Le 2021-12-31 à 10:41, Thomas de Groot a écrit :
> Op 31-12-2021 om 06:44 schreef Dave Blandston:
>> Thomas de Groot <tho### [at] degrootorg> wrote:
>>> I took my Granite_21 array for Dakota Red and extracted colour pairs. I
>>> also changed the reflection block because I guess the original
>>> reflection is way too strong. I used the reflection as given in
>>> Granite_21. A couple of further, inconsequential, changes et voilà.
>>
>> You would be shocked at what a mess I've made of the lighting and 
>> texturing in
>> the scene that this came from so yes the finish would need a lot of 
>> fixing. I've
>> always had trouble with that part of POV-Ray...
>>
> I agree. Sometimes finish can be straightforward, but especially with 
> reflections, there are tricky things to take care of.
> 
>>> I used 10 layers and scaled the final texture on the object. I could
>>> also have used much more layers (e.g. 100) and scale the texture
>>> somewhat less, with a similar result but a bit more confused imo.
>>
>> Ten layers is much more reasonable than a hundred and your excellent 
>> results
>> prove it. I admit that a hundred layers is a bit of overkill. 
>> (Sometimes I tend
>> to be a bit of a perfectionist. I don't quite have OCD, but I do have 
>> CDO which
>> is similar, but with the letters in alphabetical order like they're 
>> supposed to
>> be.)
>>
> In fact, I can imagine cases where a hundred layers would be be alright.
> 
>> I've been using this sample image as a Granite_21 reference point:
>>
https://news.povray.org/povray.binaries.images/attachment/%3C6089814e%40news.povray.org%3E/dakotagrains_sn_test.jpg

>>
>> This one represents near perfection in my opinion (the color samples I 
>> used came
>> from that picture, by the way). But I agree, both methods produce 
>> great results
>> and I'm more excited than ever regarding Granite_21. Thanks for 
>> sharing your
>> preliminary results!
>>
> The attached image shows, side by side, the granite as rendered with 
> your code (and 100 layers) at left, and as rendered with Granite_21, at 
> right. Both methods imo are valid, depending on what you want to 
> achieve. I focussed much more on the creation of individual grains 
> (which clearly has its drawback and limitations) while I think your 
> method is almost more intuitive/natural looking. In any case, I like it 
> quite a lot.
> 
> Best wishes for the New Year, take care! Extended to all Povers!
> 

The left one hints of a big piece while the one on the right fits better 
foe a small one.

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