POV-Ray : Newsgroups : povray.binaries.images : Rusty chain : Re: Rusty chain Server Time
8 Aug 2024 16:22:08 EDT (-0400)
  Re: Rusty chain  
From: Jim Charter
Date: 24 Jul 2005 13:13:55
Message: <42e3cc53$1@news.povray.org>
Warp wrote:
> Slime <fak### [at] emailaddress> wrote:
> 
>>I think you need to work on the texture. The rust looks smooth and shiny.
>>You could make it rougher by adding a variation in the normal on a small
>>scale (maybe with the wrinkles or granite pattern but not scaled too big).
> 
> 
>   My reference image was this:
> 
> http://www.bio-vision.nl/ecards/gif/033306.jpg
> 
Okay, so I think that in general the brownish "rust" is occuring in the 
recesses and the bluish black areas are generally raised.  I suppose on 
the raised areas the rust either rubs off or they are more resistent to 
corrosion in the first place because of compositional irregularities and 
that is why they are raised.  Also in some places you can see wear marks 
that span a cavity without entering it.  I think that is the next level 
you have to take you picture to to get more realism.

When I first saw you picture I did think it suggested the sort of 
cumulative rot that would happen on a chain immersed in the water a lot, 
but not exclusively. So the depth of the texture didn't really throw me. 
It was more the pattern if brown.  As you photo shows it can be drizzled 
through the overall rot and almost look like it is a property of the 
material itself. But with enough observation, what the process is should 
eventually be revealed.  Slime shows advanced flaking from more exposure 
to air. I believe, he was trying to posit "rust" with extent of the 
corrosion you were evidently trying to show.

You see, you said "rust", which may have confused people, because we 
generally associate that word specifically with iron oxide which is 
usually caked or flaking or in a smooth thin cover but always quite matt 
in finish.


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