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Thomas de Groot <tho### [at] degroot org> wrote:
> I am trying to get a grip on how to
> tweak the translucency parameter. For instance, I experimented with the
> use of a complementary colour instead of a regular colour taken from the
> granite colour_map, with interesting results.
http://news.povray.org/povray.binaries.images/message/%3C4f5748d5%40news.povray.org%3E/#%3C4f5748d5%40news.povray.org%3
E
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Also, maybe someone can hunt down a copy of this paper:
I couldn't find a copy anywhere (so far)
Modeling and Rendering of Heterogeneous Granular Materials: Granite Application
March 2007Computer Graphics Forum 26(1):66 - 79
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Op 25/05/2021 om 02:21 schreef Bald Eagle:
> Modeling and Rendering of Heterogeneous Granular Materials: Granite Application
I got no farther than this:
https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1467-8659.2007.00949.x
Pricey guys those editors! It is slowly changing with journals gradually
becoming more "open access". However, the /big/ journal editors (like
Wiley) are stalling of course...
--
Thomas
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in news:60ac9817$1@news.povray.org Thomas de Groot wrote:
> https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1467-8659.2007.00949.x
You are aware of Sci-hub? https://sci-hub.41610.org/
Ingo
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Op 25/05/2021 om 08:57 schreef ingo:
> in news:60ac9817$1@news.povray.org Thomas de Groot wrote:
>
>> https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1467-8659.2007.00949.x
>
> You are aware of Sci-hub? https://sci-hub.41610.org/
>
> Ingo
>
I hadn't been! Thanks a lot indeed!
--
Thomas
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ingo <ing### [at] tagpovrayorg> wrote:
> You are aware of Sci-hub? https://sci-hub.41610.org/
>
> Ingo
Ugh - I was, casually. Forgot about that. Did the trick - thanks :)
I dug up a few other papers, will see if they have anything that helps in the
current situation.
Thanks, Ingo
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"Bald Eagle" <cre### [at] netscapenet> wrote:
> Maybe the best sslt test-bed would be a back-lit wedge of material, much like
> what Ansel Adams would do with the Zone System when calibrating negatives and
> prints.
This is a thin prism (0 to 0.1) with a single point light behind the left edge.
I'm wondering if eval_pigment could act as a way to guide the result?
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Attachments:
Download 'granitessltwedge.png' (91 KB)
Preview of image 'granitessltwedge.png'
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Op 24-5-2021 om 19:29 schreef Bald Eagle:
> Now that it's looking good, I'd say it's time to think....
Yeah! Still need to answer these comments. I have a bunch of RL writings
to do presently. However, I have some ideas and shall not forget. Just
in need of time...
--
Thomas
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Thomas de Groot <tho### [at] degrootorg> wrote:
> I have a bunch of RL writings to do presently.
I know. I'm busy for next 2-3 days as well, but it's all still kicking around
up there.
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Op 24-5-2021 om 19:29 schreef Bald Eagle:
> There should definitely be a parameter passed to the macro for width of the
> vein, and frequency of occurrence.
>
Have to look into this.
> Now that it's looking good, I'd say it's time to think about how to pass
> alternative color maps into the texture - both to model other granite types, as
> well as use the change to spot something in the current implementation that
> might be hiding, but a different color scheme might bring out.
>
My choice is this (See also the latest beta: Granite_21_beta_1.4.mcr
below) is:
- a master macro: Granite_21 ()
- include files containing the necessary arrays for the different
granites, and to be declared by the user and read by the macro.
- at this moment (also default) there is DakotaRedGranite.inc
> Piggybacking on that idea, there should be some triggerable material attribute
> data output to #debug with numbered map entries, and then we could have a
> mechanism to pass in a color for a single entry on-the-fly. Then it would be
> easy to plug the macro calls into a loop and render a ton of different samples
> when tweaking a new material.
>
Possibly the present bata can do this. Not tested.
> The macro should also top up my coffee or G&T while I'm working on a scene,
> depending on the value of a required parameter. :D
>
The coffee parameter is not yet available.
>
>> I am trying to get a grip on how to
>> tweak the translucency parameter.
>
> The way clipka explained it that the translucency color is geared toward what
> color you want the sslt effect to take on as it percolates through the material.
> So for skin, where the blood will add a red color and absorb the blue and
> green, you set the color to a red-channel dominant rgb vector.
>
Absolutely.
> Maybe the best sslt test-bed would be a back-lit wedge of material, much like
> what Ansel Adams would do with the Zone System when calibrating negatives and
> prints.
>
Yes. I used the bunny...
> Clipka also recommended in one thread to overlay the sslt texture layer with
> something else and maybe(?) he specifically said to only set the sslt in the
> lower layer... I'd have to search and pull it up.
>
That is definitely what one should do as far as my tests show.
--
Thomas
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