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Op 14-12-2021 om 12:46 schreef Bald Eagle:
> Thomas de Groot <tho### [at] degroot org> wrote:
>> Op 13/12/2021 om 22:09 schreef Paolo Gibellini:
>>>
>>> Wow, fluffy trees! They can lend themselves to many experiments.
>>> Nice work!
>>> Paolo
>>
>> Thanks Paolo. I am not entirely done, I think. But yes, there is much
>> room for experiments indeed.
>>
>> --
>> Thomas
>
> This would obviously be great to make "smoke trees" of the genus Cotinus.
>
> I first discovered these on my commute up Route 287 in NJ when I was working at
> (now defunct - thanks, Monsanto) American Cyanamid in the early 90's.
>
Indeed. Beautiful plants. Shall put them in the ToDo List, Volume 15,
Page 532... ;-)
--
Thomas
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Thomas de Groot <tho### [at] degrootorg> wrote:
> Continuing to visit ancient code, this time something that attracted my
> attention years ago: the media trees used by Gilles Tran in his
> MakeCloud application
> http://www.oyonale.com/image.php?code=431&mode=info§ion=2003&lang=fr
>
> I took the relevant code out of the application and updated it to POV
> version 3.8 into a tree macro. The result is slightly different from the
> original but very useful (and fast) to be used as background trees in a
> landscape. Maybe I can improve further.
>
> I take the liberty to attach the code here, with the image.
>
> Hope you find it useful.
>
> --
> Thomas
Very exciting! the shading is spot on !
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Thomas de Groot <tho### [at] degrootorg> wrote:
>
> Thanks Paolo. I am not entirely done, I think. But yes, there is much
> room for experiments indeed.
>
That is clever and effective. I have always been interested in the possibilities
of using 'solid' (or semi-solid) media for creating interesting shapes.
Currently, I'm working on using POV-Ray's 'object' pattern and filling that with
media, along with applying an image_map for the media's colors. The code is
complex and uses functions, which is why I haven't posted about it yet; it needs
some detailed comments added, to explain how it works.
Anyway...
Examining your code, it looks like there are two different color schemes for the
trees, in #macro Tree(rd_)...
#local R1 = rd_;
#local R2 = RRand(0.0, 1.0, R1);
#if (R1 < 0.2) // yellowish-green
#local C_Media = <RRand(180, 200, R1), RRand(180, 200, R1), 90>/255;
#else // blue-ish
#local C_Media = <RRand(50, 100, R1), RRand(155, 200, R1), 87>/255;
#end
...... but when the macro is actually called later in the 'woods' #while loop to
create the many trees, it's like this (in two places):
Tree(0) // zero
If I understand the code correctly, that imposes the same 'initial'
yellowish-green color on *all* the trees-- because 0.0 is always less than
#if (R1 < 0.2)
in the macro. To get a good distribution of the TWO colors, I used
Tree(rand(rd))
for both of the macro calls in 'woods'. Or maybe some version of RRand(...)
would work better.
----------
[Somewhat off-topic):
I am also curious about RRand(...) itself, and how it is used here. If rd_ (i.e.
R1) in the 'Tree' macro *is* 0.0, than that is used as the random-number stream
for RRand(...). I didn't know that 0.0 could be successfully used for that-- or
even for seed(0). I have always used at least 1. But zero does work!
I guess I need to take a look at 'math.inc', to see how RRand() is actually
constructed. And to re-read the docs concerning seed() and rand() too ;-)
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BTW, I was genuinely surprised that a media/samples count of only 1 would
produce such a visually-appealing result! And a reasonably fast render, too.
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Op 15-12-2021 om 11:34 schreef Kenneth:
> BTW, I was genuinely surprised that a media/samples count of only 1 would
> produce such a visually-appealing result! And a reasonably fast render, too.
>
I didn't even think about that really ;-) I guess it is mainly the
absorption which does the trick...
--
Thomas
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Op 15-12-2021 om 11:00 schreef Kenneth:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>>
>> Thanks Paolo. I am not entirely done, I think. But yes, there is much
>> room for experiments indeed.
