"stephen parkinson" <ste### [at] zmemw16demoncouk> wrote in message
news:4027fb06@news.povray.org...
> istr eye structure similar to flies
> hexagon based
> can't remember the word! sad
>
> srp

You'll have a lot of luck if you use the normal:

normal
{
    hexagon (I don't have the reference -- it's something like that. Gotta
look that up.)
    scale <0.01, 0.01, 0.01> (or salt to taste)
}

That might make a really cool eye pattern (wish I had POV-Ray at work).

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Among other things, Dan P wrote:

>> istr eye structure similar to flies
>> hexagon based
>> can't remember the word! sad
> 
> You'll have a lot of luck if you use the normal:
> 
> normal
> {
>     hexagon (I don't have the reference -- it's something like that. Gotta
> look that up.)
>     scale <0.01, 0.01, 0.01> (or salt to taste)
> }
> 
> That might make a really cool eye pattern (wish I had POV-Ray at work).

Caution. The hexagon pattern is "made of" hexagonal prisms, it will give 
hexagons when the surface is perpendicular to these prisms, but something 
quite ugly when the surface is parallel. Can it be "wrapped around"?

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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> istr eye structure similar to flies
> hexagon based
> can't remember the word! sad

honeycomb structure?

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"fcueto" <fcu### [at] yahoocom> wrote in message
news:4028152d$1@news.povray.org...
>
> > istr eye structure similar to flies
> > hexagon based
> > can't remember the word! sad
>
> honeycomb structure?

Compound eyes.

Very cool dragonfly rendering!

Maybe the hexagon pattern would 'warp' (not wrap) spherically okay... Just
not sure though, not having done that myself-- until now:

global_settings{assumed_gamma 1}

// suburban clear sky colors
sky_sphere {
  pigment {
    gradient y
    color_map {
      [0.0 rgb <0.7,0.65,0.75>]
      [0.025 rgb <0.6,0.6,0.8>]
      [0.05 rgb <0.4,0.6,1.1>]
      [0.15 rgb <0.25,0.55,1.2>]
      [0.4 rgb <0.2,0.45,1.1>]
      [1.0 rgb <0.15,0.35,0.8>]
    }
  }
}

camera {
        location <1,2,-3>
        look_at 0
}

light_source {-100*z, 1 rotate <45,45,0>}

plane {y,-1
        pigment {checker color rgb 1, color rgb 0}
}

sphere {0,1
 pigment {hexagon color red 1, color green 1, color blue 1
  scale 0.005
  warp {spherical orientation <0,1,0> dist_exp 0}
  }
 normal {hexagon 0.25
  scale 0.005
  warp {spherical orientation <0,1,0> dist_exp 0}
 }
 finish {ambient 0 diffuse 0.8 specular 0.3
  reflection {<0.1,0.2,0.5>,<0.9,0.5,0.1> falloff 0.5 metallic}}
 scale <1.125,1,0.75>
}

So I guess it could look right done this way, except that I believe the
pattern might be nearly imperceptible even this close in reality. Ahh, and
now I find here http://www.ups.edu/biology/museum/dragoneye.html an example
of such an eye. This would require a crackle-like bordering for the
hexagons.

Bob H.

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> istr eye structure similar to flies
> hexagon based
> can't remember the word! sad
>

in portuguese we say "multifacetado"

Will

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"Jellby" <jel### [at] M-yahoocom> wrote in message
news:402809e5@news.povray.org...

> Caution. The hexagon pattern is "made of" hexagonal prisms, it will give
> hexagons when the surface is perpendicular to these prisms, but something
> quite ugly when the surface is parallel. Can it be "wrapped around"?

Try using UVMapping?

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stephen parkinson wrote:

> istr eye structure similar to flies
> hexagon based
> can't remember the word! sad
> 
"compound eye" (biol.)
(German: "Facettenauge")

Wolfgang

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I answer the criticism about my dragonfly's eyes
I started with photographical documents.
The scale of theeyes is to big to see the hexagon cells. Only the reflexion
of ligth forms an hexagon as you can see on the photo. I could'nt represent
that, its too difficult for me!!!!

news:4027ec05@news.povray.org...
> Among other things, Remy Closset wrote:
>
> > The first dtawing I send here
> > Entirely done with moray
>
> I love dragonflies.
>
> However, this one looks too reflective, especially the eyes, do they have
> any "structure" (eye-cells, whatever they're called)? And, although
> dragonflies have short legs (they can't walk), this one's look too short.
>
> -- 
> light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
> 9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
> 0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby
>

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Attachments:
Download 'aeshnetete.jpg' (13 KB)

Preview of image 'aeshnetete.jpg'

Among other things, Remy Closset wrote:

> I answer the criticism about my dragonfly's eyes
> I started with photographical documents.
> The scale of theeyes is to big to see the hexagon cells. Only the
> reflexion of ligth forms an hexagon as you can see on the photo. I
> could'nt represent that, its too difficult for me!!!!

You're right, the hexagonal structure is not apparent (maybe a 
definition/quality issue), but there is clearly something not quite right 
in your eyes (I mean, the dragonfly's eyes). You should try some kind of 
strongly blurred reflection at least (there have been some threads about it 
in these groups).

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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I answer the criticism about my dragonfly's eyes
 I started with photographical documents.
The scale of theeyes is to big to see the hexagon cells. Only the reflexion
of ligth forms an hexagon as you can see on the photo. I could'nt represent
that, its too difficult for me!!!!

> news:4027ec05@news.povray.org...
> > Among other things, Remy Closset wrote:
> >
> > > The first dtawing I send here
> > > Entirely done with moray
> >
> > I love dragonflies.
> >
> > However, this one looks too reflective, especially the eyes, do they
have
> > any "structure" (eye-cells, whatever they're called)? And, although
> > dragonflies have short legs (they can't walk), this one's look too
short.
> >
> > -- 
> > light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
> > 9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
> > 0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby
> >
>
>
>

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