On 22-1-2019 12:26, ingo wrote:
> in news:web.5c46ee32e20dd126cd98345b0@news.povray.org Kenneth wrote:
> 
>> And/or the
>> historical significance of the .hf formula
> 
> In the days of old, the red+green chanel of 8 bit images where (ab)used to
> store 16 bit grayscale values for use in hight_field,
> 

Ah ha! of course! Now this makes me curious about subtle visual 
differences between height_field functions using .hf or .grey, because 
there should be some, shouldn't there? I shall investigate.

-- 
Thomas

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