Charles C wrote:
> This is a height_field (multiple actually, tiled, but not tile-able) 
> made from a nine* megapixel .png made of course from an orthogonal view 
> of crackle pattern pigment on a plane.  The pigment used for the 
> height_field is a *different* .png which is basically the original after 
> a few bucket-fills in GIMP with different colors to different 'stones.'
> 
> I could keep-it-in-POV-Ray (no image based height_fields or image_maps) 
> if I knew how to give individual stones different colors using crackle. 
>  Unfortunately it looks like there's a choice between patterns that can 
> give borders to cells, or patterns which can give different colors to 
> different cells.

It's simple:  Use the solid cell pattern as the coloring for the centers 
of the regions in the mortared cell pattern.

pigment { crackle
   pigment_map {
     [.1 rgb .75]
     [.1 crackle solid
       color_map { [0 rgb <.9,.8,.7>][1 rgb <.7,.6,.5>] }
     ]
   }
//  scale, rotate, and transform to taste
}

If you base the height_field off of a pigment instead of an image file, 
then you can use a suitable solid pattern to color the stones.  Then use 
another pigment_based height_field to generate the mortar.

Hope this helps,
John

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