Hello group, still working on my upcoming demo... (cannot shed details, it is a
rule of the demoscene ;... besides that's it is a model of a rocket launch)

So the fact is that i have to separate containers :

one simple sphere with a egg shape based on Mr Lohmueller flame media.
the other are two ellipsoids isosurface containers (to avoid clean bounding of
media at all costs) with scattering to simulate unclean exhaust...

In the axis of the <camera_pos> <look at> vector everything is nice and clean,
the  fumes get flashed away by the intense light of the clean exhaust and you
can see through. (by direct illumination from the emission media)

However at the sides there is probably an overlap of the two containers (do not
forget, different containers, different interiors and different media)
I get a nasty artefact of darkening/undarkening with a sometwhat cylindrcal
overprint.

so my question is : do i have to make absolutely sure that the two objects with
media do not overlap in space ?
Or is there any trick i am missing ?

PS : there is a point light inside the glowing exhaust : this in order to
magnify the shadow of the emission media without boosting the emission too much,
but it has the media_interaction off modifier (in order to make it less cpu
intensive)

I can provide some more data if necessary.

Have a nice day !

Rodrigo.

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