>>
>
> That is clever and effective. I have always been interested in the possibilities
> of using 'solid' (or semi-solid) media for creating interesting shapes.
> Currently, I'm working on using POV-Ray's 'object' pattern and filling that with
> media, along with applying an image_map for the media's colors. The code is
> complex and uses functions, which is why I haven't posted about it yet; it needs
> some detailed comments added, to explain how it works.
>
> Anyway...
>
> Examining your code, it looks like there are two different color schemes for the
> trees, in #macro Tree(rd_)...
>
> #local R1 = rd_;
> #local R2 = RRand(0.0, 1.0, R1);
> #if (R1 < 0.2) // yellowish-green
> #local C_Media = <RRand(180, 200, R1), RRand(180, 200, R1), 90>/255;
> #else // blue-ish
> #local C_Media = <RRand(50, 100, R1), RRand(155, 200, R1), 87>/255;
> #end
>
> ...... but when the macro is actually called later in the 'woods' #while loop to
> create the many trees, it's like this (in two places):
> Tree(0) // zero
>
yeah... there are still a couple of bugs in the code which I have not
yet squashed under my heels. Left overs from Gilles, wild mindless
changes by me, lack of dried frog pills, you name them.
> If I understand the code correctly, that imposes the same 'initial'
> yellowish-green color on *all* the trees-- because 0.0 is always less than
> #if (R1 < 0.2)
> in the macro. To get a good distribution of the TWO colors, I used
> Tree(rand(rd))
> for both of the macro calls in 'woods'. Or maybe some version of RRand(...)
> would work better.
>
> ----------
> [Somewhat off-topic):
> I am also curious about RRand(...) itself, and how it is used here. If rd_ (i.e.
> R1) in the 'Tree' macro *is* 0.0, than that is used as the random-number stream
> for RRand(...). I didn't know that 0.0 could be successfully used for that-- or
> even for seed(0). I have always used at least 1. But zero does work!
>
> I guess I need to take a look at 'math.inc', to see how RRand() is actually
> constructed. And to re-read the docs concerning seed() and rand() too ;-)
>
I love RRand! you have a fine control over the range within which you
want your random number to be. For me, who suffers from some mild
dyscalculia, things remain much clearer. :-/
--
Thomas
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Op 15-12-2021 om 10:12 schreef Mr:
>
> Very exciting! the shading is spot on !
>
Gilles preceded me there. :-)
--
Thomas
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Thomas de Groot <tho### [at] degrootorg> wrote:
> I take the liberty to attach the code here, with the image.
>
> Hope you find it useful.
I will definitely grab this for later tinkering. For some reason I've never been
able to get media to look opaque like this - and this is so simple too! I wonder
what blindingly obvious thing I've been doing wrong...
Thanks for posting!
Bill
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Op 15-12-2021 om 15:34 schreef Bill Pragnell:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> I take the liberty to attach the code here, with the image.
>>
>> Hope you find it useful.
>
> I will definitely grab this for later tinkering. For some reason I've never been
> able to get media to look opaque like this - and this is so simple too! I wonder
> what blindingly obvious thing I've been doing wrong...
>
> Thanks for posting!
> Bill
>
Thanks Bill! Just wait one or two days until I have tracked down the
last bugs.
--
Thomas
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From: Thomas de Groot
Subject: Re: Gilles Tran's media trees as a macro
Date: 16 Dec 2021 08:36:45
Message: <61bb40ed@news.povray.org>
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I believe that I tracked down all the inconsistencies and errors
remaining. The scene file is also easier to use, either as a single tree
tester (change the random seed!) or as a parkland development scheme, by
changing the camera location switch (CamLoc).
The scene file with macro, this time, has been provided in
p.b.scene-files folder under the identical subject line as the present
message.
Enjoy!
--
Thomas
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Attachments:
Download '00-mediatree_test2.jpg' (105 KB)
Preview of image '00-mediatree_test2.jpg'
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