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I like the vein effect in the mountains... most realistic... the misty mountain
lake is beautiful where is the waterfall...??
Mick Hazelgrove wrote:
> An experiment with ridged multifractels,isosurfaces and the trace function.
>
> The landscape is a ridged multifunction, the trees are isosurface cones with
> noise added and the rocks are spheres with noise added.
>
> The whole lot placed with the trace function.
>
> Mick
>
> *************************************************************
> http://www.minda.swinternet.co.uk/index.htm
>
> *************************************************************
>
> [Image]
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Hi all
This was just an experiment - not meant as a finished piece. The ridged
multifractal is slow to render - this is 2 ridged multifractals added
together and takes, with everything else, about six hours to render. The
biggest problem was scaling trace to trace a surface bigger than one unit.
It would be possible to make the landscape much bigger. The waterfall is a
good idea and I agree the sky would need lots of work if I was ever to
finish this piece. It was posted to give people an idea of what they might
do with the ridged multifractal.
Mick
*************************************************************
http://www.minda.swinternet.co.uk/index.htm
*************************************************************
"Chris Huff" <chr### [at] yahoo com> wrote in message
news:chrishuff_99-C9F81A.11222506032000@news.povray.org...
> In article <38C3CE4F.58AD268A@peak.edu.ee>, Margus Ramst
> <mar### [at] peakeduee> wrote:
>
> > That's a lot of isosurfaces... Won't it be slow?
>
> Not necessarily...the speed of an isosurface can vary a lot. Some are
> faster than most of the other shapes available(isosurface
> superellipsoids are faster than ordinary superellipsoids, for example).
> Others are extremely slow. In my experience, avoiding functions with
> high slope helps a lot. These seem pretty simple, noise3d() displaced
> cones, spheres, etc. They should render pretty fast if only one
> noise3d() is used. I don't know about the ridged multifractal though...I
> have never used it.
>
> --
> Chris Huff
> e-mail: chr### [at] yahoocom
> Web page: http://chrishuff.dhs.org/
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Mick Hazelgrove skrev i meddelandet <38c40e5b@news.povray.org>...
>It was posted to give people an idea of what they might
>do with the ridged multifractal.
What's a ridged multifractal?
--ll
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Moon47 wrote:
> I like the vein effect in the mountains... most realistic... the misty mountain
> lake is beautiful where is the waterfall...??
I agree, but I think they're way to pointy. Those peaks would weather down pretty
fast.
--
___ ________________________________________________________________
| \ |_ <dav### [at] faricynet> <ICQ 55354965>
|_/avid |ontaine http://www.faricy.net/~davidf/
"The only difference between me and a madman is that I'm not mad." -Dali
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The pointiness is kind of neat but not very realistic. Those peaks will wear
down with time!
I don't like the trees, but as just a sample pic I imagine you can do a lot more
with them.
Ground fog is excellent!
--
___ ________________________________________________________________
| \ |_ <dav### [at] faricynet> <ICQ 55354965>
|_/avid |ontaine http://www.faricy.net/~davidf/
"The only difference between me and a madman is that I'm not mad." -Dali
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In article <38C4312D.6B150756@faricy.net>, David Fontaine
<dav### [at] faricynet> wrote:
> The pointiness is kind of neat but not very realistic. Those peaks
> will wear down with time!
Maybe it is a newly terraformed planet, and the water cycle hasn't
existed long enough to weather the rocks very much. :-)
--
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/
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On Mon, 6 Mar 2000 05:28:26 -0000, Mick Hazelgrove wrote:
>An experiment with ridged multifractels,isosurfaces and the trace function.
>
>The landscape is a ridged multifunction, the trees are isosurface cones with
>noise added and the rocks are spheres with noise added.
>
>The whole lot placed with the trace function.
That is nice.
--
Cheers
Steve email mailto:sjl### [at] ndirectcouk
%HAV-A-NICEDAY Error not enough coffee 0 pps.
web http://www.ndirect.co.uk/~sjlen/
or http://start.at/zero-pps
10:40pm up 3 days, 22:53, 6 users, load average: 1.23, 1.20, 1.08
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Intriguing. Never used those multifractals. Any chance to have a peek at the
source?
sig.
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Mick Hazelgrove wrote:
>
The
> biggest problem was scaling trace to trace a surface bigger than one unit.
I'm not sure I understand this?
Margus
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In article <38c40e5b@news.povray.org>, "Mick Hazelgrove"
<mha### [at] mindaswinternetcouk> wrote:
> The biggest problem was scaling trace to trace a surface bigger than
> one unit.
I'm not sure I understand this...trace() is not scale dependant. It
takes a starting point, an object, and a direction, and intersects the
ray defined by the start point and direction with the object. The size
of the surface or distance of the intersection don't matter.
> It would be possible to make the landscape much bigger.
Hmm, you could probably do a nearly infinite flying animation by moving
the containing box for the landscape along with the camera, and using
the noise3d() function instead of rand() to place the rocks and trees.
Or you could just make a really big landscape...
--
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/
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