in news:5c442a26$1@news.povray.org Thomas de Groot wrote:

> However, Bald Eagle's
> 
>      function {
>        NormalMap(x,y,z).red +
>        NormalMap(x,y,z).green +
>        NormalMap(x,y,z).blue
>      } 1.5
> 
> gives a much better result and thus may be preferred.
> 

.gray and .hf = 0.3 * red + 0.59 * green + 0.11 * blue, so yes there's 
quite a difference to be expected.

ingo

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