hi,

"And" <49341109@ntnu.edu.tw> wrote:
> ...
> Now I know it does not finish yet.

do you always do "blocks", or have you put the texture to use yet?  (thinking,
eg, the distribution 'woodbox.pov' scene, or such)


regards, jr.

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First experiment to apply knot distortion to the base shape.

Very experimental trying. potentiality...?

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Attachments:
Download 'tree knot.png' (911 KB)

Preview of image 'tree knot.png'

"jr" <cre### [at] gmailcom> wrote:
> hi,
>
> "And" <49341109@ntnu.edu.tw> wrote:
> > ...
> > Now I know it does not finish yet.
>
> do you always do "blocks", or have you put the texture to use yet?  (thinking,
> eg, the distribution 'woodbox.pov' scene, or such)
>
>
> regards, jr.

"Now I know it does not finish yet." with this sentence I mean that I cannot
adjust the texture easily. The program outputs the texture result(only shape
distortion detail) --> color apply...to what I want, is semi-automatic.

I did not apply it to 3D models yet. But I know it certainly can apply.
I have tried mesh camera of POV-Ray.

This image is what I want to attach the material. I have made several models,
and I want to sell them on TurboSquid to rescue my poor situation: never
accomplish important things, no income for a long time, ...

I will share the program here in the form of freeware(Not open source), this is
because the program is the first usable one which I develop (To myself
mainly), and it highly dependent on POV-Ray, I know I do not on the step
developing commercial program yet, I need some feedback so.

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Download 'wardrope.png' (1837 KB)

Preview of image 'wardrope.png'

Op 25/05/2022 om 17:32 schreef And:
> First experiment to apply knot distortion to the base shape.
> 
> Very experimental trying. potentiality...?

Oh yes! This looks very knot-like, so to speak. You are on the right 
track indeed.

-- 
Thomas

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Modify it with rather casual, I need 2-3 weeks to arrange the output .inc files.

The knot is an experimental feature.
In fact, I'm not clear on how these knot pattern form in photographs.

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Download 'show tree function.png' (1755 KB)

Preview of image 'show tree function.png'

"And" <49341109@ntnu.edu.tw> wrote:
> Modify it with rather casual, I need 2-3 weeks to arrange the output .inc files.
>
> The knot is an experimental feature.
> In fact, I'm not clear on how these knot pattern form in photographs.

This is entering crazy good level realm ! :-)

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Op 26/05/2022 om 13:42 schreef And:
> Modify it with rather casual, I need 2-3 weeks to arrange the output .inc files.
> 
> The knot is an experimental feature.
> In fact, I'm not clear on how these knot pattern form in photographs.
> 
Well, as knots are cross-sections of branches at different angles, you 
can consider them identical to the main cross-section of the trunk wood. 
Your attempt is very convincing, although - I suppose - your approach to 
generate them is different.

-- 
Thomas

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"Mr" <m******r******at_hotmail_dot_fr> wrote:
>
> This is entering crazy good level realm ! :-)

Thank you.





Thomas de Groot <tho### [at] degrootorg> wrote:
> Op 26/05/2022 om 13:42 schreef And:
> > Modify it with rather casual, I need 2-3 weeks to arrange the output .inc files.
> >
> > The knot is an experimental feature.
> > In fact, I'm not clear on how these knot pattern form in photographs.
> >
> Well, as knots are cross-sections of branches at different angles, you
> can consider them identical to the main cross-section of the trunk wood.
> Your attempt is very convincing, although - I suppose - your approach to
> generate them is different.
>
> --
> Thomas

Different approach...maybe. Totally the concept, it is about... I draw the
standard concentric circles(internal wood pattern) there, but I change the input
coordinate (x, y, z) to (x/factor(..), y/factor(..), z), than it distortion the
original space on x-y plane direction.

The knot is the same. I distortion the pattern shape in a narrow range, (vs r
theta and z)

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"And" <49341109@ntnu.edu.tw> wrote:
> Different approach...maybe. Totally the concept, it is about... I draw the
> standard concentric circles(internal wood pattern) there, but I change the input
> coordinate (x, y, z) to (x/factor(..), y/factor(..), z), than it distortion the
> original space on x-y plane direction.
>
> The knot is the same. I distortion the pattern shape in a narrow range, (vs r
> theta and z)





#declare knot_theta_pos = 0.24*pi;
#declare knot_range = 0.41*pi; // 0.28*pi
#declare knot_h_pos = 1.36;

// simple temp r, not a formal one
#declare f_r_vs_t =
function(var_t, h) {
0.03* var_t
}




// r_of_it means the distant of p to the knot(stem) center line.
// but only approximate.
#declare f_knot_about =
function(var_t, r_of_it) {
select(
    r_of_it - knot_range/2,
    (f_r_vs_t(var_t, 0) +0.001*(cos(r_of_it*2*pi/knot_range) +
1)/2/pow(abs(r_of_it), 1.5)  )/f_r_vs_t(var_t, 0),
    1
)
}

#declare f_knot =
function(x, y, z) {
f_knot_about(time_mockup_function(x, y, z), sqrt(pow(f_theta(x,y) -
knot_theta_pos, 2) + pow((z - knot_h_pos)/f_r(x, y, z), 2)) )
}

// -----------------------------------------
#declare time_mockup_with_knot_function =
function (x, y ,z){
time_mockup_function(
x/f_knot(x, y, z),
y/f_knot(x, y, z),
z
)
}

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"jr" <cre### [at] gmailcom> wrote:
> hi,
>
> "And" <49341109@ntnu.edu.tw> wrote:
> > ...
> > Now I know it does not finish yet.
>
> do you always do "blocks", or have you put the texture to use yet?  (thinking,
> eg, the distribution 'woodbox.pov' scene, or such)
>
>
> regards, jr.


After investigate colors from photo. put them together reluctantly.
I apply this yellow color wood to woodbox.pov, only the container.

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Attachments:
Download 'woodbox test.png' (3516 KB)

Preview of image 'woodbox test.png'