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5 Jul 2022 20:25:13 EDT (-0400)
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From: And
Subject: A special texture with circle
Date: 15 May 2022 11:05:00
Message: <web.62811626b878eec1a7adfb56aa81652d@news.povray.org>
When I tried to combine function to form a wood bumps pattern, I create a
interesting picture. With concentric circles.


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From: Bald Eagle
Subject: Re: A special texture with circle
Date: 15 May 2022 12:00:00
Message: <web.628123551ed36dd1f9dae3025979125@news.povray.org>
"And" <49341109@ntnu.edu.tw> wrote:
> When I tried to combine function to form a wood bumps pattern, I create a
> interesting picture. With concentric circles.

This would probably look _really_ cool as a height field!


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From: Thomas de Groot
Subject: Re: A special texture with circle
Date: 16 May 2022 02:23:15
Message: <6281edd3$1@news.povray.org>
Op 15/05/2022 om 17:03 schreef And:
> When I tried to combine function to form a wood bumps pattern, I create a
> interesting picture. With concentric circles.

This looks interesting indeed, and unexpected. Could this be used for 
palm wood, maybe? With less marked rings, it would come close I guess. 
And as a height_field, as Bald Eagle suggested.

-- 
Thomas


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From: jr
Subject: Re: A special texture with circle
Date: 16 May 2022 03:15:00
Message: <web.6281f9081ed36dd879e196a6cde94f1@news.povray.org>
hi,

"Bald Eagle" <cre### [at] netscapenet> wrote:
> "And" <49341109@ntnu.edu.tw> wrote:
> > When I tried to combine function to form a wood bumps pattern, I create a
> > interesting picture. With concentric circles.

very nice indeed.


> This would probably look _really_ cool as a height field!

heh, I think it'd look cool printed on cloth or canvas, and hung on a wall; I
keep thinking "tie-dyed".


regards, jr.


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From: And
Subject: Re: A special texture with circle
Date: 16 May 2022 03:30:00
Message: <web.6281fc961ed36ddd2153b25aa81652d@news.povray.org>
"jr" <cre### [at] gmailcom> wrote:
> hi,
>
> "Bald Eagle" <cre### [at] netscapenet> wrote:
> > "And" <49341109@ntnu.edu.tw> wrote:
> > > When I tried to combine function to form a wood bumps pattern, I create a
> > > interesting picture. With concentric circles.
>
> very nice indeed.
>
>
> > This would probably look _really_ cool as a height field!
>
> heh, I think it'd look cool printed on cloth or canvas, and hung on a wall; I
> keep thinking "tie-dyed".
>
>
> regards, jr.

Print on cloth, etc sounds like it has some (emotionally) meaning. In fact I
leave this picture(and code) for this reason.


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From: And
Subject: Re: A special texture with circle
Date: 16 May 2022 03:40:00
Message: <web.6281feb41ed36ddd2153b25aa81652d@news.povray.org>
"Bald Eagle" <cre### [at] netscapenet> wrote:
> "And" <49341109@ntnu.edu.tw> wrote:
> > When I tried to combine function to form a wood bumps pattern, I create a
> > interesting picture. With concentric circles.
>
> This would probably look _really_ cool as a height field!

Why? I don't imagine it so clear.



This pattern here: --------------------------

// basic functions -----

#declare f_theta =
function(x, y) {
select(y, 2*pi - acos(x/sqrt(x*x + y*y)) , acos(x/sqrt(x*x + y*y)))
}


#declare f_r =
function(x, y) {
sqrt(x*x + y*y)
}


#declare f_noise3d = function { internal(76) }


// theme -----





#declare f_rising_noise =
function (x, y) {
f_r(x, y) * f_noise3d(x*5, y*5, 0)

}


#declare f_bumps =
function {f_noise3d(x, y, z)}



#declare radial_growth_speed = 0.1; // m/year


#declare f_time_mockup =
function(x, y, z) {
f_r(x, y)/radial_growth_speed
}



#declare feather_extent = 2.3;

#declare f_t_noise_apply =
function(var_t, change_value) {
f_noise3d(var_t*feather_extent, change_value*50, 200)
}



#declare f_result =
function (x,y) {
f_t_noise_apply(
f_time_mockup(x, y, 0),
f_bumps(f_rising_noise(x, y)*2, 0, 0) // change value
)
}


// ---------------------------------------

Then it can show on a x - y plane. range -5 < x < 5,    -5 < y < 5


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From: And
Subject: Re: A special texture with circle
Date: 16 May 2022 03:45:00
Message: <web.628200da1ed36ddd2153b25aa81652d@news.povray.org>
And the color:


// ------------------------------


texture{
    pigment{
        function{f_result(x,y)}
        color_map{
            [0 rgb<0.1,0.1,0.1>]
            [0.4 rgb<0.2,0.2,0.2>]
            [0.6 rgb<0.65,0.45,0.45>]
            [1 rgb<1.0,0.35,0.3>]
        }

    }
    finish{
        ambient 1
        diffuse 0
    }
}


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From: And
Subject: Re: A special texture with circle
Date: 16 May 2022 03:50:00
Message: <web.628201121ed36ddd2153b25aa81652d@news.povray.org>
Thomas de Groot <tho### [at] degrootorg> wrote:
> Op 15/05/2022 om 17:03 schreef And:
> > When I tried to combine function to form a wood bumps pattern, I create a
> > interesting picture. With concentric circles.
>
> This looks interesting indeed, and unexpected. Could this be used for
> palm wood, maybe? With less marked rings, it would come close I guess.
> And as a height_field, as Bald Eagle suggested.
>
> --
> Thomas

Ha ha... I don't know.


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From: jr
Subject: Re: A special texture with circle
Date: 16 May 2022 07:05:00
Message: <web.62822eca1ed36dd879e196a6cde94f1@news.povray.org>
hi,

"And" <49341109@ntnu.edu.tw> wrote:
> "jr" <cre### [at] gmailcom> wrote:
> > ...
> > heh, I think it'd look cool printed on cloth or canvas, and hung on a wall; I
> > keep thinking "tie-dyed".
>
> Print on cloth, etc sounds like it has some (emotionally) meaning.

not sure about that, but I do have a distinct liking for decorative, woven
materials.  if I saw a piece of fabric with such an unusual pattern/print in the
town's market, I'd be sorely tempted to buy.  :-)


regards, jr.


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From: And
Subject: Re: A special texture with circle
Date: 17 May 2022 11:45:00
Message: <web.6283c24e1ed36ddd2153b25aa81652d@news.povray.org>
"jr" <cre### [at] gmailcom> wrote:
> hi,
>
> "And" <49341109@ntnu.edu.tw> wrote:
> > "jr" <cre### [at] gmailcom> wrote:
> > > ...
> > > heh, I think it'd look cool printed on cloth or canvas, and hung on a wall; I
> > > keep thinking "tie-dyed".
> >
> > Print on cloth, etc sounds like it has some (emotionally) meaning.
>
> not sure about that, but I do have a distinct liking for decorative, woven
> materials.  if I saw a piece of fabric with such an unusual pattern/print in the
> town's market, I'd be sorely tempted to buy.  :-)
>
>
> regards, jr.

Wow


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