"Marc-Hendrik Bremer" <Mar### [at] t-onlinede> wrote in message
news:3958c8eb@news.povray.org...
| Bob Hughes schrieb in Nachricht <3958aeac@news.povray.org>...
| >I had to wonder of your comment Marc-Hendrik, I thought it looked overly
| >blazing already.  The top-near log is burning consumingly seemed to me so I
| >even tried to -- ahem -- water it down.
|
| Hope I get that right :-)
| It seems to me that your fire must burn some time already, because it is so
| bright between the logs. In doing so, it would have fired the hole log from
| 'left to right' and I would suppose there were at least some flames or a
| little glow at the end-'cabs'. Anyway, it is kind of nit-picking and it is
| always easier to criticise.
| My wife just fired up our fire-place and in there it is even so, that the
| logs most of the time don't even burn in the middle but on the edges - but
| we make more 'camp-fire'-like and cone-shaped fires in there. So I really
| don't know if it would be the same with this 'layered logs'.
|
| Hope this was a little bit clearer - if not, just ignore this part of my
| last reply, please :~)

I know what you are saying now, so I won't "ignore"  :-)
I'd have to guess that many times a fire burns only in the middle, non-dry
wood for example.  My knowledge of fireplaces and campfires is probably
average (maybe).
Attached is a new fire using a rotated (and a turbulent) 'marble' instead of
'gradient y' to try and get better variations front to back this time.  I
wouldn't call it a great success.  There are also two 'media' in one
'interior' to get the blue part below, and that needs to be diminished or
changed some.  Next I'll try a density_map instead, that should work out far
better.  This one was very slow to render, being about 1h45m for a smaller
res. and no AA; bad radiosity settings too.
I'm also going to move on to split logs instead of these whole ones.
Surprised no one mentioned that first thing.
Thanks for the comments.

Bob

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Attachments:
Download 'fprmarble.jpg' (14 KB)

Preview of image 'fprmarble.jpg'

"Mick Hazelgrove" <mic### [at] mhazelgrovefsnetcouk> wrote in message
news:3958f35a@news.povray.org...
| Superb logs, nice fire - wish I was there!

Well, you can't be.  No one can, if you know what I mean.  Thanks, hopefully
I'll get it to be satisfactory before I give up on it altogether.

Bob

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Bob Hughes wrote:

> Hi everyone.  Someone (or 2) had brought up the subject of "fire" once again,
> so...
> Here's two renders, first done with radiosity and second without (and a few
> minor changes made).  The radiosity has promise but it sure changes everything
> so I can't really judge by a non-radiosity rendering test.  All takes time as
> you all know.  Anyway, 2h18m for radiosity, 1h33m without.  Two area lights
> used and function 'func_9' for the isosurfaced logs, a turbulent gradient y
> media for the fire itself.
> Is it any good at all, is the question.  What do you think?  Never mind the
> compression artifacts and general scene please  ;-)

I don't know anything about radiosity or media, but I know that logs burn
better if they are stacked vertically and when there are several of them.

Nice flames. The ones in the bottom image looks best.


Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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Bob, that last post was awesome! :)
Have you tried to reproduce glowing portions of the wood? I know these
texture/object definitions get out of hand quickly, but this is SO close! ;)

Grim

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Bob Hughes wrote:
> 
> Hi everyone.  Someone (or 2) had brought up the subject of "fire" once again,
> so...
> Here's two renders, first done with radiosity and second without (and a few
> minor changes made).  The radiosity has promise but it sure changes everything
> so I can't really judge by a non-radiosity rendering test.  All takes time as
> you all know.  Anyway, 2h18m for radiosity, 1h33m without.  Two area lights
> used and function 'func_9' for the isosurfaced logs, a turbulent gradient y
> media for the fire itself.
> Is it any good at all, is the question.  What do you think?  Never mind the
> compression artifacts and general scene please  ;-)
> 
> Bob

I especially like the brick walls of the fireplace.  Fire itself looks very
convincing - I don't know much about media.  

One thing I miss is the ashes below the grate (is that the right word?).  Maybe
some isosurface using crackle pattern ...

Christoph

--
Christoph Hormann <chr### [at] gmxde>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/

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The flames now convince even me :-)
That blue is indeed not right (to me) - why should it be under the logs? Mix
it up with the lower part of the flames if possible. Hm, perhaps it would be
good to put some red and orange in parts of the pigment of the logs? They
are glowing ... or is it already in there?

Hope I can get sometime as near to 'reality' as you are with this one.

Marc-Hendrik

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"GrimDude" <vos### [at] yahoocom> wrote in message
news:39590605@news.povray.org...
| Bob, that last post was awesome! :)
| Have you tried to reproduce glowing portions of the wood? I know these
| texture/object definitions get out of hand quickly, but this is SO close! ;)

Thanks, I think it's something seen differently by different people.  It
actually already does have glowing red parts on them, kind of blending into
the flames.  I used a 'spherical' pattern to apply a 'texture_map' of
'crackle' in the central part and 'onion' then 'wood' for the outer parts.
Radiosity is wreaking havoc on the fire and logs causing the textures to all
but disappear.

Bob

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"Marc-Hendrik Bremer" <Mar### [at] t-onlinede> wrote in message
news:39591ae1$1@news.povray.org...
| The flames now convince even me :-)
| That blue is indeed not right (to me) - why should it be under the logs? Mix
| it up with the lower part of the flames if possible. Hm, perhaps it would be
| good to put some red and orange in parts of the pigment of the logs? They
| are glowing ... or is it already in there?
|
| Hope I can get sometime as near to 'reality' as you are with this one.

Hope so too, I can't go it alone.  Glad you are liking it.
There is a bright red 'crackle' pattern included into a 'spherical'
'texture_map' on the logs but radiosity is changing much of the way it looks
to where you can't really see the log texture very well.
Another render has finished so I'll be uploading that.

Bob

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"Tor Olav Kristensen" <tto### [at] onlineno> wrote in message
news:39590504.85E83E96@online.no...
|
| I don't know anything about radiosity or media, but I know that logs burn
| better if they are stacked vertically and when there are several of them.
|
| Nice flames. The ones in the bottom image looks best.

Well, that would be the non-radiosity one  ;-)  I've since changed the logs a
bit but not much different from these.  I probably should put some effort into
placing the logs, they weren't checked from all sides first.
Maybe you will like the next one I'm about to post too.  It didn't go exactly
right at all though  :-(

Bob

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"Christoph Hormann" <Chr### [at] schunteretctu-bsde> wrote in message
news:39590960.29F4E60A@schunter.etc.tu-bs.de...
|
| I especially like the brick walls of the fireplace.  Fire itself looks very
| convincing - I don't know much about media.
|
| One thing I miss is the ashes below the grate (is that the right word?).
Maybe
| some isosurface using crackle pattern ...

I'd call it a "grate", yeah.  The high viewpoint of the camera combined with
very low logs is hiding the ashes and hot embers a lot.  There actually is a
'granite', 'crackle', 'granite' pattern there using a 'spherical'
'texture_map', much the same as I did with the log texturing.  I went with
trying to get a reflection off of the outer hearth instead... a mistake I
guess.  Hmm, no one going to mention it's all one-piece slabs around the
fireplace?  Okay by me  :-)

Bob

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