I have no idea what this is, it just evolved, perhaps inspired by mops'
corals (
http://news.povray.org/povray.binaries.images/thread/%3C43f75349%40news.povray.org%3E/
). Maybe it also is a reflective sphere on a checkered surface. :-)

I used it to test a couple of texture (finish) macros:

// ordinary finish:

#macro _shinyness ( _g1 )
finish {
 ambient 0
 diffuse min (1, (1.65 - _g1))
 specular _g1
 roughness 1 / pow (500, _g1)
 reflection { 0.5 * max ( 0, _g1 - 0.65 ), 2 * max ( 0, _g1 - 0.65 ) }
}
#end

// metal finish:

#macro _metal ( _g1 )
finish {
 ambient 0
 diffuse 1 - _g1
 specular _g1 * 2
 roughness 1 / pow (250, _g1)
 metallic
 reflection { _g1 / 2, _g1 metallic }
}
#end

I think they work well, but I would be interested in comments. The parameter
value should be 0.0 to 1.0, higher values makes the object more shiny. I
have used several sources for the algorithms: mainly the good old
StrataVision 4.0 and 3d World magazine.

H

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Attachments:
Download 'metalthing.jpg' (78 KB)

Preview of image 'metalthing.jpg'

"helge_h" <nomail@nomail> wrote:
> I have no idea what this is, it just evolved, perhaps inspired by mops'
> corals (
>
http://news.povray.org/povray.binaries.images/thread/%3C43f75349%40news.povray.org%3E/
> ). Maybe it also is a reflective sphere on a checkered surface. :-)
>
> I used it to test a couple of texture (finish) macros:
>
> // ordinary finish:
>
> #macro _shinyness ( _g1 )
> finish {
>  ambient 0
>  diffuse min (1, (1.65 - _g1))
>  specular _g1
>  roughness 1 / pow (500, _g1)
>  reflection { 0.5 * max ( 0, _g1 - 0.65 ), 2 * max ( 0, _g1 - 0.65 ) }
> }
> #end
>
> // metal finish:
>
> #macro _metal ( _g1 )
> finish {
>  ambient 0
>  diffuse 1 - _g1
>  specular _g1 * 2
>  roughness 1 / pow (250, _g1)
>  metallic
>  reflection { _g1 / 2, _g1 metallic }
> }
> #end
>
> I think they work well, but I would be interested in comments. The parameter
> value should be 0.0 to 1.0, higher values makes the object more shiny. I
> have used several sources for the algorithms: mainly the good old
> StrataVision 4.0 and 3d World magazine.
>
> H

Great!.. Can you share metal texture?

Regards.
Hasan

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"Hasan3" <PRO### [at] Yahoocom> wrote:
> "helge_h" <nomail@nomail> wrote:
> > I have no idea what this is, it just evolved, perhaps inspired by mops'
> > corals (
> >
http://news.povray.org/povray.binaries.images/thread/%3C43f75349%40news.povray.org%3E/
> > ). Maybe it also is a reflective sphere on a checkered surface. :-)
> >
> > I used it to test a couple of texture (finish) macros:
> >
> > // ordinary finish:
> >
> > #macro _shinyness ( _g1 )
> > finish {
> >  ambient 0
> >  diffuse min (1, (1.65 - _g1))
> >  specular _g1
> >  roughness 1 / pow (500, _g1)
> >  reflection { 0.5 * max ( 0, _g1 - 0.65 ), 2 * max ( 0, _g1 - 0.65 ) }
> > }
> > #end
> >
> > // metal finish:
> >
> > #macro _metal ( _g1 )
> > finish {
> >  ambient 0
> >  diffuse 1 - _g1
> >  specular _g1 * 2
> >  roughness 1 / pow (250, _g1)
> >  metallic
> >  reflection { _g1 / 2, _g1 metallic }
> > }
> > #end
> >
> > I think they work well, but I would be interested in comments. The parameter
> > value should be 0.0 to 1.0, higher values makes the object more shiny. I
> > have used several sources for the algorithms: mainly the good old
> > StrataVision 4.0 and 3d World magazine.
> >
> > H
>
> Great!.. Can you share metal texture?
>
> Regards.
> Hasan

Here you go (for the main object):

#local Brass_color = color rgb <0.7, 0.612, 0.35>;

#local Bump0 = normal {
 granite
 scale 5
 bump_size -0.3
    slope_map {
      [ 0 <0, 1> ]
      [ 0.3 <1, 0> ]
      [ 1 <1, 0> ]
    }
}
#local Bump1 = normal { bumps scale 0.25 bump_size 0.3 }
#local Bump2 = normal { bumps scale 5 bump_size 0.3 }

#local CastMetal_normal = normal {
 average normal_map {
  [ 1 Bump0 ]
  [ 1 Bump1 ]
  [ 1 Bump2 ]
 }
}

#local CastMetal_texture = texture {
 pigment { Brass_color }
 normal { CastMetal_normal }
 _metal (0.4) // the macro from original post
}

H

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"helge_h" <nomail@nomail> wrote:

Very thanks.

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"helge_h" <nomail@nomail> wrote in message 
news:web.4403bbf171d7750e1c6902970@news.povray.org...
>I have no idea what this is, it just evolved, perhaps inspired by mops'
> corals


   It's a ball-bearing holder!  :)

     Nice render and textures!

      ~Steve~

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"St." <dot### [at] dotcom> wrote:
> "helge_h" <nomail@nomail> wrote in message
> news:web.4403bbf171d7750e1c6902970@news.povray.org...
> >I have no idea what this is, it just evolved, perhaps inspired by mops'
> > corals
>
>
>    It's a ball-bearing holder!  :)
>
>      Nice render and textures!
>


designed for a Heath Robinson device.
I think that it is a flange for a ball bearing floater. Part of an air
lubricated ball race. The nut should be chamfered or bevelled, I think.
Great image with good textures

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