On 12-5-2019 2:23, Jörg "Yadgar" Bleimann wrote:
> Hi(gh)!
> 
> And once more digging in the history of POV-Ray... and perhaps finding 
> something to adopt for own projects.
> 
> Heiko Rappich asked on 1998-10-21 how to create realistic flames with 
> POV-Ray 3.1 - he previously used the "halo" feature of 3.02 and wondered 
> why the media looks so transparent (first and second images attached here).
> 
> (and I wonder why the rendering in 3.1 looks so much darker and grainier 
> than the one done with 3.7... and how abysmally slow my old laptop is 
> compared to my hexacore main computer!)
> 
> The original thread can be found here: 
>
http://news.povray.org/povray.binaries.scene-files/thread/%3C362E409A.6AEB3235%40t-online.de%3E/?ttop=426795&toff=1431

> 
> 
> Then three fellow POVers came upw with suggestions, first Ken Tyler: 
> "Lower filter value of pigment" (third image attached)
> 
> Hendrik Knaepen (a relative of Zeger Knaepen?): "increase emission from 
> 0.68 to 5" (fourth image attached).
> 
> Finally, Bob Hughes (yes, he already was around back then!): "adapt 
> emission color to flame color, replace spherical with onion media 
> pattern and decrease turbulence" (fifth image attached).
> 
> I rendered all "suggestion versions" with 3.1 on my laptop (did not try 
> them in 3.7 yet) - to me, Hendrik Knaepen's suggestion looks most 
> promising, I would lower the emission value to something like 3... what 
> do you think?
> 

I agree. To make the container less visible, I should also do something 
to the density. Concentrate the fire towards the centre and dim it 
towards the rim, using a spherical density map.


-- 
Thomas

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