The Ridged Multifractal is found in a bunch of proggies, mostly HF
editors (Leveller, Wilbur, probably others).

However, it sees to have other uses. While on a whale watching trip
(didn't see any), I noticed that superimposed upon the larger scale
waves were tiny waves, which could be easily approximated by a ridged
multifractal normal. On the way to work, I saw cracks in the paint of a
wall, which again looked like a ridged multifractal, in pigment and in
normal. No other built in features of POV could accomplish this effect.

Any chance of seeing a patch with this as a pigment type (or any of the
other multifractal thingies)? Would be very handy....

Simon
http://home.istar.ca/~sdevet

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On Fri, 28 May 1999 23:29:56 -0300, Simon de Vet <sde### [at] istarca>
wrote:

>The Ridged Multifractal is found in a bunch of proggies, mostly HF
>editors (Leveller, Wilbur, probably others).
<snip>
>Any chance of seeing a patch with this as a pigment type (or any of the
>other multifractal thingies)? Would be very handy....
>
>Simon
>http://home.istar.ca/~sdevet

Where can I find info on these multifractal thingies?

Peter Popov
ICQ: 15002700

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On Thu, 10 Jun 1999 17:34:53 GMT, Peter Popov wrote:
>On Fri, 28 May 1999 23:29:56 -0300, Simon de Vet <sde### [at] istarca>
>wrote:
>
>>The Ridged Multifractal is found in a bunch of proggies, mostly HF
>>editors (Leveller, Wilbur, probably others).
><snip>
>>Any chance of seeing a patch with this as a pigment type (or any of the
>>other multifractal thingies)? Would be very handy....
>>
>>Simon
>>http://home.istar.ca/~sdevet
>
>Where can I find info on these multifractal thingies?

I forgot about this.  The new superpatch (don't download it yet -
it has bugs) contains a library called i_fract, contributed by 
Hans-Detlev Fink, that implements ridged multifractals for use with
isosurfaces.  The function name is "RidgedMultifractal" and the
parameters are as follows:

 * P0 : H
 * P1 : lacunarity
 * P2 : octaves
 * P3 : offset
 * P4 : gain

Ridged Multifractals were apparently created by F. Kenton Musgrave,
but his web page at GWU has gone offline permanently and I can't
find a replacement for it.

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Ron Parker wrote:

> On Thu, 10 Jun 1999 17:34:53 GMT, Peter Popov wrote:
> >On Fri, 28 May 1999 23:29:56 -0300, Simon de Vet <sde### [at] istarca>
> >wrote:
> >
> >>The Ridged Multifractal is found in a bunch of proggies, mostly HF
> >>editors (Leveller, Wilbur, probably others).
> ><snip>
> >>Any chance of seeing a patch with this as a pigment type (or any of the
> >>other multifractal thingies)? Would be very handy....
> >>
> >>Simon
> >>http://home.istar.ca/~sdevet
> >
> >Where can I find info on these multifractal thingies?
>
> I forgot about this.  The new superpatch (don't download it yet -
> it has bugs) contains a library called i_fract, contributed by
> Hans-Detlev Fink, that implements ridged multifractals for use with
> isosurfaces.  The function name is "RidgedMultifractal" and the
> parameters are as follows:
>
>  * P0 : H
>  * P1 : lacunarity
>  * P2 : octaves
>  * P3 : offset
>  * P4 : gain
>
> Ridged Multifractals were apparently created by F. Kenton Musgrave,
> but his web page at GWU has gone offline permanently and I can't
> find a replacement for it.

The source code of the Books "Texturing and modelling -- a procedural
approach" (first and second edition) by F. Kenton Musgrave et al. Could be
found at ftp adress:

archive.cs.umbc.edu

directory:

pub/textures

I know this, because I am writing my own HF proggie, and seached for those
fractal HF types.
Also included are the fractal types 'multifractal', 'heteroterrain' and
'hybridmultifractal' and 'fBM'.

I hope this will help

Yours
Axel Baune

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Ron Parker wrote:

> Ridged Multifractals were apparently created by F. Kenton Musgrave,
> but his web page at GWU has gone offline permanently and I can't
> find a replacement for it.

mus### [at] siggraphorg.

-- 
Ken Tyler

mailto://tylereng@pacbell.net

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On Fri, 11 Jun 1999 03:34:19 -0700, Ken wrote:
>Ron Parker wrote:
>
>> Ridged Multifractals were apparently created by F. Kenton Musgrave,
>> but his web page at GWU has gone offline permanently and I can't
>> find a replacement for it.
>
>mus### [at] siggraphorg.

