POV-Ray : Newsgroups : povray.binaries.images : workbench_train_02.png : Re: workbench_train_02.png Server Time
19 May 2024 22:34:40 EDT (-0400)
  Re: workbench_train_02.png  
From: Mike Miller
Date: 29 Nov 2023 12:15:00
Message: <web.656771366e5f46b9896a9a9adabc9342@news.povray.org>
Alain Martel <kua### [at] videotronca> wrote:
> > "Cousin Ricky" <rickysttATyahooDOTcom> wrote:
> >> "Mike Miller" <mil### [at] gmailcom> wrote:
> >>> Updated train on workbench. Added Santa hat on mannequin, ribbon/bow on train,
> >>> and a few Christmas cards. Getting close on this one. May tweak the view angle a
> >>> bit.
> >>> Miller.
> >>
> >> The textures of the metal trimmings on the locomotive look milky.  I suggest
> >> lowering the diffuse and ambient values in the finish.
> >
> > Thanks...I'll take a look at that.
> > Usually, a metallic finish should have an ambient of zero, or a very
> small value for a very dull surface.
> Then, a diffuse should be less than 0.3. 0.3 for the dullest finish,
> down to zero for the very shiny.
> Use reflection with the metallic attribute.
> The finishes in metals.inc and golds.inc are totally wrong. They have
> insane ambient values. They where made to look good in an empty scene
> with nothing but black to reflect.
> If the metal is to have a varnish coat, add a second mostly to fully
> transparent pigment layer above the metallic one. Add an interior
> statement for the IOR : interior{ ior 1.5 } And use the fresnel
> attribute : reflection{ 1 fresnel }.
> That way, at high angle, you'll see almost only the metallic surface,
> but, at grazing angles, you get the fresnel reflection dominating.
> Tried that and compared with actual metals, brass actually, coated with
> a varnish, and the result matched my physical samples.

Thanks for the info. The metal finishes I used have been tweaked from files long
ago. :) I'll review what I'm using and test out your suggestions. I'm sure I've
not tried adding a clear coat to basic metals.
Best regards,

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