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From: Jörg "Yadgar" Bleimann
Subject: Re: Cylindrical pattern animation - how to get the circles/dots overlap
Date: 12 Jun 2026 18:00:18
Message: <6a2c8172$1@news.povray.org>
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Hi(gh)!
Am 12.06.26 um 21:29 schrieb Bald Eagle:
> plane {z, 0 pigment {function {select (Dots (x, y, z) - Radius, 0, 1)} } }
Just for better understandig: what do the second and third parameters of
select() represent? Are they just compressed rgb vectors, i. e. black
and white?
See you in Khyberspace!
Yadgar
--
VBI BENE, IBI BACTRIA!
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> Just for better understandig: what do the second and third parameters of
> select() represent? Are they just compressed rgb vectors, i. e. black
> and white?
Yes. 0 gets vector-promoted to rgb <0, 0, 0>, and 1 gets vector-promoted to rgb
<1, 1, 1>.
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From: Jörg "Yadgar" Bleimann
Subject: Re: Cylindrical pattern animation - how to get the circles/dots overlap
Date: 13 Jun 2026 07:40:02
Message: <6a2d4192$1@news.povray.org>
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Hi(gh)!
Am 13.06.26 um 03:03 schrieb Bald Eagle:
>
>> Just for better understandig: what do the second and third parameters of
>> select() represent? Are they just compressed rgb vectors, i. e. black
>> and white?
>
> Yes. 0 gets vector-promoted to rgb <0, 0, 0>, and 1 gets vector-promoted to rgb
> <1, 1, 1>
Are you sure? If I replace them with actual color vectors, I get the
error message "Parse Error: Expected 'operand', color
keyword 'rgb' found instead"! How can I use real colors instead?
See you in Khyberspace!
Yadgar
--
VBI BENE, IBI BACTRIA!
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> Are you sure? If I replace them with actual color vectors, I get the
> error message "Parse Error: Expected 'operand', color
> keyword 'rgb' found instead"!
Absolutely.
You are trying to shove a keyword and a vector into a scalar-only function that
gets parsed by the function VM.
> How can I use real colors instead?
Use a pigment_map. or a color_map.
In that case, you can even get rid of the select() statement.
The _maps do exactly that: they map the output values of your function to
colors, pigments, textures, normals, or materials.
color_map {
[ 0.0 rgb <0, 0, 0>]
[ 0.5 rgb <0, 0, 0>]
[ 0.5 rgb <1 ,1 ,1>]
[ 1.0 rgb <1 ,1 ,1>]
}
Double entries at 0.5 give a hard transition.
Now any value below 0.5 will be black, and any value above 0.5 will be white.
- BE
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From: Jörg "Yadgar" Bleimann
Subject: Re: Cylindrical pattern animation - how to get the circles/dots overlap
Date: 13 Jun 2026 09:31:32
Message: <6a2d5bb4$1@news.povray.org>
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Hi(gh)!
Am 13.06.26 um 13:57 schrieb Bald Eagle:
> Use a pigment_map. or a color_map.
>
> In that case, you can even get rid of the select() statement.
>
> The _maps do exactly that: they map the output values of your function to
> colors, pigments, textures, normals, or materials.
>
> color_map {
> [ 0.0 rgb <0, 0, 0>]
> [ 0.5 rgb <0, 0, 0>]
> [ 0.5 rgb <1 ,1 ,1>]
> [ 1.0 rgb <1 ,1 ,1>]
> }
>
> Double entries at 0.5 give a hard transition.
> Now any value below 0.5 will be black, and any value above 0.5 will be white.
I tried this, but now I get rings rather than growing solid black dots,
as you can see in the attachment (clock=20)!
See you in Khyberspace!
Yadgar
--
VBI BENE, IBI BACTRIA!
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Attachments:
Download 'baldeagle_test.png' (20 KB)
Preview of image 'baldeagle_test.png'
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> > In that case, you can even get rid of the select() statement.
Scratch that. Keep the select () statement.
> I tried this, but now I get rings
You'll get solid dots with select.
- BE
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From: Jörg "Yadgar" Bleimann
Subject: Re: Cylindrical pattern animation - how to get the circles/dots overlap
Date: 13 Jun 2026 12:32:01
Message: <6a2d8601@news.povray.org>
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Am 13.06.26 um 17:25 schrieb Bald Eagle:
> You'll get solid dots with select.
...but then, again, no other colors than black and white?
--
VBI BENE, IBI BACTRIA!
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> > You'll get solid dots with select.
>
> ...but then, again, no other colors than black and white?
No.
The original function that uses select () outputs either 0 or 1.
You feed the result into a color_map, which allows you to use rgb colors.
- BE
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From: Jörg "Yadgar" Bleimann
Subject: Re: Cylindrical pattern animation - how to get the circles/dots overlap
Date: 14 Jun 2026 12:40:42
Message: <6a2ed98a@news.povray.org>
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Hi(gh)!
Am 13.06.26 um 18:39 schrieb Bald Eagle:
> No.
> The original function that uses select () outputs either 0 or 1.
> You feed the result into a color_map, which allows you to use rgb colors.
Ah yes, I understood... here is what I got - thank you for your help!
See you in Khyberspace!
Yadgar
--
VBI BENE, IBI BACTRIA!
Post a reply to this message
Attachments:
Download 'laptopkaufen_12.gif' (4270 KB)
Preview of image 'laptopkaufen_12.gif'
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hi,
=?UTF-8?Q?J=C3=B6rg_=22Yadgar=22_Bleimann?= <yaz### [at] gmx de> wrote:
> Hi(gh)!
> ... here is what I got ...
if your mate still doesn't buy a new laptop now, idk, will you (need to) break
arms ?! </grin>
regards, jr.
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