"Trevor G Quayle" <Tin### [at] hotmailcom> wrote:
> Warp <war### [at] tagpovrayorg> wrote:
> > aaglo wrote:
> > > - metal texture on the screws & screwdriver
> >
> >   I have to admit that I have no idea how to make a realistic-looking
> > metallic texture for the screwdriver...
>
> If you want a reflective clean metal, like crome or polished stainless
> steel, the material is basically defined by what it reflects.  Using
> environment mapping and real reflections rather than phong or specular
> highlighting (which tend to look more plasticky) can help considerably.
> You can also overlay a simple reflective chrome with layers of grease,
> dust, dirt, rust etc and still have the reflectivity partially revealed.
>
> -tgq

A shiny, denty, rusty, dusty chrome:

#declare TChrome=
texture{
  pigment{rgb 0.8}
  finish{ambient 0
    conserve_energy
    diffuse 0.0
    reflection{0 1 fresnel on metallic 0}
  }
  normal{dents 0.25 scale 1/15}
}


#declare TRust=
texture{
  pigment {
    granite
    color_map {
      [0.08 rgb <0.89, 0.51, 0.28>]
      [0.15 rgb <0.70, 0.13, 0.00>]
      [0.30 rgb <0.69, 0.41, 0.08>]
      [0.30 rgb <0.49, 0.31, 0.28>]
      [0.40 rgb <0.89, 0.51, 0.28>]
      [0.40 rgbt 1]
    }
  }
  finish {ambient 0 diffuse 0.4}
  normal{
    granite
    normal_map{
      [0.40 average normal_map{[1 granite -0.3][1 granite 0.2 scale 1/5]}]
      [0.40 granite 0]
    }
  }
}

#declare TDusty=
texture{
  pigment{

    #declare PW=1;
    slope y
    color_map{
      [pow(0.5,PW) rgbt 1]
      [1.0 rgbt <0.40784, 0.39216, 0.18431,0.1>]

    }
    poly_wave PW
  }
  finish{
    ambient 0
    diffuse 0.6
  }
  normal{
    slope y
    normal_map{
      [0.50 granite 0]
      [1.00 granite 0.2 scale 1/10]
    }
  }
}

#declare M1=
material{
  texture{TChrome}
  texture{TRust}
  texture{TDusty}
  interior{ior 15}
}


-tgq

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Trevor G Quayle <Tin### [at] hotmailcom> wrote:
> A shiny, denty, rusty, dusty chrome:

  Nice, but doesn't look too good on the screwdriver:

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Attachments:
Download 'sd.jpg' (22 KB) Download 's.jpg' (20 KB)

Preview of image 'sd.jpg'

Preview of image 's.jpg'

Warp <war### [at] tagpovrayorg> wrote:
> Trevor G Quayle <Tin### [at] hotmailcom> wrote:
> > A shiny, denty, rusty, dusty chrome:
>
>   Nice, but doesn't look too good on the screwdriver:

You're right, it didn't come out too well for you.  Try removing the dust
layer and scaling down the rust layer.  You can also try adjusting other
aspects of the rust layer too like pattern type (though I think granite
looks the best from what I've tried), normals and the colour_mapping.

Also, as I said before, for materials such as this, it's all about what is
there to be reflected.  An empty background will result in flat,
unconvincing reflections I find.  This is why I've started using a lot of
environment mapping.  I used to be a true purist and not want to use it,
but I have found that it's a lot easier than modelling a whole scene just
to show off one little object (also it stems from the development of the
lighting macro I posted recently)

Have a look at this image.  The top is rendered with just a black background
and a textured plane (with a single point light).  The bottom simply adds an
environment map (plus the associated scene lighting).

-tgq

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Attachments:
Download 'rustychrome.jpg' (644 KB)

Preview of image 'rustychrome.jpg'

Warp <war### [at] tagpovrayorg> wrote:
> Trevor G Quayle <Tin### [at] hotmailcom> wrote:
> > A shiny, denty, rusty, dusty chrome:
>
>   Nice, but doesn't look too good on the screwdriver:

FWIW, I don't think there's anything wrong with just shiney.  I think a
different texture for the tips might be nice.  The dull/grey portion at the
tips to me actually seems a little short on the ones in this photo, at least
compared with most of the screwdrivers I've seen that have this.
Charles

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On Wed, 16 May 2007 02:55:36 -0400, Warp wrote:

>   How about this one?

I really like the blue highlight on the upright screw.  Little touches
like this make (or break) a scene.  The wood texture is the only thing I
find wrong with this picture: it is somehow unconvincing.  Look at the
"knothole" by the screwdriver to see what I mean.

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"Charles C" <nomail@nomail> wrote in message 
news:web.464d33ea4ef76416a5fa4f50@news.povray.org...

     I think those might be magnetic tips?


        ~Steve~

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St. wrote:
>      I think those might be magnetic tips?

Not necessarily. They're just a stronger alloy than the screws tend to 
be made from.

-- 
   Darren New / San Diego, CA, USA (PST)
     His kernel fu is strong.
     He studied at the Shao Linux Temple.

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