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From: William F Pokorny
Subject: Example of Isosurface star fields.
Date: 20 Dec 2013 06:11:14
Message: <52b425d2@news.povray.org>
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All, Thought I'd pass along another variation of Sam's silhouette image
to isosurface technique. This one showing how to make planar isosurface
star fields. Though the max gradient must be relatively high here – I
used 512 – most any 2D image can be made an isosurface with a function
like : abs(z*(1000/9))+Fnct00(x,y,z).grey-0.52. The value 9 sets a z
thickness of roughly 18/1000 for full black pixels and less thick for
grey moving to white. The images need to be relatively large. I've been
using 1000x1000 to 2500x2500 pixels.
Start with an image like blurExample.jpg (scaled down as posted for file
size) where the background “star field” has been created with GIMP's
dotify command. With a GIMP pencil I wrote on another GIMP layer
“POV-Ray 3.7” and heavily blurred the layer. The opacity of the written
layer was adjust downward to about 25% over the “dotify” layer. Idea is
to create the base star field with dotify then darken it slightly to
create areas of more stars.
The rendered example result (<30 seconds on i7-920) is shown in
StarFieldExample.jpg. Another variation can be seen in MadOfStars960.jpg
where the GIMP supernova effect was used post povray for the supernova.
The colors in the stars in the star field, of the blob-ish shapes, was
set with several colored lights variously positioned.
Funct00 is something like :
pigment{image_map {"blur.png" gamma 1.0 once map_type 0 interpolate 3 }}
If the opacity of the written layer is 100% the writing becomes solid,
rounded letters.
Have fun.
Bill P.
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Attachments:
Download 'starfieldexample.jpg' (188 KB)
Download 'madofstars960.jpg' (195 KB)
Download 'blurexample.jpg' (107 KB)
Preview of image 'starfieldexample.jpg'
Preview of image 'madofstars960.jpg'
Preview of image 'blurexample.jpg'
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From: Thomas de Groot
Subject: Re: Example of Isosurface star fields.
Date: 20 Dec 2013 07:17:55
Message: <52b43573@news.povray.org>
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That is fascinating indeed. Very worthwhile to try out.
Just for a reminder: what is the (exact) name of Sam's macro again? I
have so many macro's by Sam that I am lost (or I may have missed it, of
course). Thanks.
Thomas
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Am 20.12.2013 12:11, schrieb William F Pokorny:
> The rendered example result (<30 seconds on i7-920) is shown in
> StarFieldExample.jpg. Another variation can be seen in MadOfStars960.jpg
> where the GIMP supernova effect was used post povray for the supernova.
MadOfStars960.jpg looks absolutely /fantastic/!
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On 12/20/2013 07:17 AM, Thomas de Groot wrote:
> That is fascinating indeed. Very worthwhile to try out.
>
> Just for a reminder: what is the (exact) name of Sam's macro again? I
> have so many macro's by Sam that I am lost (or I may have missed it, of
> course). Thanks.
>
> Thomas
Thanks.
See p.bscene-files : "ToVolume: Object-To-Volume Conversion and
Rendering Process".
Note. With that include he provided an all POV-Ray canned process for
converting any object into a 3D isosurface using generated, stacked
blurred-image planes. I've been working mostly outside his include,
though using his blurred image technique via GIMP with just one plane,
one image, as the basis for various isosurfaces.
The blurred image technique at the core of his ToVolume include is a
remarkably flexible and easy way to "create" isosurfaces. It is
basically 2D image -> blur(1) -> save-image and render.
While I'd used images to deform isosurfaces, I did not get that 2D
images alone could define isosurfaces until I saw Sam was doing exactly
this (and more) in his ToVolume include.
Bill P.
(1) - The blur rounds, sets the 1-0 gradient and effectively sets the
max depth of any further isosurface surface deformation.
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On 12/20/2013 07:49 AM, clipka wrote:
> Am 20.12.2013 12:11, schrieb William F Pokorny:
>
>> The rendered example result (<30 seconds on i7-920) is shown in
>> StarFieldExample.jpg. Another variation can be seen in MadOfStars960.jpg
>> where the GIMP supernova effect was used post povray for the supernova.
>
> MadOfStars960.jpg looks absolutely /fantastic/!
>
Thank you.
