with 3DS Max.... But it is not the same for your son ;-)

Ciao
Luca
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 From:  Frenchy Pilou (PILOU)
3798.9 
Tricky :)
How do you find the good proportions of the polygons from the triangle?
Other measures proportions can be fit the sphere?

EDITED: 4 Oct 2010 by PILOU

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 From:  Michael Gibson
3798.10 In reply to 3798.9 
Hi Pilou,

> How do you find the good proportions of the
> polygons from the triangle?

I believe any proportion you pick will still make a solid, the proportion you choose will just control the proportions of the pieces in the solid.

For example here with larger triangles and smaller "truncated" spots:



That makes a solid like this:




I guess this is similar to a Truncated tetrahedron:
http://en.wikipedia.org/wiki/Truncated_tetrahedron

- Michael

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 From:  Frenchy Pilou (PILOU)
3798.11 In reply to 3798.10 
THx!
So we can see from the Wikipedia page the next new model of Fooball :)
---
Pilou
Is beautiful that please without concept!
My Gallery
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 From:  hamid (HAMIDO)
3798.12 In reply to 3798.7 
Hi thankyou Michael for the ball there is a lot technics here and I'm new to it, I will show it to my son later today
his mother is calling me stupid I was banging my head on the wall last night and if he doesn't like it I will take him to the river
thankyou again
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 From:  lyes (BLYESS)
3798.13 In reply to 3798.12 
Hi Hamid here is a way how to do it:
on top view make triangle with polygone tool ,
one small one add pts to it
make hexagone ,
snap the cpts to hexagone end points
make Z blue axe
rotate (make copy) triangle and pink shape,snap to Z blue axe




make sphere in the center RED PT (red point is the int off the blue axes )
Project the pink shape to sphere ( closeste pts )
circular array 3 on Z axes
make red lines and project to closeste


draw circle on shpere and project closest ,circular array.
--------------------------------------------------------
new shape easy to do with 3 sided pyramid ( Tetrahedron ) and sphere
1 intersect ,draw yellow polyline project closeset
2 chamfer the pyramid project closeset edges on sphere . intersect the sphere and the pyramid

EDITED: 5 Oct 2010 by BLYESS

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 From:  hamid (HAMIDO)
3798.14 In reply to 3798.13 
Hi Lyes thank you for your help my son is happy with Michael ball , its hard for me all that geometry in 3d ,
he like MOI3D and is learning it.
thanks all.
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