I think the problem is that you are using an obliquely illuminated coin
image as a proxy for a heightfield.

For this problem you might get experimental and scan a coin - immersed in a
puddle of  red or green food coloring.
The resulting image should have highlights where the optical path through
the food coloring is the shortest.
Crop / filter / scale / reformat as required using your favorite image
editor.

I'll leave the rest to your imagination.

DLM

"PM 2Ring" <nomail@nomail> wrote in message
news:web.42d3c08da576ead11917bb8b0@news.povray.org...
> Here's what Australian dollar coins look like, almost. :) I just started
> this one last weekend. The coin faces are height fields, the milled edges
> are
> just normals on a cylinder, using a simple slope map & normal map.
>
> I'm not happy with the finish. I may need to find better source images for
> my
> height fields to improve the surface, so it reflects like a coin should.
> Some dirt and scratch marks on them would help, too, I guess. Also, the
> heights are wrong, because highlights are not always on the high points.
> For example, see the very heavy looking jawline on the Queen. (Sorry,
about
> that Liz. :)
>
> The face image originals I used are here:
> http://www.australianstamp.com/Coin-web/aust/dollar/dolleli2.htm
> but I've smoothed them a bit (maybe a bit too much) using the NetPBM
> package.
>
> Suggestions and constructive criticism welcome!
>


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