I would like to request a polka dot pattern made up of plain
circles. The bozo pattern does not make perfect circles (or does
it?) so I would like a polka dot pattern. 

-- 
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lists free internet access providers.
http://www.crosswinds.net/~robertsc/free.htm

Win98 help file loaded with hints and tips, including securing a
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On Thu, 14 Sep 2000 15:07:22 -0400, Chuck Roberts wrote:
>I would like to request a polka dot pattern made up of plain
>circles. The bozo pattern does not make perfect circles (or does
>it?) so I would like a polka dot pattern. 

Try leopard.

-- 
Ron Parker   http://www2.fwi.com/~parkerr/traces.html
My opinions.  Mine.  Not anyone else's.

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On Thu, 14 Sep 2000 15:07:22 -0400, Chuck Roberts
<cro### [at] alleganisdorg> wrote:

>I would like to request a polka dot pattern made up of plain
>circles. The bozo pattern does not make perfect circles (or does
>it?) so I would like a polka dot pattern. 

Try spherical with a repeat warp and some turbulence (to the repeat
vector)


Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] usanet
TAG      e-mail : pet### [at] tagpovrayorg

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If you have MegaPOV you could also try a crackle pattern with form <1,0,0>

Rune
--
\ Include files, tutorials, 3D images, raytracing jokes,
/ The POV Desktop Theme, and The POV-Ray Logo Contest can
\ all be found at http://rsj.mobilixnet.dk (updated July 23)
/ Also visit http://www.povrayusers.org

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Could you code this out for me?
So turbulence can change aspects of repeat as much as the pattern
itself?

Peter Popov wrote:

> On Thu, 14 Sep 2000 15:07:22 -0400, Chuck Roberts
> <cro### [at] alleganisdorg> wrote:
>
> >I would like to request a polka dot pattern made up of plain
> >circles. The bozo pattern does not make perfect circles (or does
> >it?) so I would like a polka dot pattern.
>
> Try spherical with a repeat warp and some turbulence (to the repeat
> vector)
>
> Peter Popov ICQ : 15002700
> Personal e-mail : pet### [at] usanet
> TAG      e-mail : pet### [at] tagpovrayorg

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On Fri, 15 Sep 2000 10:16:55 -0400, "Greg M. Johnson"
<gre### [at] my-dejanewscom> wrote:

>Could you code this out for me?

I take that back. Repeat warps have no turbulence. Sorry.

On the other hand, for basic shapes (sphere, plane, box, cylinder) you
can use a pattern sharing the same shape (spherical, planar, boxed,
cylindrical) combined with an inverse black hole warp and some
turbulence. For example,

sphere
{
  0, 1
  pigment
  {
    spherical
    color_map
    {
      [0 White]
      [0.01 White]
      [0.01 Black]
      [1 Black]
    }
    warp 
    { 
      black_hole 0, 0.05 
      strength 1 inverse 
      repeat 0.2 turbulence 0.1
    }
  }
}

This is just a wild guess typed in directly in my newsreader so it
might not even parse the first time around, not to mention working as
I hope it will, but at least I hope it makes my idea clear.

>So turbulence can change aspects of repeat as much as the pattern
>itself?

Sorry, I was wrong there, the result of too much mental stress
combined with lack of sleep. I'll double-check next time I post.


Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] usanet
TAG      e-mail : pet### [at] tagpovrayorg

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I have tried spherical, spotted/bozo, and leopard. They all have
turbulence in them, which I don't want. I want a pattern of
perfect circles. I guess the texture is not the way to go.
Perhaps I'll have to make an image for an image map. But thanks.

Peter Popov wrote:
> 
> On Thu, 14 Sep 2000 15:07:22 -0400, Chuck Roberts
> <cro### [at] alleganisdorg> wrote:
> 
> >I would like to request a polka dot pattern made up of plain
> >circles. The bozo pattern does not make perfect circles (or does
> >it?) so I would like a polka dot pattern.
> 
> Try spherical with a repeat warp and some turbulence (to the repeat
> vector)
> 
> Peter Popov ICQ : 15002700
> Personal e-mail : pet### [at] usanet
> TAG      e-mail : pet### [at] tagpovrayorg

-- 
See my Free stuff page. It compares free website providers, and
lists free internet access providers.
http://www.crosswinds.net/~robertsc/free.htm

Win98 help file loaded with hints and tips, including securing a
Win 95/98 PC in a classroom setting. VB4 help file with lots of
code and hints. 
At http://www.crosswinds.net/~robertsc/

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On Wed, 20 Sep 2000 10:23:12 -0400, Chuck Roberts wrote:
>I have tried spherical, spotted/bozo, and leopard. They all have
>turbulence in them, which I don't want. I want a pattern of
>perfect circles. I guess the texture is not the way to go.
>Perhaps I'll have to make an image for an image map. But thanks.

Leopard does not have turbulence in it.  It does lead to somewhat
squarish dots on some surfaces if your color map has transitions
too close to the edge of the cells (anywhere past about .7, I think)
but it does not have built-in turbulence.  Neither does spherical.
Perhaps you should recheck your code.

Do note that these are 3d patterns, and as such might not look like
you expect them to on curved surfaces.  For a curved surface, you
need UV mapping, which (at the moment anyway) requires MegaPOV.

-- 
Ron Parker   http://www2.fwi.com/~parkerr/traces.html
My opinions.  Mine.  Not anyone else's.
Proudly not helping RIAA and SDMI steal my rights -- 
  http://www.eff.org/Misc/EFF/Newsletters/EFFector/HTML/effect13.08.html

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What's wrong with this?

camera { location -z*8 look_at 0 }
light_source { -z*100, 1 }

plane
{ -z,0
  pigment
  { spherical color_map
    { [0 rgb 1][.25 rgb 1][.25 rgb 0][1 rgb 0]
    }
    scale <1,1,100> translate <1,1,0>
    warp { repeat x*2 }
    warp { repeat y*2 }
  }
}


-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):_;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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Wasn't it Chuck Roberts who wrote:

>I have tried spherical, spotted/bozo, and leopard. They all have
>turbulence in them, which I don't want. I want a pattern of
>perfect circles. I guess the texture is not the way to go.
>Perhaps I'll have to make an image for an image map. But thanks.

You might consider trying to design your own (iso)pigment.

Something like this might be a starting point:-

box {-5,5
  pigment { function {sin(x)^2*sin(y)^2*sin(z)^2}
    color_map { [0.20 rgb <1,0,1>]
                [0.20 rgb <1,1,0>]
    }
  }
}

Rendering the isosurface that is associated with this isopigment miught
help you visualize what's going on:-

isosurface {function {sin(x)^2*sin(y)^2*sin(z)^2}
  threshold 0.2
  sign -1
  contained_by {box -5,5}
  pigment {rgb <1,1,0>}
}

The difference between this isopigment and the leopard pigment is that
the blobs are packed differently. The different packing patterns might
look better or worse, depending on the shape of the object you are
painting. You can visualize the 3d leopard pigment like this:-

#declare F=function{pigment{
  leopard 
  turbulence 0.0
  color_map { [0 rgb 1] [1 rgb 0] }
  scale 0.6
  }
}
isosurface {
   function { F(x,y,z) }
   threshold 0.5
   contained_by{box{-5,5}}
   pigment {rgb <1,1,0>}
}

-- 
Mike Williams
Gentleman of Leisure

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