POV-Ray : Newsgroups : povray.binaries.images : Stone with Veins : Re: Stone with Veins Server Time
25 Jan 2022 18:53:53 EST (-0500)
  Re: Stone with Veins  
From: Thomas de Groot
Date: 31 Dec 2021 10:41:14
Message: <61cf249a@news.povray.org>
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!

-- 
Thomas


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