Thank you Thomas and Bill for your comments. Yes, first the fire is to small and
second the sparks are a bit annoying. The sparks are my addition and I wanted
them look like the glowing logs of the fire, so I used the same texture. But I
will address this later.

And for ghosts: Yes Bill, if you will have a ghost like in ghostbusters one has
to use another approach. In this case Thomas approach is superior. But I fear
that using a spherical density works well with an object not very far away from
convexity - as Thomas has shown us - like a head but worse with a whole body.
Further ghosts are described in history in many forms. Take a look at the first
"photography" at

http://en.wikipedia.org/wiki/Ghost

That is more the kind of ghost I had in my mind. I tried such ghosts earlier
after your original approach but yielded some annoying white spots mainly at the
joints.

http://www.tc-rtc.co.uk/imagenewdisplay/stills/index395.html

(In the current scene you can see white spots at the armpits of the ghost, but
this are stars from the background by chance. With the next version I will have
rotated the stars away from this points.) With an df3 approach this should not
be possible (in theory).

BTW: the artefacts I considered as radiosity artefacts turned out to be a miss
scaled sky pigment producing this strange Moire effects. I never expected that,
but you will find the most stupid errors ever at last.

Here is the next version correcting the pigment error, exchanged the ground from
a badly scaled height_field to a mesh and rotated the stars out of the ghost.
Accidentally the new ground moved the randomly placed trees, but may be it is
better to have the ghost in front of a tree. The ghost is now scaled according
to Cousin Ricky's proposal, but it still looks younger as intended. The small
deformations of the arms and legs are due to a slight warp to the density and
not to the original MakeHuman figure.

Best regards,
Michael

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