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clipka <ano### [at] anonymous org> wrote:
> Am 20.12.2013 12:11, schrieb William F Pokorny:
>
> > The rendered example result (<30 seconds on i7-920) is shown in
> > StarFieldExample.jpg. Another variation can be seen in MadOfStars960.jpg
> > where the GIMP supernova effect was used post povray for the supernova.
>
> MadOfStars960.jpg looks absolutely /fantastic/!
A new wonderfull constellation!
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Thanks Bill! I found it now in my collection but have not had yet really
time to play with it.
Thomas
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On 20-12-2013 13:49, clipka wrote:
> Am 20.12.2013 12:11, schrieb William F Pokorny:
>
>> The rendered example result (<30 seconds on i7-920) is shown in
>> StarFieldExample.jpg. Another variation can be seen in MadOfStars960.jpg
>> where the GIMP supernova effect was used post povray for the supernova.
>
> MadOfStars960.jpg looks absolutely /fantastic/!
>
I always thought that "there was more between Heaven and Earth..." :-)
Thomas
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William F Pokorny <ano### [at] anonymousorg> wrote:
> The rendered example result (<30 seconds on i7-920) is shown in
> StarFieldExample.jpg. Another variation can be seen in MadOfStars960.jpg
> where the GIMP supernova effect was used post povray for the supernova.
Fantastic Bill, I love these; coincidentally the new topic the for TC-RTC is
"Stars" (hint, hint)
Cheers,
Rob
-------------------------------------------------
www.McGregorFineArt.com
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On 21-12-2013 20:13, Robert McGregor wrote:
> Fantastic Bill, I love these; coincidentally the new topic the for TC-RTC is
> "Stars" (hint, hint)
Hmm... "Star" (no plural) :-)
Thomas
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Le 22/12/2013 09:01, Thomas de Groot nous fit lire :
> On 21-12-2013 20:13, Robert McGregor wrote:
>> Fantastic Bill, I love these; coincidentally the new topic the for
>> TC-RTC is
>> "Stars" (hint, hint)
>
> Hmm... "Star" (no plural) :-)
>
So, definitely a single star. hmmm, so many to choose from, only one to
keep.
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On 22-12-2013 10:29, Le_Forgeron wrote:
> Le 22/12/2013 09:01, Thomas de Groot nous fit lire :
>> On 21-12-2013 20:13, Robert McGregor wrote:
>>> Fantastic Bill, I love these; coincidentally the new topic the for
>>> TC-RTC is
>>> "Stars" (hint, hint)
>>
>> Hmm... "Star" (no plural) :-)
>>
> So, definitely a single star. hmmm, so many to choose from, only one to
> keep.
>
That is to make the challenge more... challenging ;-)
Thomas
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Thomas de Groot <tho### [at] degrootorg> wrote:
> >>
> >> Hmm... "Star" (no plural) :-)
> >>
> > So, definitely a single star. hmmm, so many to choose from, only one to
> > keep.
> >
>
> That is to make the challenge more... challenging ;-)
>
> Thomas
Bill,
don't display Alice Cooper in front of the sun. Two stars, rejected ;P
No, Thomas is only joking. Your Madofstars image is wonderful, a "new
constellation". Why not add a planet surface to the ground and add it to the
contest? Be aware that entries to the new challenge are possible after the
voting for the actual round is finished only. So you have time to new years eve
(and the following four months) to consider this issue.
Best regards,
Michael
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On 12/22/2013 03:44 PM, MichaelJF wrote:
> Bill,
>
> don't display Alice Cooper in front of the sun. Two stars, rejected ;P
>
> No, Thomas is only joking. Your Madofstars image is wonderful, a "new
> constellation". Why not add a planet surface to the ground and add it to the
> contest? Be aware that entries to the new challenge are possible after the
> voting for the actual round is finished only. So you have time to new years eve
> (and the following four months) to consider this issue.
>
> Best regards,
> Michael
>
Alice Cooper eh? ;-)
With the longer time period perhaps I'll manage something. I've started
more complicated images many a time. Always seems real life gets in the
way, or as likely, I get distracted by something shiny.
Bill P.
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>Thomas de Groot on date 22/12/2013 9.01 wrote:
> On 21-12-2013 20:13, Robert McGregor wrote:
>> Fantastic Bill, I love these; coincidentally the new topic the for
>> TC-RTC is
>> "Stars" (hint, hint)
>
> Hmm... "Star" (no plural) :-)
>
> Thomas
>
>
Perhaps a single star... with a lot of stars as background?
;-)
Paolo
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