Op 21-4-2021 om 12:51 schreef Bald Eagle:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> I realise that I have taken
>> on a major investigation :-) and that is ok.
> 
> So did I while writing this!
> 
> 
>> Imo, the white represents the quartz veins that cut through the
>> granites. In the original code they came out as mere "clouds" of grey; I
>> brought them back at least as something looking like veins (the top
>> texture). See the examples I provided.
> 
> IIRC, the marble pattern is just a series of repeating lines that attains a
> marble look due to the turbulence.   Maybe make a material_map using turbulated
> marble and have the granite and quartz materials be the entries.
> 
Turbulence is the keyword assuredly. In the latest version (in examples 
shown above) the quartz veins are partly controlled by warp {turbulence 
...}. Which reminds me: warp {} is another one of those things 
"learned". The use of marble (or agate maybe?) may be useful; 
investigation required.

[Tonight, I am going to browse my old textbooks to get some more useful 
info about granites. Feels like old times; I didn't specialise in hard 
rock geology but rather in sedimentary environments. However, those 
stony things were part of the curriculum and, I think I mentioned it, 
the penultimate ice age conveniently brought Scandinavian granites to 
this region, and I have some of them in my backyard. I wouldn't be 
surprised if they were also related to the North American granites of 
the east coast of US and Canada through the action of plate tectonics. 
But that is a completely different story.]

-- 
Thomas

Post a reply to this message