POV-Ray : Newsgroups : povray.binaries.images : Granites Intermezzo : Re: Granites Intermezzo Server Time
22 Jun 2021 09:06:36 EDT (-0400)
  Re: Granites Intermezzo  
From: Thomas de Groot
Date: 26 Apr 2021 08:22:30
Message: <6086b086$1@news.povray.org>
Op 26-4-2021 om 13:11 schreef Mr:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> Op 26/04/2021 om 08:55 schreef Thomas de Groot:
>>> Quick-and-Dirty.
>>>
>>> Yes, this is promising indeed! Good thinking!
>>>
>>
>> ...and with an appropriate pigment_pattern.
>>
>> Later today I shall study those two sites and see if I can use the info.
>>
>> --
>> Thomas
> 
> Exciting ! Now the tint looks spot on and better than the original.
> About pattern, however, the fact that both Ive's and your own "quick and dirty"
> versions feel more pleasing seems to confirm that the flakes scale may be
> slightly too small, even for realistic measurements. Though I do understand that
> Ive's scale is not acceptable to the rock specialist's expertise. Maybe a
> compromise could be found if the noise depth is not yet too low and could be
> reduced one level so as not to generate too small of a minimal cell?
> 
Finding the correct size/distribution of individual minerals is going to 
be a careful and slow process. Each pattern has its own range of scales; 
if I concentrate on /cells/ as in the latest image, the smallest should 
be a bit larger and the largest a bit smaller. ;-)

However, even in a RW granite, the very smallest minerals can only be 
distinguished through a microscope, forming  the basic matrix of the 
rock. Largest minerals can be really large, forming so-called 
/phenocrysts/. For those interested: 
https://en.wikipedia.org/wiki/Phenocryst .

-- 
Thomas


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