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Tom Melly wrote:
> I'm looking for 3d functions and images of the results of those functions -
> anyone know a good link?
>
> The sort of thing I'm after is z = x^2 + y^2
If you want to render those functions you might try the parametric surfaces
available in MegaPOV
-something like
parametric{
function u , v, u^2+ v^2
0 , 1
-1,1
}
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"Pabs" <pab### [at] hotmail com> wrote in message
news:391F661A.190894C5@hotmail.com...
>
> If you want to render those functions you might try the parametric
surfaces
> available in MegaPOV
> -something like
> parametric{
> function u , v, u^2+ v^2
> 0 , 1
> -1,1
> }
>
Sounds good and thanks for the help everyone - I was playing with using
formulas to generate the y value for a bicubic_patch -
for example
#macro ReturnY(nNum, rNum)
#local nTemp1 = (nNum/200)+1;
#local rTemp1 = (rNum/200)+0;
#local loopCount = 0;
#while (loopCount < 5)
#local nTemp2 = 2*(nTemp1 * rTemp1);
#local rTemp2 = (rTemp1 * rTemp1) - (nTemp1 * nTemp1);
#if (rTemp2 > 1)
#local rTemp2 = rTemp2 - 0.5;
#end
#local nTemp1 = nTemp2;
#local rTemp1 = rTemp2;
#local loopCount = loopCount + 1;
#end
#declare yResult = rTemp1 * 10; // this is the final result
#end
#macro MakePatch(xOffset, zOffset, wavePigment)
object {
bicubic_patch { type 1 flatness 0.01 u_steps 3 v_steps 3,
#local zPos = 0;
#while (zPos < 4)
#local xPos=0;
#while (xPos<4)
ReturnY(zPos+zOffset, xPos+xOffset)
// #debug concat("Y Value is:",str(yResult,5,25),"\n")
<xPos+xOffset, yResult, zPos+zOffset>
#local xPos = xPos + 1;
#end
#local zPos = zPos + 1;
#end
pigment{wavePigment}
finish{ambient 0.5}
}
}
#end
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In article <391F661A.190894C5@hotmail.com>, Pabs <pab### [at] hotmailcom>
wrote:
> If you want to render those functions you might try the parametric
> surfaces available in MegaPOV
Actually, for this particular one, I would use the isosurface.
isosurface {
function {x^2 + y^2 - z}
threshold 0
...
}
Though there are a lot of equations only suitable for parametric shapes.
--
Christopher James Huff - Personal e-mail: chr### [at] yahoocom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://chrishuff.dhs.org/
TAG Web page: http://tag.povray.org/
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Bill DeWitt wrote in message <391d46c0@news.povray.org>...
>
>"Tom Melly" <tom### [at] tomandluf9couk> wrote in message
>news:391c20e0@news.povray.org...
>> I'm looking for 3d functions and images of the results of those
>functions -
>> anyone know a good link?
>>
>> The sort of thing I'm after is z = x^2 + y^2
>>
>>
>
> I can't find the link or discussion now, but I remember that Gail was
>talking to me about how to convert some formulas from a page into
isosurface
>formats. Maybe you can find the discussion and the link is there...
>
Unfortunatly that discussion was in the middle of March in p.o-t (subject
French curves)
so it's long gone.
try http://www.astro.virginia.edu/~eww6n/math/math0.html (CRC Concise
Encyclopedia of Mathematics)
or http://www.kampsax.dtu.dk/~ra/polyhedra/polyhedra.html
Maybe Ken can help.
Gail
********************************************************************
* gsh### [at] monotixcoza * Reality.dat not found *
* http://www.rucus.ru.ac.za/~gail/ * Attempting to reboot universe *
********************************************************************
* The best way to accelerate Windows NT is at 9.8 m/s^2 *
********************************************************************
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Pabs wrote:
>
> Tom Melly wrote:
>
> > I'm looking for 3d functions and images of the results of those functions -
> > anyone know a good link?
> >
> > The sort of thing I'm after is z = x^2 + y^2
>
> If you want to render those functions you might try the parametric surfaces
> available in MegaPOV
> -something like
> parametric{
> function u , v, u^2+ v^2
> 0 , 1
> -1,1
> }
Why on earth would you want to use an Isosurface when the guy asked for
a paraboloid? The built in quadrics will suffice (and be a tad faster
to boot).
Xander
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On Mon, 15 May 2000 10:33:09 +0200, Gail Shaw wrote:
>
>Unfortunatly that discussion was in the middle of March in p.o-t (subject
>French curves)
>so it's long gone.
Not necessarily. I have a complete archive of that group, starting
sometime around March 7. If you'd like me to mail it or repost it,
just say the word.
Obviously, for copyright and other reasons, I won't mail it or repost it
for just anyone; Gail will have to approve.
--
Ron Parker http://www2.fwi.com/~parkerr/traces.html
These are my opinions. I do NOT speak for the POV-Team.
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On Mon, 15 May 2000 10:33:09 +0200, "Gail Shaw" <gsh### [at] monotixcoza>
wrote:
>Unfortunatly that discussion was in the middle of March in p.o-t (subject
>French curves)
>so it's long gone.
I have a complete archive of the messages on this server and I found
the posts in question. Ron has one, too, but I don't know if he
started doing his in time to have this thread (but I guess he'll reply
if he does anyway :) ). Drop me a line if you want it reposted.
Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] usanet
TAG e-mail : pet### [at] tagpovrayorg
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In article <392017A4.A16E98B6@mitre.org>, xan### [at] mitreorg wrote:
> Why on earth would you want to use an Isosurface when the guy asked for
> a paraboloid?
Ease of use(you can use the equation directly, instead of typing in a
bunch of coefficients), more flexibility if it ever needs to be more
than a plain paraboloid.
> The built in quadrics will suffice (and be a tad faster to boot).
They might be faster...but maybe not. This is a pretty simple equation,
and remember that isosurface superellipsoids often render faster than
the superellipsoid primitive. The quadric primitive might be similar.
--
Christopher James Huff - Personal e-mail: chr### [at] yahoocom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://chrishuff.dhs.org/
TAG Web page: http://tag.povray.org/
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Tom Melly wrote:
>
> I'm looking for 3d functions and images of the results of those functions -
> anyone know a good link?
>
> The sort of thing I'm after is z = x^2 + y^2
Some of these might help...
http://www.multimania.com/artphil/
http://members.aol.com/stbenge/iso_shapes/iso_shapelib.html
http://www.uib.no/People/nfytn/mathgal.htm
http://www.3dvue.net/doc/objets.htm
http://www.ipfw.edu/math/Coffman/steinersurface.html
--
Ken Tyler - 1400+ POV-Ray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/
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see also: http://www.swin.edu.au/astronomy/pbourke/
--
Ken Tyler - 1400+ POV-Ray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/
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