What would be the best way to produce that nice dark metallic blue
that you find on old pocket watch hands?

  I've played around with irid, but just can't get it to work, (if
that's the right thing to use).

   Any pointers?

    Thanks.

    ~Steve~

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St. wrote:

>    What would be the best way to produce that nice dark metallic blue
> that you find on old pocket watch hands?


I think what you need is a more or less black texture with specular 
reflections that only reflect blue. Whether that can be done in POV, I 
don't know.

/Ib

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Ib Rasmussen <ib### [at] ibrasdk> wrote in news:3DD### [at] ibrasdk

>>    What would be the best way to produce that nice dark metallic blue
>> that you find on old pocket watch hands?
> I think what you need is a more or less black texture with specular 
> reflections that only reflect blue. Whether that can be done in POV, I 
> don't know.

It can by :) just think ;)


-- 
#macro g(U,V)(.4*abs(sin(9*sqrt(pow(x-U,2)+pow(y-V,2))))*pow(1-min(1,(sqrt(
pow(x-U,2)+pow(y-V,2))*.3)),2)+.9)#end#macro p(c)#if(c>1)#local l=mod(c,100
);g(2*div(l,10)-8,2*mod(l,10)-8)*p(div(c,100))#else 1#end#end light_source{
y 2}sphere{z*20 9pigment{function{p(26252423)*p(36455644)*p(66656463)}}}//M

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Hi

Glad someone else has the same problem :)
I was reasonably succesful with "blued steel" springs in pov 3.0 and
3.1 but 3.5 won't play. With radiosity they tend to have a red cast,
even using a pigment or reflection with red 0.

You should be able to see the difference here:

http://www.peake42.freeserve.co.uk/pix1/6stix2.jpg  (3.1 and 200k
sorry)
and stix3v5.jpg, 3.5 and 93k.

For 3.5 I used this which still needs working on
texture{
    pigment{ rgb <0.2,0.5,0.9>*0.8 } // Adjust for radiosity.
    finish {
        brilliance 2
        diffuse 0.2 // Radiosity doesn't like 0
        metallic
        specular 0.5
        roughness 0.05
        conserve_energy
        reflection{ 0.05, 0.3 metallic } // Try <0,0.15,0.3>
    }
}

Alf

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"Alf Peake" <alf### [at] peake42freeservecouk> wrote in 
news:3ddfc840@news.povray.org

[...]

Mine idea was to used layer texture - top gives only specular (and is 
blue), lower gives only diffuse (and it's dark-gray / black)

-- 
#macro g(U,V)(.4*abs(sin(9*sqrt(pow(x-U,2)+pow(y-V,2))))*pow(1-min(1,(sqrt(
pow(x-U,2)+pow(y-V,2))*.3)),2)+.9)#end#macro p(c)#if(c>1)#local l=mod(c,100
);g(2*div(l,10)-8,2*mod(l,10)-8)*p(div(c,100))#else 1#end#end light_source{
y 2}sphere{z*20 9pigment{function{p(26252423)*p(36455644)*p(66656463)}}}//M

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> Mine idea was to used layer texture -

I rarely get past the simple texture stage, and in this case I did not
think of it :/
Thanks for the push.

Alf

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"Ib Rasmussen" <ib### [at] ibrasdk> wrote in message
news:3DD### [at] ibrasdk...

> I think what you need is a more or less black texture with specular
> reflections that only reflect blue. Whether that can be done in POV,
I
> don't know.

      Thanks Ib. It seems to work in wPoV 3.5 ok. I'm getting the
right colour at least, but in my reply to Alf below, I think it's the
'sheen' that's missing. Specular seems to be the word I've neglected
with this little project though, and it's helping to play around with
it.
   It's just a basic scene with a gold pocket watch but I want to try
and get the hands right from memory - close so far, but no cigar! ;)

    Thanks again.

     ~Steve~


>
> /Ib
>

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"Alf Peake" <alf### [at] peake42freeservecouk> wrote in message
news:3ddfc840@news.povray.org...
> Hi
>
> Glad someone else has the same problem :)
> I was reasonably succesful with "blued steel" springs in pov 3.0 and
> 3.1 but 3.5 won't play. With radiosity they tend to have a red cast,
> even using a pigment or reflection with red 0.
>
> You should be able to see the difference here:
>
> http://www.peake42.freeserve.co.uk/pix1/6stix2.jpg  (3.1 and 200k
> sorry)

   Thanks Alf. Very nice, and quite close. A good effort indeed. I
think the word that PoV is missing is the word "Sheen" - and your
"blued steel" term for this particular problem is in fact the right
term. I think I've got the blued steel so far but not the 'sheen' as
yet.

> and stix3v5.jpg, 3.5 and 93k.

    Ah! That's where I've seen it before!  Yes, I can see the
difference, if only slightly.


>
> For 3.5 I used this which still needs working on
> texture{
>     pigment{ rgb <0.2,0.5,0.9>*0.8 } // Adjust for radiosity.
>     finish {
>         brilliance 2
>         diffuse 0.2 // Radiosity doesn't like 0
>         metallic
>         specular 0.5
>         roughness 0.05
>         conserve_energy
>         reflection{ 0.05, 0.3 metallic } // Try <0,0.15,0.3>
>     }
> }

      Very close to some of my settings apart from I haven't put
brilliance or conserve_energy in. (Why didn't I think of brilliance?
Doh!)

      I'll give some of that code a whirl if you don't mind Alf,
thanks again.

     ~Steve~

>
> Alf
>
>
>
>
>

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> "blued steel" term for this particular problem is in fact the right
> term. I think I've got the blued steel so far but not the 'sheen' as
> yet.

Well, I apprenticed as a watchmaker. The steel screws and stuff would
be very polished before heating on a bed of brass shavings. The finish
would depend on how well you did the work.

> > and stix3v5.jpg, 3.5 and 93k.

Spot the deliberate error. A typo buried "thing" in the table and I
didn't notice :( Don't tell anyone about the one in p.b.i. ;)

>       Very close to some of my settings apart from I haven't put
> brilliance or conserve_energy in. (Why didn't I think of brilliance?

In pov 3.1 I used brilliance around 10.

Alf

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