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Am 12.03.2018 um 22:49 schrieb Cousin Ricky:
> In my defense, I did not choose to be an American; the Danish sold my
> island from under me 46 years before I was born.
>
> Although, when I took an online test to see where I should move in the
> extremely unlikely event that Donald Trump should become president, they
> said Germany would be the best match for me. Personally, I say make
> Trump's immigration policy retroactive 2 generations and send /him/ back
> to Germany.
If you ever get your hands on a time machine, be careful - that plan
might backfire. According to German Wikipedia, during WW2 one of The
Don's uncles, John G. Trump, was instrumental in providing the US
military with the latest and greatest Radar equipment, and had also
contributed to the Manhattan Project (albeit involuntarily, by building
a high voltage generator in Philadelphia that was subsequently seized
for the project).
Also, by The Don's standards, there are two types of immigrants:
Norwegians and Bad Hombres. Back in 1885, Germans would certainly have
been considered the Norwegian type.
Post a reply to this message
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"Norbert Kern" <nor### [at] t-online de> wrote:
> Stephen <mca### [at] aolcom> wrote:
>
> > Has anyone tried to produce a solarisation effect?
>
> Hi,
> with a simple approach I got this image - here is the code
> ...
Hi Norbert
Your post inspired me to try to achieve image solarisation with the
new user defined pattern in v3.8:
http://wiki.povray.org/content/Reference:User_Defined_Pattern
BTW: Nice tricks to scale the camera vectors by the image dimensions
and to make a V-function with the max function !
Here's the results from my experiment:
// ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7
// Tor Olav Kristensen
// http://subcube.com
// Solarizing an image
// ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7
#version 3.8;
// For this image made by Gilles Tran:
// http://hof.povray.org/images/glasses.jpg
#declare GuessedGamma = 2.2;
global_settings { assumed_gamma GuessedGamma }
// ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7
// Render with same image dimensions as the original image for best
// result. Anti-aliasing can be used. E.g.: +w1024 +h768 +a0.1 +FJ
#declare PigmentFn =
function {
pigment {
image_map {
jpeg "glasses.jpg" // 1024 x 768 pixels
gamma GuessedGamma
interpolate 2
}
}
}
;
// Frequency = 0.5 and Inverted = true
// - will give original image (approximately)
#declare Frequency = 1.0; // Try 0.5, 1.0, 1.5, 2.0, ...
#declare Inverted = false;
#declare Fn = function(x) { Frequency*mod(x, 1/Frequency) }
#declare VeeFn = function(x) { 2*max(Fn(x), 1 - Fn(x)) - 1 }
#declare InvertedVeeFn = function(x) { 1 - VeeFn(x) };
#if (Inverted)
#declare SolarizeFn = InvertedVeeFn ;
#else
#declare SolarizeFn = VeeFn;
#end // if
box {
<0, 0, 0>, <1, 1, 1>
texture {
pigment {
user_defined {
function { SolarizeFn(PigmentFn(x, y, z).red ) },
function { SolarizeFn(PigmentFn(x, y, z).green) },
function { SolarizeFn(PigmentFn(x, y, z).blue ) }
}
}
finish {
diffuse 0
emission color rgb <1, 1, 1>
}
}
translate -<1, 1, 0>/2
scale <image_width, image_height, 1>
}
// ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7
camera {
orthographic
right image_width*x
up image_height*y
}
// ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7
Post a reply to this message
Attachments:
Download 'solarized glasses.jpg' (77 KB)
Preview of image 'solarized glasses.jpg'
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"Tor Olav Kristensen" <tor### [at] TOBEREMOVEDgmailcom> wrote:
> ...
> // Render with same image dimensions as the original image for best
> // result. Anti-aliasing can be used. E.g.: +w1024 +h768 +a0.1 +FJ
> ...
I just did some layer arithmetic in Gimp with the original image in the bottom
layer and my rendered image in the top layer - and found that Norbert is
probably right: It's best to not use any anti-aliasing for this.
