"LanuHum" <Lan### [at] yandexru> wrote:
>
> Yes, df3 not the only way of creation of fire.
> In the Blender 249 for creation of very beautiful fire the system of particles
> was used.
> As particles the spheres animated on scale and post-processing were used by blur
> nodes
> Now it doesn't work in regular system of particles. The Blender has now no
> opportunity to animate a particle within its birth and death. I wrote in the
> exporter a code for realization of the old mechanism but how to add blur for
> Povray I too don't know

I'm not quiet sure if I understand all of your remarks correctly. And since I
have no idea about the particle System used by Blender my answer may be
erroneous completely.

First a voxel within a df3-file can contain only a color and if the color at the
border of the box described by the df3-file is not black which is density zero
you will see the bounding box. So if you use df3 here you must assure that the
fire is inside this box completely.

The particle system by Rune Johansen proposed by Stephen uses an other approach
to visualise fire. It has collected some dust during the years but the
visualisation part may be useful to you. Fortunatelly Rune's website
(runevision.com) is online again. His examples are quiet impressive even after
all the years. Personally I investigated the water part only, so for fire you
must study his solutions yourself. His particle system itself is a very simple
one and in fact not really worth to be called a particle system since the
particles doesn't interact with each other (which will be nearly impossible with
POV). They interact only with environmental objects. But his examples are still
impressive and in this situations the simple System works fine enough.

As I stated above I have no idea of the implementation of the particle system
used by Blender. Usually ons has rules for the birth and death of a particle but
I think you must not bother about such rules. At the specific stage of the
simulation you will depict only the living particles are of interest. And then
only their location (and color). The direction and velocity can be ignored since
this parameters are only important for the next step of the simulation of the
particle system and not to depict the actual situation.

BTW: Your example is hard to understand without the df3-file...

Hope we come to an understanding here, best regards,
Michael

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