Rafal 'Raf256' Maj wrote:
> jrc### [at] msncom news:4204f2e5@news.povray.org
> 
> Very realistic :)

Thanks.

> 
> What was formula of distortion of surface? Somethinkg like 
> +f_crackle(x,y,z) ?
> 


Based on crackle yes but I defined the function on a pigment so I could 
use the pigment_map to manipulate the profile. Leaving out the 
turbulence manipulators*, the main idea was this:
Two instances of the crackle at scale .6 are averaged.  One is a map of 
tones designed to raise the edges of the cells to form "flakes", the 
second is a map of scaled down instances of crackle. Their scale changes 
across the cell of the larger crackle with the scale getting smaller 
towards the "raised" edge of the "flake".  Also the inner crackle cells 
are toned to form humps rather than hollows.

function {
  pigment {
   average
   pigment_map {
     [1
       crackle
       scale .6
       pigment_map {
         [0 rgb 0]
         [.1 rgb 0]
         [.3 rgb 1]
         [1 rgb .5]
       }
     ]
     [1
       crackle
       scale .6
       pigment_map {
         [0 rgb 0]
         [.1 rgb 0]
         [.3
	  crackle
           scale .15
           pigment_map {
            [0 rgb 0]
            [.1 rgb 0]
            [.3 rgb .5]
            [1 rgb 1]
           }
         ]
         [1
	  crackle
           scale .45
           pigment_map {
            [0 rgb 0]
            [.1 rgb 0]
            [.3 rgb .5]
            [1 rgb 1]
           }
         ]
       }
     ]
   }
  }
}

*generally like:
turbulence .35

octaves 4
lambda 2.1
omega .55

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