POV-Ray : Newsgroups : povray.general : Flame shape advice Server Time
11 Aug 2024 07:20:29 EDT (-0400)
  Flame shape advice (Message 1 to 2 of 2)  
From: Greg M  Johnson
Subject: Flame shape advice
Date: 13 Aug 1999 12:59:26
Message: <37B44E3D.B0593D1A@geocities.com>
I've seen lots of interesting depictions of flames. The problems with
most of the algorithms I am aware of  are either unnatural edges (such
as a hard sphere cutting through the flame "media") or would involve
unnaturally modelled flames (using sPatch to make a grossly cartoony
flame shape.)    Or at least this is the limit of my understanding.  I
think I have seen excellent-looking jet and rocket exhaust, but this has
too much radial symmetry (?) for my current project.

Are there good examples of algorithms (not just pictures) for say,
-- something like the surface of the sun,
          as if you were just a few hundred meters above it.
-- something like a sun or fireball where there is natural "exinction"
          of flames, perhaps using multiplied densities  ?


I want something that looks like a bonfire, not a candle in a still
room.


Thanks for any pointers.


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From: Xplo Eristotle
Subject: Re: Flame shape advice
Date: 13 Aug 1999 21:47:45
Message: <37B4CAEE.629A@unforgettable.com>
Greg M. Johnson wrote:
> 
> I've seen lots of interesting depictions of flames. The problems with
> most of the algorithms I am aware of  are either unnatural edges (such
> as a hard sphere cutting through the flame "media") or would involve
> unnaturally modelled flames (using sPatch to make a grossly cartoony
> flame shape.)    Or at least this is the limit of my understanding.  I
> think I have seen excellent-looking jet and rocket exhaust, but this has
> too much radial symmetry (?) for my current project.
> 
> Are there good examples of algorithms (not just pictures) for say,
> -- something like the surface of the sun,
>           as if you were just a few hundred meters above it.
> -- something like a sun or fireball where there is natural "exinction"
>           of flames, perhaps using multiplied densities  ?

Well, this wouldn't help you with SHAPE per se, but you could probably
get a neat extinction effect by animating a phase-shift on a texture.

As an aside, phase-shift plus translation of some sort would probably
result in some neat time-lapse cloud animations. I haven't had the time
or processing power to test it, though.

-Xplo


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