Wow, excellent cactus. I dont know how you could improve on it, looks just
great.

Chris Huff wrote:

> Here is my first attempt at a cactus in MegaPOV(inspired by some
> discussions in the thread "A clock"), it uses trace() and an isosurface.
> The texturing still needs a lot of work...
>
> --
> Chris Huff
> e-mail: chr### [at] yahoocom
> Web page: http://chrishuff.dhs.org/
>
>  [Image]

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Outstanding!!  Most realistic looking real-life thing.  I think the thorns
or pricks or whatever you want to call them is what makes it realistic - the
randomness, as well as the soft shadows.  Well done!!

Mike

"Chris Huff" <chr### [at] yahoocom> wrote in message
news:chrishuff_99-9D37D5.05283324022000@news.povray.org...
> Here is my first attempt at a cactus in MegaPOV(inspired by some
> discussions in the thread "A clock"), it uses trace() and an isosurface.
> The texturing still needs a lot of work...
>
> --
> Chris Huff
> e-mail: chr### [at] yahoocom
> Web page: http://chrishuff.dhs.org/
>
>

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Chris Huff wrote:
>Here is my first attempt at a cactus in MegaPOV(inspired by some
>discussions in the thread "A clock"), it uses trace() and an isosurface.

That looks great. If I can't come up with a good cactus could you share the
code ? :)

>The texturing still needs a lot of work...
>

Maybe just a slight granite normal scaled bigger in y than in x and z ?
I'll go fech some books since I haven't taken a better look at the "texture"
of real cactii :)

Jide

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This is a great image: what a piercingly fine cactus! How are you ever going
to do better?

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Regards,
Sander


Chris Huff <chr### [at] yahoocom> schreef in berichtnieuws
chrishuff_99-9D37D5.05283324022000@news.povray.org...
> Here is my first attempt at a cactus in MegaPOV(inspired by some
> discussions in the thread "A clock"), it uses trace() and an isosurface.
> The texturing still needs a lot of work...
>
> --
> Chris Huff
> e-mail: chr### [at] yahoocom
> Web page: http://chrishuff.dhs.org/
>
>

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I'm impressed!

I had thought that trace wouldn't work with the isosurface, I was obviously
wrong!

Which is a good thing as I've been experimenting with ridged multifractels
as a means of creating landscapes - now I can place things on them!

Mick

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"Chris Huff" <chr### [at] yahoocom> wrote in message
news:chrishuff_99-9D37D5.05283324022000@news.povray.org...
> Here is my first attempt at a cactus in MegaPOV(inspired by some
> discussions in the thread "A clock"), it uses trace() and an isosurface.
> The texturing still needs a lot of work...
>
> --
> Chris Huff
> e-mail: chr### [at] yahoocom
> Web page: http://chrishuff.dhs.org/
>
>

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In article <38b53386@news.povray.org>, "Bill DeWitt" 
<the### [at] earthlinknet> wrote:

> Looks great how it is but you are right, just a little bit of 
> texturing would go a long way on this. I am just baffled at how this 
> is one IsoSurface! I suspect that there is some sort of a sin()/cos() 
> thing going on, but dang if I can figger it.
> 
> There is a -lot- more to IsoSurface than I will ever be able to learn.

function {
   sqrt(
      sqr(x)
      + sqr(y-sqrt(sqr(x/2)+sqr(z/2))*1.5)
      + sqr(z)
   ) - 1
   - (sin(TH(x, y, z)*18)*0.1)//This is what makes the ridges
}

I will post the complete source in povray.text.scene-files after I clean 
it up a little.

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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In article <38b54e72@news.povray.org>, "Mike Weber" 
<mik### [at] pyxiscom> wrote:

> Outstanding!!  Most realistic looking real-life thing.  I think the 
> thorns or pricks or whatever you want to call them is what makes it 
> realistic - the randomness, as well as the soft shadows.  Well done!!

Soft shadows? There is only one point light in the scene, no area 
lights. I did use MegaPOV radiosity, that is probably what causes the 
realistic lighting...it looks quite bad without radiosity.
Or did you mean the way the shadows from the spines break up the outline?

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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reminds me of a 3d image i saw years ago, a cactus like that, in a pot with
arms and feet, in front of some blinds..

very nice :)

Rick

"Chris Huff" <chr### [at] yahoocom> wrote in message
news:chrishuff_99-9D37D5.05283324022000@news.povray.org...
> Here is my first attempt at a cactus in MegaPOV(inspired by some
> discussions in the thread "A clock"), it uses trace() and an isosurface.
> The texturing still needs a lot of work...
>
> --
> Chris Huff
> e-mail: chr### [at] yahoocom
> Web page: http://chrishuff.dhs.org/
>
>

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<juh### [at] kolumbusfi> wrote:

> That looks great. If I can't come up with a good cactus could you share 
> the code ? :)

See povray.text.scene-files:
Chris Huff IsoCactus 2/24/2000 4:14 PM


> Maybe just a slight granite normal scaled bigger in y than in x and z 
> ? I'll go fech some books since I haven't taken a better look at the 
> "texture" of real cactii :)

Granite, or dents, or maybe agate...something to give some smaller scale 
features to the surface. And some color variation.
And a halfway decent sand texture. Maybe some rocks and other plants.

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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Great! I have one of this type but it has fewer pleats and a smaller "dent"
in the top.
Could be a tad darker in color I think.

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