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From: L'Harmonieux Forgeron
Subject: How do you want your eggs today ? [78Kbu]
Date: 9 Mar 2002 13:12:18
Message: <3C8A51FC.B45F3D68@free.fr>
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Just trying a new object: ovus.
It's just a pair of spheres with the right glue...
Thanks to geometry description found at
http://chronomath.irem.univ-mrs.fr/Courbes/ovale.html
--
Non Sine Numine
http://grimbert.cjb.net/
Etiquette is for those with no breeding;
fashion for those with no taste.
Post a reply to this message
Attachments:
Download 'demo.jpg' (77 KB)
Preview of image 'demo.jpg'
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From: Sir Charles W Shults III
Subject: Re: How do you want your eggs today ? [78Kbu]
Date: 9 Mar 2002 13:19:28
Message: <3c8a5230$1@news.povray.org>
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Are you writing a macro for this? I have used two spheres, one round
and one elongated, chopped in half and fused together to make perfect eggs
before. Sounds like a useful and simple tool.
Cheers!
Chip Shults
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip
Post a reply to this message
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L'Harmonieux Forgeron wrote:
> Just trying a new object: ovus.
> It's just a pair of spheres with the right glue...
>
> Thanks to geometry description found at
> http://chronomath.irem.univ-mrs.fr/Courbes/ovale.html
> --
> Non Sine Numine
> http://grimbert.cjb.net/
> Etiquette is for those with no breeding;
> fashion for those with no taste.
>
> ------------------------------------------------------------------------
> [Image]
...Nice...
This page gives a generalized "egg" formula:
http://www.2dcurves.com/quartic/quartice.html
form.
A little toying with mathematica gives the
attached picture of an egg, with a=1/4 and b=7/5.
(I also wrote a Mathematica fonction that takes in
mathematica Graphics and converts it to mesh)
Best,
S.
----------------------------------------------------------
Steven Pigeon Ph. D. candidate
University of Montreal.
pig### [at] iro umontrealca Topic: data compression
----------------------------------------------------------
http://www.iro.umontreal.ca/~pigeon
Post a reply to this message
Attachments:
Download 'egg.wmf.dat' (328 KB)
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From: Sir Charles W Shults III
Subject: Re: How do you want your eggs today ? [78Kbu]
Date: 9 Mar 2002 16:25:52
Message: <3c8a7de0@news.povray.org>
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That's a nice algorithm, but you can do it very simply with this program
(attached).
Cheers!
Chip Shults
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip
Post a reply to this message
Attachments:
Download 'Eggy.pov.txt' (2 KB)
Download 'Eggy.jpg' (12 KB)
Preview of image 'Eggy.jpg'
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L'Harmonieux Forgeron wrote:
>
> Just trying a new object: ovus.
> It's just a pair of spheres with the right glue...
>
> Thanks to geometry description found at
> http://chronomath.irem.univ-mrs.fr/Courbes/ovale.html
From what I could see at the web page
you provided a link to above, it seems
that these eggs are glued together with
the same type of CSG-glue as I used to
assemle/connect the spheres and tori in
these two images:
http://news.povray.org/povray.binaries.images/13595/
http://news.povray.org/povray.binaries.images/12039/
Tor Olav
P.S.: I want my eggs done like this:
http://news.povray.org/povray.binaries.images/13849/
http://news.povray.org/povray.general/3255/23995
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"Sir Charles W. Shults III" wrote:
>
> Are you writing a macro for this?
No, I foolishly write a patch... copying some code of the sphere and torus.
--
Non Sine Numine
http://grimbert.cjb.net/
Post a reply to this message
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"Sir Charles W. Shults III" wrote:
>
> Are you writing a macro for this? I have used two spheres, one round
> and one elongated, chopped in half and fused together to make perfect eggs
> before. Sounds like a useful and simple tool.
Me too. In fact I use this:
#macro ovoid (Center, EquatorRadius, MinRadius, MaxRadius, Directrix)
union{
difference{
sphere{ 0,1 scale (MinRadius/EquatorRadius) }
plane{ -y, 0 }
}
difference{
sphere{ 0,1 scale (MaxRadius/EquatorRadius) }
plane{ y, 0 }
}
rotate_to(Directrix-Center)
scale EquatorRadius
translate Center
}
#end
Where rotate_to() is something like Reorient_Trans(); it rotates from +y
to the specified vector.
--
signature{
"Grey Knight" contact{ email "gre### [at] yahoocom" }
site_of_week{ url "http://digilander.iol.it/jrgpov" }
}
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<jer### [at] atosorigincom> wrote:
> > Are you writing a macro for this?
> No, I foolishly write a patch...
Do you plan uv-mapping support?
ABX
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On Sat, 09 Mar 2002 19:18:36 +0100, L'Harmonieux Forgeron <jgr### [at] freefr>
wrote:
> Just trying a new object: ovus.
> It's just a pair of spheres with the right glue...
interesting
here is my old poor attempt on egg in povray
ABX
Post a reply to this message
Attachments:
Download 'jajco.jpg' (29 KB)
Preview of image 'jajco.jpg'
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> Do you plan uv-mapping support?
No.
I do not like UV-mapping and I do not want to perform more math
to get a metric along the 2D curve. (a first though makes me believe
I would have to resolve an integral of 3 parts, with the middle part depending
on the parameters... a projection mapping might be worth consideration nevertheless,
so you could have UV mapping if you really want afterall...)
Moreover, my version of pov does not have UV installed anyway!
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