Well, yeah... I was just thinking he didn't want all that email so I 
left his address out. :)  The address he gives in _Textures and Modeling: 
A Procedural Approach_ (www.metacreations.com/people/musgrave) also seems 
to redirect to his GWU page, but I would think it stands the best chance 
of being updated or pointed elsewhere sometime in the future.

BTW, got that book from the library last night and started reading it.  
Not what you'd call bedtime reading, but very very interesting nonetheless.
If you can find it and you want to know far more than you ever should need
to about procedural textures, get it.

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Ron Parker wrote:

> I forgot about this.  The new superpatch (don't download it yet -
> it has bugs) contains a library called i_fract, contributed by
> Hans-Detlev Fink, ......

Hi Ron,

I got everything compiled OK in your superpatch and I thank you for your
work. But I have no clue how to tackle the i_* bits. I never built a dll and
I do not know what the makefile should look like. I'm using mingw32/egcs if
that's any help to you for guidance you may supply.

In the hope someone can help,
Cheers,
Al.

P.S. I can give away my makefiles as they are at present (compiles the
superpatch, funny thing not resolved about the GUI stuff), but beware : I'm
no expert and they are ugly looking, yet they do the job and might help out
some lost soul.

--
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To answer me, please take out the Z from my address.

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On Sun, 13 Jun 1999 01:18:27 +0100, Alain CULOS
<ZAl### [at] bigfootcom> wrote:

>I got everything compiled OK in your superpatch and I thank you for your
>work. But I have no clue how to tackle the i_* bits. I never built a dll and
>I do not know what the makefile should look like. I'm using mingw32/egcs if
>that's any help to you for guidance you may supply.

Since you're using Windows, the easiest thing to do is probably to
download the binary version and just use the i_*.dll files that are
included with it.  I think they'll work regardless of the compiler
you're using, unless yours uses a different structure-packing method
than mine does by default.  If that fails, I seem to recall that the
Cygnus webpage has a few bits about building DLLs using cygwin, which
I understand is quite similar to mingw32.  I understand that it's not
for the faint of heart.  Try
http://sourceware.cygnus.com/cygwin/cygwin-ug-net/dll.html

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On Sun, 13 Jun 1999 01:18:27 +0100, Alain CULOS
<ZAl### [at] bigfootcom> wrote:

>Ron Parker wrote:
>
>> I forgot about this.  The new superpatch (don't download it yet -
>> it has bugs) contains a library called i_fract, contributed by
>> Hans-Detlev Fink, ......
>
>Hi Ron,
>
>I got everything compiled OK in your superpatch and I thank you for your
>work. But I have no clue how to tackle the i_* bits. I never built a dll and
>I do not know what the makefile should look like. I'm using mingw32/egcs if
>that's any help to you for guidance you may supply.
>
>In the hope someone can help,
>Cheers,
>Al.
>
>P.S. I can give away my makefiles as they are at present (compiles the
>superpatch, funny thing not resolved about the GUI stuff), but beware : I'm
>no expert and they are ugly looking, yet they do the job and might help out
>some lost soul.

I use mingw32 too.  I haven't had the time/nerve to tackle the
Superpatch yet.  I do, however have a link that may help you with the
.dll compilation.  Colin Peters' webpage has a gcc tutorial that
explains .dlls and how to compile them with mingw32.  Mouse down the
page until you find the windows programming tutorial.  It is at:
http://www.geocities.com/Tokyo/Towers/6162/gcc.html.

Jerry Anning
clem "at" dhol "dot" com

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Alain CULOS wrote:

> I got everything compiled OK in your superpatch and I thank you for your
> work. But I have no clue how to tackle the i_* bits. I never built a dll and
> I do not know what the makefile should look like. I'm using mingw32/egcs if
> that's any help to you for guidance you may supply.
>
> In the hope someone can help,

<snip>

Thanks to both replies, I'll do my best at recompiling (some weeks down the road
given my current speed there).
I think C dlls with cygwin are OK, whereas C++ might cause problems due to name
mangling being different. But in any case it would be a good exercise should I
wish to generate my own functions for the iso surface patch.
I'll let you know how I get on (be patient though).

Cheers,
Al.

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To answer me, please take out the Z from my address.

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