Op 16-4-2021 om 09:36 schreef Kenneth:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>>
>> I have come to the conclusion that granites21.inc is /based on/
>> granites.inc by Daniel Mecklenberg and not an exact reproduction of his
>> code. If we want those, we need to render the original file separately,
>>    with the initial conditions like Ive and you have done.
>>
> Yes, I agree. And in my personal opinion, the gamma 1.0 'look' is most likely
> what was intended, more or less-- based on my trust of your own knowledge of
> granites, and also the original comments by Daniel M, who seemed to know about
> the subject himself. It would surprise me if he did run his textures with a
> 2.2-gamma and accepted the result-- because I would assume that "North American
> Pink granite" is a well-known and 'standard' type of rock, agreed on by
> geologists.  Not like 'political viewpoints', ha.
> 
> 
Lol! My thoughts entirely. I assume that Daniel Mecklenburg intended his 
textures to be used with an added scale closely related to the 
/dimensions/ of the supporting object where a 10cm wide cube in one 
scene would need a different scale than a 10m wide stone wall in another 
scene. Caveat: if used in the same scene, both objects would of course 
need the same scale! I would argue that, by itself, any POV-Ray texture 
is "dimensionless" and needs a known support in order to be scaled 
accordingly.

I assume that the name "North American Pink" is the commercial name. As 
a geologist, I would call it a 'granodiorite' probably. The same goes 
for the other granites textures which I have been able to trace in the 
Real World.

In any case, as 'simple' users, lets be and remain creative! Also in the 
rgb/srgb matter (ouch! I did it again!). We have a saying here: "buiten 
de lijntjes kleuren" which translates as "colouring outside the lines 
(or the boundaries)" and meaning "breaking the rules" in particular 
concerning the creative process, but also applied to scientific 
research. It promotes serendipity without any doubt imo.

-- 
Thomas

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