Cousin Ricky nous apporta ses lumieres en ce 2007/07/07 15:01:
> These are the values that i used for the metal colors.  They were gleaned
> from a fusion of Web data, household articles, hardware from The Home
> Depot, illustrations from metallia.com, and loose change.
> 
> #declare c_ALUMINUM = rgb <0.89, 0.91, 0.91>;
> #declare c_BRASS_COOL = rgb <0.80, 0.80, 0.35>;
> #declare c_BRASS = rgb <0.80, 0.65, 0.30>;
> #declare c_BRASS_WARM = rgb <0.80, 0.55, 0.25>;
> #declare c_BRONZE_NEW = rgb <0.80, 0.50, 0.25>;  //polished, no patina
> #declare c_BRONZE_WARM = rgb <0.45, 0.30, 0.15>;
> #declare c_BRONZE = rgb <0.45, 0.35, 0.15>;
> #declare c_BRONZE_COOL = rgb <0.45, 0.40, 0.15>;
> #declare c_CHROME = rgb <0.61, 0.61, 0.65>;      //duplex Ni + Cr
> #declare c_COPPER = rgb <0.80, 0.45, 0.35>;
> #declare c_GOLD = rgb <0.95, 0.775, 0.40>;
> #declare c_PENNY = rgb <0.80, 0.45, 0.25>;       //"penny bronze" 5% Zn
> #declare c_SILVER = rgb <0.96, 0.96, 0.92>;
> #declare c_SILVER_COIN = rgb <0.66, 0.63, 0.57>; //75% Cu + 25% Ni
> #declare c_STAINLESS = rgb 0.49;
> #declare c_STAINLESS_WARM = rgb <0.51, 0.51, 0.47>;
> #declare c_STEEL = rgb <0.61, 0.59, 0.54>;
> #declare c_ZINC = rgb <0.78, 0.82, 0.80>;
> 
> Notes:
> 
>  - It appears that bronze can be *almost* *any* color--black, brown, olive,
>    gold, green, gray, etc.  My values were pure guesswork.  I can find lots
>    of "bronze" items in novelty stores and in The Home Depot, but who knows
>    how much of it was painted on?
> 
>  - c_CHROME is for electroplated chromium over nickel.  It is not the color
>    of solid chromium, which is a rare beast.
> 
>  - Freshly minted (American) pennies appear to be the same color as copper
>    pipe, but they quickly turn an orange color before the shine even wears
>    off.
> 
>  - c_ZINC makes a good galvanized texture when used with normal { facets }
>    and a low reflection { }.
> 
> 
> 
> ------------------------------------------------------------------------
> 
I've seen photos of pure, solid chrome. It's slightly yellowish, tending toward 
a shiny straw like colour. When plated on some other metal, it tends to loose 
that tint, unless the plating is *very* thick.
I have manipulated a lot of zinc, it's prety soft and usualy hard to polish. 
I've never seen zinc as shiny as your's. It asks for diffuse reflection.
Metals do have an ior, ranging from around 5 up to over 30 and possibly more. 
Just don't ask me HOW metalurgy scientists managed to calculate it... It depend 
on the exact aloy. Set it and use fresnel in the reflection block, it can 
improve the realism, together with variable reflection.
The metals textures in metals.inc have insanely high ambient values (from 0.1 to 
0.35!). Everybody should replace all the ambient values found by "ambient 0", or 
just remove the ambient entries. Personaly, I find that it give beter results.

-- 
Alain
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Seventh Day Adventism: No shit shall happen on Saturday.

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