--
Tor Olav
http://subcube.com
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"Tor Olav Kristensen" <tor### [at] TOBEREMOVEDgmailcom> wrote:
>
> Hi Norbert
>
> Your post inspired me to try to achieve image solarisation with the
> new user defined pattern in v3.8:
>
> http://wiki.povray.org/content/Reference:User_Defined_Pattern
Hi Tor,
very well done.
I've to look more in user defined pattern - definitively.
Norbert
Post a reply to this message
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"Norbert Kern" <nor### [at] t-onlinede> wrote:
> "Tor Olav Kristensen" <tor### [at] TOBEREMOVEDgmailcom> wrote:
> >
> > Hi Norbert
> >
> > Your post inspired me to try to achieve image solarisation with the
> > new user defined pattern in v3.8:
> >
> > http://wiki.povray.org/content/Reference:User_Defined_Pattern
>
>
> Hi Tor,
>
> very well done.
> I've to look more in user defined pattern - definitively.
Thank you Norbert
For those of you that hasn't started to experiment with v3.8 yet,
here is some code that can be used with v3.7 to achieve the same:
// ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7
// Tor Olav Kristensen
// http://subcube.com
// Solarizing an image
// ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7
#version 3.7;
// For this image made by Gilles Tran:
// http://hof.povray.org/images/glasses.jpg
#declare GuessedGamma = 2.2;
global_settings { assumed_gamma GuessedGamma }
// ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7
// Render with same image dimensions as the original image for best
// result. E.g.: +w1024 +h768 +FJ
#declare PigmentFn =
function {
pigment {
image_map {
jpeg "glasses.jpg" // 1024 x 768 pixels
gamma GuessedGamma
interpolate 2
}
}
}
;
// Frequency = 0.5 and Inverted = true
// - will give original image (approximately)
#declare Frequency = 1.0; // Try 0.5, 1.0, 1.5, 2.0, ...
#declare Inverted = false;
#declare Fn = function(x) { Frequency*mod(x, 1/Frequency) };
#declare VeeFn = function(x) { 2*max(Fn(x), 1 - Fn(x)) - 1 };
#declare InvertedVeeFn = function(x) { 1 - VeeFn(x) };
#if (Inverted)
#declare SolarizeFn = InvertedVeeFn ;
#else
#declare SolarizeFn = VeeFn;
#end // if
#declare PigmentR =
pigment {
function { SolarizeFn(PigmentFn(x, y, z).red ) }
color_map {
[ 0 color red 0 ]
[ 1 color red 3 ]
}
}
;
#declare PigmentG =
pigment {
function { SolarizeFn(PigmentFn(x, y, z).green) }
color_map {
[ 0 color green 0 ]
[ 1 color green 3 ]
}
}
;
#declare PigmentB =
pigment {
function { SolarizeFn(PigmentFn(x, y, z).blue ) }
color_map {
[ 0 color blue 0 ]
[ 1 color blue 3 ]
}
}
;
box {
<0, 0, 0>, <1, 1, 1>
texture {
pigment {
average
pigment_map {
[ PigmentR ]
[ PigmentG ]
[ PigmentB ]
}
}
finish {
diffuse 0
emission color rgb <1, 1, 1>
}
}
translate -<1, 1, 0>/2
scale <image_width, image_height, 1>
}
// ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7
camera {
orthographic
right image_width*x
up image_height*y
}
// ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7
Post a reply to this message
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Thomas de Groot <tho### [at] degrootorg> wrote:
>
>
> > Very interesting! May I use your p_modify versions for my video
> > experiments on YouTube
> > (https://www.youtube.com/channel/UCFgDHkMGDuOkiSnc6w6eUWg)? To those who
> > modificated it, I ask the same question...
> >
>
> I am working on some general changes of the code, which I shall post
> later. You have my full permission, but And is the real owner/originator.
>
> --
> Thomas
I'm sorry, actually, I saw this method on a website. here:
http://runevision.com/3d/povgoodies/
: Pattern Control Trick
Once I decide to use it. I will find out how it composite. I'm not worried about
the copyright because I think it is just a composite of two original function
provided by POV-Ray.
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