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If it was mostly blue it would look very much like a gas flame. I like it.
Alan
"Gail Shaw" <gsh### [at] monotix coza> wrote in message
news:396c4381@news.povray.org...
> Hi all
>
> I spend most of last night playing with fire (not literally)
> I've got a fairly decent candle flame, so I thought I'd post it.
>
> I'm not totally happy with the shape (difference between
> streched sphere and unscaled sphere)
>
> Main media consists of a gradient y density and a spherical
> density. There is a second object at the bottom to create the blue
> glow.
>
> Comments? suggestions??
>
> Gail
> ********************************************************************
> * gsh### [at] monotixcoza * Reality.dat not found *
> * http://www.rucus.ru.ac.za/~gail/ * Attempting to reboot universe *
> ********************************************************************
> * The best way to accelerate Windows NT is at 9.8 m/s^2 *
> ********************************************************************
>
>
>
>
>
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if you use a color map in your spherical density, you can include all of
the necessary colors. and are you using multiple densities, or multiple
medias? there is quite a difference between them.
Gail Shaw wrote:
>
> Hi all
>
> I spend most of last night playing with fire (not literally)
> I've got a fairly decent candle flame, so I thought I'd post it.
>
> I'm not totally happy with the shape (difference between
> streched sphere and unscaled sphere)
>
> Main media consists of a gradient y density and a spherical
> density. There is a second object at the bottom to create the blue
> glow.
>
> Comments? suggestions??
>
> Gail
> ********************************************************************
> * gsh### [at] monotixcoza * Reality.dat not found *
> * http://www.rucus.ru.ac.za/~gail/ * Attempting to reboot universe *
> ********************************************************************
> * The best way to accelerate Windows NT is at 9.8 m/s^2 *
> ********************************************************************
>
> [Image]
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Bob Hughes wrote:
> How about showing this on a white background? Sorry, I don't really mean that
> :-}
> Candle flames are always much more of a yellow-white than just yellow, I know
> everyone seems to not believe that though.
It also depends on what is burning
> Also varies a lot depending on the
> surrounding light and background, but I still always try for a near white
> yellow which goes to yellow-orange at the edges and top.
> Turbulence is another thing, sometimes there's none sometimes a lot. As far
> as the general shape goes I think you've come close enough but I'd say there's
> not enough blue (or rather invisible) part going up inside the yellow part.
> The amount of the merging parts I'm talking about, maybe more diffused boudary
> line there would be better?
> I found this photo: http://www.hd.org/Damon/photos/_I/cat/lw/eooz2q1mh6.HTM
> and it has no blue base to the flame!
>
> Bob
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ryan constantine wrote in message <396### [at] yahoocom>...
>if you use a color map in your spherical density, you can include all of
>the necessary colors. and are you using multiple densities, or multiple
>medias? there is quite a difference between them.
>
Yup, I know. Multiple densities. I needed another object for the blue as it
was outside of the container object of the rest of the flame.
The spherical density creates the darker patch at the bottom. The gradient
density creates the colours.
Gail
********************************************************************
* gsh### [at] monotixcoza * Reality.dat not found *
* http://www.rucus.ru.ac.za/~gail/ * Attempting to reboot universe *
********************************************************************
* The best way to accelerate Windows NT is at 9.8 m/s^2 *
********************************************************************
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Alan Nickerson wrote in message <396c66ff$1@news.povray.org>...
>If it was mostly blue it would look very much like a gas flame. I like it.
>
didn't think about that, but you're right. I tried a gas flame (with no
source of reference for the colour. It's been 3 years since I last
used a gas flame)
I also played a bit more with the original flame. Not much better
Gail
********************************************************************
* gsh### [at] monotixcoza * Reality.dat not found *
* http://www.rucus.ru.ac.za/~gail/ * Attempting to reboot universe *
********************************************************************
* The best way to accelerate Windows NT is at 9.8 m/s^2 *
********************************************************************
Post a reply to this message
Attachments:
Download 'candle.jpg' (4 KB)
Preview of image 'candle.jpg'
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On Wed, 12 Jul 2000 14:09:44 +0200, Gail Shaw wrote...
> Bob Hughes wrote in message <396c532b@news.povray.org>...
> >How about showing this on a white background? Sorry, I don't really mean
> that
> >:-}
>
> It disappears completely on a white background :-<
Add an Absorption colour which is the inverse of your emission colour,
and it should show up on white backgrounds...
This means, if you have an emission of rgb< 1, 0.2, 0.152 >, the
absorption should be rgb< 0, 0.8, 0.848 >
Bye for now,
Jamie.
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Mmmmm nice flame, looks much more like a cigerett lighter flame
in shape and distribution of colour, but maybe the yellow should
be more white and more red than it is (what I probably mean is
the yellow section needs less green in it).
--
Cheers
Steve email mailto:ste### [at] zeroppsuklinuxnet
%HAV-A-NICEDAY Error not enough coffee 0 pps.
web http://www.zeropps.uklinux.net/
or http://start.at/zero-pps
2:23am up 15 days, 2:04, 2 users, load average: 1.04, 1.05, 1.01
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This amoung the best candle flames I've seen so far. Keep up the good
work.
Ken Matassa
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On Thu, 13 Jul 2000 20:47:13 +0100, jam### [at] dh70qdu-netcom (Jamie
Davison) wrote:
>Add an Absorption colour which is the inverse of your emission colour,
>and it should show up on white backgrounds...
>
>This means, if you have an emission of rgb< 1, 0.2, 0.152 >, the
>absorption should be rgb< 0, 0.8, 0.848 >
Tsk. Add an absorption color that is the inverse of your emission
color _and_has_the_same_brightness_ . Try something like this:
#macro Brightness ( Color )
0.3*Color.r + 0.59*color.g + 0.11*color.b
#end
#macro Inverse_Color ( Color )
#local Jamie_Inverse = <1,1,1>-Color;
Jamie_Inverse / Brightness (Jamie_Inverse) * Brightness (Color)
#end
I hope it works, my newsreader isn't the best way to try out POV code
:)
Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] usanet
TAG e-mail : pet### [at] tagpovrayorg
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On Sun, 16 Jul 2000 02:09:25 +0300, Peter Popov wrote...
> On Thu, 13 Jul 2000 20:47:13 +0100, jam### [at] dh70qdu-netcom (Jamie
> Davison) wrote:
>
> >Add an Absorption colour which is the inverse of your emission colour,
> >and it should show up on white backgrounds...
> >
> >This means, if you have an emission of rgb< 1, 0.2, 0.152 >, the
> >absorption should be rgb< 0, 0.8, 0.848 >
>
> Tsk. Add an absorption color that is the inverse of your emission
> color _and_has_the_same_brightness_ . Try something like this:
<snip>
That would explain why I've only had limited success playing with
emitting media on white backgrounds. Ta.
Mind you, I've not really played that much with media in any serious
manner.
Ah well, that's another piece of (useful) trivia to try and file away in
the POV related section of my brain...
Bye for now,
Jamie.
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