Spray Can Cap... Argggg

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 From:  Rich_Art
5012.1 
Hi All,

I'm trying to model a very simple spray can cap. No problem to make the model but there is an indention on the top part of the cap which has a curvation in the Z and X direction. (Z and Y in Moi3D)
What is the best way to model this.
I made the attached cap with a simple curve and a revolve. Simple of course but I can't find a way to make the dual direction curvation....I is Probably easier than I think but atm I'm stuck..









Peace,
Rich_Art. ;-)

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 From:  coi (MARCO)
5012.2 In reply to 5012.1 
Hi there..

you could LOFT the two upper curves



or with one additional curve to have some control over the surface..




- Marco
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 From:  Rich_Art
5012.3 In reply to 5012.2 
Whaaa lol never tried to loft them. Never thought a loft works with 2 of that kind of curves.

Thanks it works good now...


Peace,
Rich_Art. ;-)

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 From:  Mike K4ICY (MAJIKMIKE)
5012.4 In reply to 5012.3 
Hi Rich_Art!

You can also make a Network surface to represent the curvature of your top shape, but a little larger than the diameter of the cap - then Boolean Difference (or Boolean Merge) that away from the revolved cap.
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 From:  Rich_Art
5012.5 In reply to 5012.4 
Thanks.. :-) I really have a hard time not to think like a Subd modeler....

Peace,
Rich_Art. ;-)

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 From:  Rich_Art
5012.6 In reply to 5012.5 
Ok I'm ready...


Peace,
Rich_Art. ;-)



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 From:  Michael Gibson
5012.7 In reply to 5012.1 
Hi Rich_Art - it looks like you've got it solved now, your final render looks great!

So yeah usually the best workflow for something like this will be to construct a kind of broad surface that has the form that you want and then use that surface as a cutting object to slice off some material from your base solid.

If you wanted something that was totally straight then just slicing with a 2D curve would do the job for that, and it looks like that is what you did initially? That was actually the right idea that you should slice the end off but if you want a more sculptured type end you will need to model that as a surface and then use the surface as the cutting object rather than using a 2D curve as the cutting object.

That would look something like this - here I drew in 2 curves, then moved one over a bit and mirrored it:



Then Construct > Loft can be used to build a surface going through those curves:



Now select the main solid and run Boolean difference, and select that lofted surface as the cutting object, that will slice the solid into 2 solid pieces, basically leaving the imprint of the surface:



Then delete the portion you don't want:




Usually when you want something that is not a straight cut you will need to do some surface construction like this to make some of your cutting objects rather than only using 2D curves. But of course if you want straight cuts then just use 2D curves for those since that saves some surface construction steps. So it tends to speed construction by quite a bit if you do use 2D curves when you are able to.

The same technique can be used to put rounded caps on the ends of pieces as well, a few different examples of that:
http://moi3d.com/forum/index.php?webtag=MOI&msg=4296.5
http://moi3d.com/forum/index.php?webtag=MOI&msg=606.4
http://moi3d.com/forum/index.php?webtag=MOI&msg=2909.2
http://moi3d.com/forum/index.php?webtag=MOI&msg=2666.5


So anyway you were like 95 percent of the way there and using the right strategy, you just needed to make a more custom contoured surface for the cutting object rather than a 2D curve, but you had the right idea to build a solid and do a boolean in the first place.

- Michael

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 From:  Rich_Art
5012.8 In reply to 5012.7 
Thanks Michael.. I appreciate all the great support you give your customers.

Your solution is easier indeed. I'll keep this in mind in a next project...


Peace,
Rich_Art. ;-)

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 From:  Mike K4ICY (MAJIKMIKE)
5012.9 
Rich_Art! Great job on the "ultimate spray-paint can"!

When do expect to patent it, and make yourself unbelievably wealthy? ;-)
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 From:  Rich_Art
5012.10 In reply to 5012.9 
Yeah but to bad it is not my invention. I once found an similar Spray-paint Can image on the net. So it won't make me rich and perhaps I have to pay copyrights now. LoL

Peace,
Rich_Art. ;-)

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 From:  Rich_Art
5012.11 In reply to 5012.7 
I've made e new cap wit your solution Michael. Works lovely





Peace,
Rich_Art. ;-)

EDITED: 17 Mar 2012 by RICH_ART

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 From:  FlashFire
5012.12 
My son Ethan and I had a fun go at this ;)
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 From:  Michael Gibson
5012.13 In reply to 5012.12 
A happy spray can! :)

- Michael
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 From:  Rich_Art
5012.14 In reply to 5012.12 
Ha that is a nice one...

Peace,
Rich_Art. ;-)

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