Great, please let us know when it's up and running!

> 
> thats the idea behind povray.co.uk - a functions section is now in the 
list
> of things to do
> 
> 
> --
> Rick
>

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In the mean time, have a heart :)

function {
(x^2+y^2+z^2+2*y-1)*((x^2+y^2+z^2-2*y-1)^2-8*z^2)+16*x*z*(x^2+y^2+z^2-2*y-1)
}

;)

--
Lance.

http://come.to/the.zone

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In article <3A3C7E22.B67C37A0@gmx.de>, Christoph Hormann 
<chr### [at] gmxde> wrote:

> The 1/r function is probably quite near to reality, although i'm not
> totally sure and it's usually rounded at the bottom.  The 'atan2' part is
> maybe not that realistic, because such flows use to contain a lot of
> turbulence leading to a more irregular pattern.  

This function is actually 1/(r^2 + n), the "+ n" part gives it the 
rounded bottom you were talking about. I would be very surprised if it 
was actually close to describing reality, I just made it to *look* real.

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

<><

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In article <MPG.14a57ca52986461b98985d@news.povray.org>, 
jam### [at] dh70qdu-netcom (Jamie Davison) wrote:

> <foetal position>
> <Whimper>
> Make the bad man go away mommy...
> <shake>

Heh heh heh....

function {((cos(sqrt(x*x+z*z)) - y*y))}

function {((cos(sqrt(x*x+z*z))+cos(y) - y*y))}

function {sqrt(sqr(x) + sqr(y-sqrt(sqr(x/2)+sqr(z/2))*1.5) + sqr(z)) - 1 
- (sin(atan2(x, z)*Ridges)*0.5*RidgeDepth)}

function {sqrt(x*x + z*z) + cos(abs(y/4))*2 - 2 - noise3d(x*0.5, y*0.2, 
z*0.5)*0.75 - noise3d(x*0.25, y*0.05, z*0.45) - noise3d(x*4, y, 
z*4)*0.05}

function {sqrt(x^2 + y^2 + z^2) - 1 - abs(sin(TH(x, y, z) + 
(PI*12*atan(sqrt(x^2 + z^2)/y))))*abs(sin(atan(sqrt(x^2 + 
z^2)/y)*15))&(-y +0.01)}

function {A*x + B*y + C*z + ((-1*cos(sqrt(x*x + 
z*z)*1.5))/(sqrt(x*x+1+z*z)/5) + (noise3d(x*0.25, y*0.25, z*0.25) + 
noise3d(x*0.2, y*2, z*2)*0.075)*2)}

Had enough? I've got many more where those came from...some even longer. 
:-)

Seriously, these functions are made of pretty basic pieces...once you 
understand them, making things like this isn't difficult. And for a lot 
of things, you just need to know some basic equations and what the 
graphs of the other functions look like.

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

<><

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Chris Huff wrote:
> 
> Heh heh heh....
> 
> [...]
> 
> Had enough? I've got many more where those came from...some even longer.
> :-)
> 

I think there is a limit for complexity of a single function (not sure
what exactly it is but i touched it some times. Anyway you can always
split up the function into several parts.   

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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In article <3A3E45CA.6F04FD10@gmx.de>, Christoph Hormann 
<chr### [at] gmxde> wrote:

> I think there is a limit for complexity of a single function (not sure
> what exactly it is but i touched it some times.

Yes, the "parser is bored" error...


> Anyway you can always split up the function into several parts.  

I usually do that anyway, to make sure *I* don't get bored trying to 
read it...in addition, if the function repeats many times, putting the 
repetitive portion in a separate function could make an optimization 
possible in some future version...

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

<><

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On Sun, 17 Dec 2000 20:34:15 -0500, Chris Huff wrote...

[Much scary stuff snipped]

<fingers in ears>
La la la la la la la la...  I can't hear you...  la la la la la la...

And I'll stop this now, as it's starting to get more than a tad off 
topic, and I don't frequent p.o-t any more.

Bye for now,
     Jamie.

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