On 21-1-2019 11:05, ingo wrote:
> in news:5c457919$1@news.povray.org Thomas de Groot wrote:
> 
>> note: I am not going to re-read that loooooooong thread...
>>
>>
> 
> It's in the docs, but not where you expect it.
> http://wiki.povray.org/content/Reference:File_Output_Options
> 
Indeed; I did not look there at all.

> Should appear in a few more places imo, like:
> http://wiki.povray.org/content/Reference:Color_Expressions#Dot_Item_Access
> _for_Colors
> 
Probably, in explaining how .grey/.gray is calculated. That seems to be 
missing.

> And it appears that .hf = (Red + Green/255)*0.996093 not the same as .gray
> as I thought.
> 
> http://wiki.povray.org/content/Documentation:Tutorial_Section_3.2
> #Noise_and_pigment_functions
> The only appearence of .hf I could find,
> 
Where also the value of .grey/.gray is given.

.hf is typically used in height_field functions like, e.g.:
height_field {function HF_res, HF_res {F_HF_01(x,y,z).hf}}

Contrary to what is said in the docs, .hf does not generate a warning 
(any more).

-- 
Thomas

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