On 20-1-2019 17:36, Bald Eagle wrote:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> On 20-1-2019 9:33, ingo wrote:
> 
> 
>>> .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
> 
> I remember that from the LOOOOOOONG thread back at:
> 
>
http://news.povray.org/povray.advanced-users/thread/%3Cweb.577e597b5ff2a8e65e7df57c0%40news.povray.org%3E/?mtop=409379
> 
> (See post by Mssr Grimbert at bottom of pg 1)
> 
> 

Ah, yes. Like with the oren-nayar feature, I had that little bell 
ringing feebly at the back of my mind, but was unable to localise it, 
deeming it an early start of senility... :-)

note: I am not going to re-read that loooooooong thread...

-- 
Thomas

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