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Hi all,
I think this question belongs here, but I am unsure. I suspect it is a
newbee question, apologies if it has already been answered somewhere else:
I have a cylindrical shape that contains an emission media, however I wanted
to vary the density, so that it decayed exponentially (preferably but linear
would do) as it approached the edge of the shape, after several hours trying
to play around with it I though I would ask for help.
A second question I have is as to the interaction between media, radiosity
and animations. Will either media or radiosity produce a 'gitter' effect
that is caused by random sampling, e.g. jitter and/or crand keywords?
The code is below:
#include "colors.inc"
#include "metals.inc"
camera {
location <0, 20, -10>
look_at <0,0,0>
}
light_source {
<0, 10, -15>
color rgb <1, 1, 1>
}
light_source {
<0, 2.25, 5>
color rgb <1, 1, 1>
}
difference {
cylinder { file://Main Cylinder
<0, 10, 0>,
<0, 0, 0>,
2.5
pigment { rgbf <0.5, 0.5, 0.5, 1>}
finish { ambient rgb <0.5, 0.11, 0.1> }
interior {
media {
intervals 10
samples 1, 1
emission rgb <0.75, 0.75, 0.75>
scattering { 1, 0.5}
confidence 0.9
variance 1/128
density {cylindrical
color_map {
[0.0 rgb <1, 0, 0>]
[0.5 rgb <0.5, 0, 0.5>]
[1.0 rgb <0,0,1>]
}
}
}
}
hollow on
}
cylinder { file://Cut-away
<0, -1, 0>
<0, 11, 0>
2
pigment { rgb <1, 0, 0> }
}
}
Many thanks to everyone,
Luke Church
PS - Damned Outlook Express has converted my comments into ftp links -
please ignore them!
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Luke Church <Luk### [at] church karoocouk> wrote:
: I have a cylindrical shape that contains an emission media, however I wanted
: to vary the density, so that it decayed exponentially (preferably but linear
: would do) as it approached the edge of the shape
Sorry, you will have to be more concise about this. Your shape is right
now a tube (a cylinder with another smaller cylinder cutting a hole in it).
Which edge? The outer edge? The inner edge? Both? Or should the media cover
the entire volume of the main cylinder?
--
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/
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In article <3976fd4b@news.povray.org>, "Luke Church"
<Luk### [at] churchkaroocouk> wrote:
> I have a cylindrical shape that contains an emission media, however I
> wanted to vary the density, so that it decayed exponentially
> (preferably but linear would do) as it approached the edge of the
> shape, after several hours trying to play around with it I though I
> would ask for help.
Try the poly_wave waveform:
density {cylindrical poly_wave 2
color_map {
[0.0 rgb <1, 0, 0>]
[0.5 rgb <0.5, 0, 0.5>]
[1.0 rgb <0,0,1>]
}
}
You could also adjust the color_map to get close to the same effect, but
it would be more difficult.
> A second question I have is as to the interaction between media,
> radiosity and animations. Will either media or radiosity produce a
> 'gitter' effect that is caused by random sampling, e.g. jitter and/or
> crand keywords?
In the official version, radiosity currently doesn't work well with
media. Specifically, the radiosiy samples never enter the container
object, and media isn't calculated for the radiosity samples. MegaPOV
fixes this, and these changes will probably make it into the next
official release.
As for the "gitter" effect...were you trying to type "glitter" or
"jitter"? Oh, well...both media and radiosity can produce random
effects, though these can be minimized with certain settings. This is
easier to do with MegaPOV radiosity and media method 3...with the
official version, you basically have to increase your samples and adjust
variance and confidence until the "grainyness" isn't visible enough to
be a problem. This can be very slow...though emitting media is probably
the fastest.
I don't have any experience with radiosity, so I can't help you there.
> PS - Damned Outlook Express has converted my comments into ftp links -
> please ignore them!
You can get around this by using "// comment" instead of "//comment".
The extra space after the slashes keeps it from happening.
--
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/
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Basically you can't with that emission plus non-zero density. You need to
have the 0.0 index of your density map drop to nothing (rgb 0) to have it
fade at the edge.
Adding some 'absorption' might be okay too.
Good luck animating within a reasonable time-frame with good enough settings
to keep the "jitter" effect in check.
Bob
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"Warp" <war### [at] tagpovrayorg> wrote in message
news:3977059c@news.povray.org...
> Luke Church <Luk### [at] churchkaroocouk> wrote:
> : I have a cylindrical shape that contains an emission media, however I
wanted
> : to vary the density, so that it decayed exponentially (preferably but
linear
> : would do) as it approached the edge of the shape
>
> Sorry, you will have to be more concise about this. Your shape is right
> now a tube (a cylinder with another smaller cylinder cutting a hole in
it).
> Which edge? The outer edge? The inner edge? Both? Or should the media
cover
> the entire volume of the main cylinder?
Terribly sorry, I meant that you have a tube and the media should be the
densest at the inner edge of the tube and should be ~0 at the outer edge of
the tube.
Thanks for the very swift reply,
Luke
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"Chris Huff" <chr### [at] maccom> wrote in message
news:chrishuff-C182AA.09052920072000@news.povray.org...
> You can get around this by using "// comment" instead of "file://comment.
... But he didn't write file://comment, he wrote file://comment - it was
outlook that added the file: to file://comment making it file://comment when
originally it just said file://comment ;)
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In article <397720dd$1@news.povray.org>, "Tom Melly"
<tom### [at] tomandluf9couk> wrote:
> ... But he didn't write file://comment, he wrote file://comment - it
> was outlook that added the file: to file://comment making it
> file://comment when originally it just said file://comment ;)
BTW, Outlook isn't the only program with this problem. MT-NewsWatcher
also has this "feature".
--
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/
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Tom Melly wrote:
>
> "Chris Huff" <chr### [at] maccom> wrote in message
> news:chrishuff-C182AA.09052920072000@news.povray.org...
>
> > You can get around this by using "// comment" instead of "file://comment.
>
> ... But he didn't write file://comment, he wrote file://comment - it was
> outlook that added the file: to file://comment making it file://comment when
> originally it just said file://comment ;)
I'm sorry but I can't comment on that.
--
Ken Tyler - 1400+ POV-Ray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/
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On Thu, 20 Jul 2000 16:55:05 +0100, Tom Melly wrote:
>"Chris Huff" <chr### [at] maccom> wrote in message
>news:chrishuff-C182AA.09052920072000@news.povray.org...
>
>> You can get around this by using "// comment" instead of "file://comment.
>
>... But he didn't write file://comment, he wrote file://comment - it was
>outlook that added the file: to file://comment making it file://comment when
>originally it just said file://comment ;)
Those of us not using the big wide-open security hole from Microsoft know
you faked that.
--
Ron Parker http://www2.fwi.com/~parkerr/traces.html
My opinions. Mine. Not anyone else's.
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"Ron Parker" <ron### [at] povrayorg> wrote in message
news:slr### [at] linuxparkerrfwicom...
>
> Those of us not using the big wide-open security hole from Microsoft know
> you faked that.
>
Did not! (did I? - I thought I didn't but now I've got no way of knowing -
damn you MS, from the cold heart of hell I stab at thee).
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