Just playing with isosurfaces this afternoon. My goal was to create the 
'fluted' erosion patterns seen in certain sandstone rock formations. I 
only partially succeeded.

Questions & comments are always welcome :)

-- 
Samuel Benge

stb### [at] hotmailcom

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Attachments:
Download 'isoland2.jpg' (28 KB)

Preview of image 'isoland2.jpg'

I like it!  What's the function?

Dave Matthews


Samuel Benge wrote:
>Just playing with isosurfaces this afternoon. My goal was to create the
>'fluted' erosion patterns seen in certain sandstone rock formations. I
>only partially succeeded.
>
>Questions & comments are always welcome :)
>
>--
>Samuel Benge
>
>stb### [at] hotmailcom
>

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It's a combination of f_noise3d and a bumps pattern with a looped 
color_map. The texture is sloped. It renders pretty fast considering 
there are only two light_sources, one of which casts no shadows. I 
posted the source in povray.text.scene-files

Dave Matthews wrote:

> I like it!  What's the function?

-- 
Samuel Benge

stb### [at] hotmailcom

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Nice, it needs some vertical breakup perhaps. Good to see you posting here
again I always enjoy your work.

Mick

"Samuel Benge" <sbe### [at] hotmailcom> wrote in message
news:3F7### [at] hotmailcom...
> Just playing with isosurfaces this afternoon. My goal was to create the
> 'fluted' erosion patterns seen in certain sandstone rock formations. I
> only partially succeeded.
>
> Questions & comments are always welcome :)
>
> -- 
> Samuel Benge
>
> stb### [at] hotmailcom
>


----------------------------------------------------------------------------
----

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Mick Hazelgrove wrote:

> Nice, it needs some vertical breakup perhaps.


I agree. I have an idea of how that can be done, but there is a big 
obstacle preventing me from creating an easy-to-implement erosion model. 
You see, if there was a crackle-type pattern that featured radiating 
lines coming from the center of each cell, such things as erosion might 
be much easier to model. I attached an example of what I mean.

>Good to see you posting here
> again I always enjoy your work.


Thanks, it's good to be here :c)

> 
> Mick


-- 
Samuel Benge

stb### [at] hotmailcom

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Attachments:
Download 'example.jpg' (20 KB)

Preview of image 'example.jpg'

I fear that this particular one would be time consuming to compute.

Talking about patterns, I'm also looking for one that could be used to 
do centered cracks, I tried to do a cylindrized version of crackle but 
it didn't do it.

JC

Samuel Benge wrote:
> Mick Hazelgrove wrote:
> 
>> Nice, it needs some vertical breakup perhaps.
> 
> 
> 
> I agree. I have an idea of how that can be done, but there is a big 
> obstacle preventing me from creating an easy-to-implement erosion model. 
> You see, if there was a crackle-type pattern that featured radiating 
> lines coming from the center of each cell, such things as erosion might 
> be much easier to model. I attached an example of what I mean.
> 
>> Good to see you posting here
>> again I always enjoy your work.
> 
> 
> 
> Thanks, it's good to be here :c)
> 
>>
>> Mick
> 
> 
> 
> 
> ------------------------------------------------------------------------
>

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engines.

What do you mean when you say you tried to do a centralized version of 
crackle, but it didn't do it? The cetralized crackle didn't form cracks, 
or you couldn't make a centralized crackle at all?

The reason why I ask is because I found the solution to making crackle 
with radiating lines yesterday. Actually, Alex Kruchikov found it first, 
but he took it futher to create his curles pattern (see Curly Patterns, 
povray.binary.scene-files 9/13/03). I haven't made really good erosion 
patterns with it yet; it's going to take some heavy-duty layered 
patterns to get what I want.

Here is the altered code if you are interested:

//The Code

#declare Spokes=
  function{
   pattern{radial frequency 4}
  }

#declare Cells=
  function{
   pattern{crackle form x*1 }
  }

#declare Starbursts=
  function{
    (
     sin(
      +Spokes(
       Cells(x,y,z)-Cells(x,y,z-.03),
       0,
       Cells(x,y,z)-Cells(x+.03,y,z)
      )*2*pi
     )
     +1)*(1/2)
   }

plane{y,0
  pigment{
   function{Starbursts(x,y,z)}
  }
}


JC (Exether) wrote:


> I fear that this particular one would be time consuming to compute.
> 
> Talking about patterns, I'm also looking for one that could be used to 
> do centered cracks, I tried to do a cylindrized version of crackle but 
> it didn't do it.
> 
> JC


-- 
Samuel Benge

stb### [at] hotmailcom

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