On 20-1-2019 9:33, ingo wrote:
> 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
> 

Ah! I didn't know that!

-- 
Thomas

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